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Chinese characters to pinyin — with tone marks or numbers, supports simplified and traditional.

800+ everyday chengyu — pinyin, origin, usage.

Chinese classical poetry — 300+ hand-annotated Tang/Song/Yuan canon (唐诗宋词元曲) plus 80,000+ searchable Tang/Song/Shijing/Chuci poems on demand.

Chinese name generator — meaningful Chinese names with pinyin, meaning, and stroke count.

Chinese character stroke counter — count strokes for any hanzi, traditional or simplified.

Chengyu chain game with a 30,000+ idiom dictionary (full 汉语成语大词典 coverage). Start with any idiom; the computer continues with one whose first character matches your last.

Traditional ⇄ Simplified Chinese — fast, character-level, no API.

Five Elements (Wuxing) name recommender — based on Bazi gaps, suggest characters that balance the missing elements.

Handwriting practice sheet generator — Chinese 米字格 / 田字格 / 四线三格 (English) PDF-ready printable.

Hanyu Pinyin to Zhuyin ㄅㄆㄇㄈ both ways, tone marks ˊˇˋ˙, batch by space, copy in one click, runs in your browser

English vocabulary test — estimate your vocab size in 5 minutes, levels CET-4 / CET-6 / IELTS / TOEFL / GRE.

English grammar rules reference — 60+ core grammar rules with side-by-side examples, common mistakes, bilingual explanations.

English collocations reference — 200+ common verb + noun / adj + noun / verb + prep collocations with usage examples.

English irregular verbs reference — 200+ verbs with base / past / past participle, Chinese gloss, in-browser audio, pattern filter, and a flash-card practice mode.

HSK Chinese vocabulary test — estimate your Mandarin level (HSK 1-6) in 5 minutes with real exam words.

Turn singular English nouns into plurals and back, with irregulars, -ies, -ves and uncountables handled, all in your browser

Paste English text and get Flesch Reading Ease plus five grade-level scores, syllable counts, and reading time — runs entirely in your browser

Count syllables in any English word or text, with a 5-7-5 haiku mode for poems

Capitalize an English title the way editors do, AP / Chicago / APA / MLA, small words stay down, acronyms kept, runs in your browser

Arabic 1100 essential A1–A2 MSA words — Arabic script with full ḥarakāt, DIN 31635 romanization, gender, three-form verbs, audio TTS.

Dutch 500 essential A1–A2 words — IPA + de/het articles + 6-person conjugation + audio TTS.

1086 French entries — 1036 DELF A1-B2 core words plus 50 profession words. IPA, gender, Bescherelle conjugation (présent / passé composé / futur simple), free TTS, 17 categories.

German 500 essential words (A1-A2 + B1 core) with IPA, der/die/das, full Präsens, Präteritum, Perfekt, Partizip II for verbs, and browser TTS.

Hindi 1300 essential A1–A2 words — Devanagari, IAST, IPA, gender, -nā verbs, audio TTS.

Indonesian 500 essential A1–A2 words — KBBI spelling + Jakarta IPA + audio TTS. No tones, no conjugation.

Italian 500 essential words (A1-A2 Plida) with IPA, gender, full verb conjugation, audio TTS.

Japanese 500 essential words covering JLPT N5 and N4, with kana, romaji, kanji and audio TTS.

Korean 500 essential words spanning TOPIK I and TOPIK II — start speaking Korean today with Hangul, romanization, audio TTS, and full verb conjugations.

Portuguese 500 essential words — A1 to A2 Brazilian Portuguese, with IPA, gender, conjugation, audio TTS.

Russian 500 essential words covering the full TORFL A1-A2 syllabus, with Cyrillic, stress marks, BGN/PCGN romanization, gender, full verb conjugation, and audio TTS.

Spanish 500 essential A1–A2 words — start speaking Spanish today, with pronunciation, example sentences, verb conjugations and audio TTS.

Thai 500 essential A1–A2 words — Thai script + RTGS + IPA + 5 tones + audio TTS.

Turkish 500 essential A1–A2 words — Istanbul standard + IPA + vowel harmony + audio TTS.

Vietnamese 500 essential A1–A2 words — chữ Quốc ngữ + IPA + 6 tones + audio TTS.

Headline analyzer — score your title's clickability, SEO length, emotional words, power words.

Slogan generator — 30+ proven copywriting formulas, generate brand slogans in seconds, bilingual.

Hashtag generator — Instagram / TikTok / Twitter / Xiaohongshu / Weibo hashtags from your topic.

Cover letter generator — fill 6 fields, pick a tone, get a tailored cover letter in 4 templates, bilingual.

Resume template builder — fill a form, get a clean PDF resume in 3 templates (modern / classic / minimal), bilingual.

Interview questions bank — 300+ real questions across behavioral / technical / case / culture, with strong answer frameworks.

200+ prompt templates for ChatGPT, Claude, Gemini — copy-paste, browse by use case.

Turn role, task, constraints, and output rules into a structured system prompt you can copy.

Generate eval cases, pass criteria, and edge cases from an AI feature, risks, and user path.

AI model comparison — 20+ models (GPT / Claude / Gemini / Llama / Qwen) across price, context, speed, capabilities (2026).

AI token counter — estimate token count for GPT / Claude / Gemini, with per-model cost calculator (2026 pricing).

Generate a prioritized content refresh checklist from URL, topic, and performance signals.

Generate SEO meta description options from a page topic, keywords, and audience.

Score a YouTube title for clarity, specificity, length, and keyword position.

Weekly report generator — fill blanks, get clean markdown, no AI hallucination.

Random names from 11 cultures — Chinese, English, Japanese, Korean, Arabic, Russian + 5 European.

Classic Lorem Ipsum filler text — paragraphs, sentences, or words — copy in one click, browser-only

Turn plain text into ｗｉｄｅ fullwidth vaporwave letters, spaced-out aesthetic, or fold it back to normal — one click to copy, runs in your browser

Check if two words are anagrams, rearrange a set of letters into every ordering, and read the sorted letter fingerprint, all in your browser

Turn plain text into 25 Unicode styles — bold, italic, script, fraktur, double-struck, circled, squared, fullwidth, upside-down, small caps, strikethrough — copy & paste anywhere, browser-only

Turn a short word into a big ASCII letter banner with three built-in fonts, all in your browser

Paste three lines, see 5-7-5 syllable counts per line, with off-pattern lines flagged — English heuristic, browser-only

Copy blank-looking text made of real invisible Unicode for empty messages, blank usernames and placeholders, browser-only

Turn plain text into 1337 and back, three strength levels, all in your browser

Turn words into looking-glass text — each letter flipped (b↔d, e→ɘ, R→Я) and the line reversed — browser-only, one-click copy

English to Pig Latin and back, in your browser. pig becomes igpay, egg becomes eggway, with case and punctuation kept.

Turn English into Elder Futhark runes and read runes back into letters, right in your browser

Turn plain text into ꜱᴍᴀʟʟ ᴄᴀᴘs, real Unicode you can paste into an Instagram bio, Discord or X, one click to copy

Turn x2 into x², H2O into H₂O — real Unicode you can paste into Instagram, a spreadsheet or a video title, no rich text needed

Wrap text in single, double, rounded, bold, ascii or stars boxes with CJK-aware alignment, padding and a title row, all in your browser

Jumble the letters in any word, check if two words are anagrams, or list every ordering of a short word, all in your browser

Glitch your words into cursed, dripping Zalgo text with combining marks, then strip it clean in one tap, all in the browser

Compare two blocks of text — line-by-line additions, deletions, equal — colour highlighted, browser-only

Remove duplicate lines from any list — case-sensitive optional, whitespace-trim optional, count duplicates — browser-only

Sort lines alphabetically, naturally (file2 < file10), numerically, by length — locale-aware — browser-only

Count words, characters, sentences, paragraphs and reading time in any text — instant, browser-only

Convert text between camelCase, snake_case, kebab-case, PascalCase, Title Case, UPPER, lower — instant, browser-only

Test JavaScript regex live — match highlighting, group capture, replace preview, flag toggles — browser-only

Turn any title into a clean URL slug — lowercase, dashes, ASCII-safe transliteration, multiline batch — browser-only

Validate emails — RFC 5321 syntax + bulk paste + disposable detection + MX hint.

ROT13 / ROT47 / Caesar cipher — encode and decode in your browser, instant.

Text to binary (and back) — UTF-8 aware, 8/16/32 bit grouping, emoji safe.

Text to Morse code and back — encode, decode, audio playback, ITU standard.

Encode/decode HTML entities — &amp; &lt; &gt; &quot; &#39; and all numeric refs — browser-only

Convert Markdown to clean HTML — headings, lists, code, links, images, tables — instant live preview, browser-only

Markdown editor with live split-pane preview — GFM tables, fenced code with syntax highlight, math, emoji, table of contents, export as HTML / PDF-ready.

Build Markdown tables visually — add/remove rows, column alignment, paste from Excel / CSV — browser-only

Image to ASCII art — convert any image to text-based art with adjustable density and character set.

Generate ASCII art from text — figlet-style banners, multiple fonts.

Clean noisy logs by removing timestamps, ANSI colors, blank lines, long lines, or non-error entries in your browser.

Validate JSONL line by line, pretty-print it, convert to a JSON array, or export a CSV-like table locally.

JSONPath / JMESPath query tester — paste JSON, write a path, see matched values + matched paths highlighted live.

Paste JSON or NDJSON samples and infer a Draft 2020-12 style schema with types, required fields, formats, enums, and examples.

GraphQL formatter + minifier — beautify query/mutation/subscription/schema, validate syntax, copy minified single-line for HTTP body.

.env file validator — parse Bash-style .env, detect dups / missing required / unsafe values / leaked secret patterns; cross-compare prod / staging / dev envs.

Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.

LaTeX equation editor live — type/paste LaTeX, see math rendered live via MathJax 3 (CDN), copy as SVG/PNG/Markdown/MathML, 30+ symbol palette.

Kanji + Chinese character stroke order viewer — animated SVG showing correct stroke sequence + direction, with romaji/pinyin/meaning, 500+ common characters.

Paste logs and group repeated errors, warnings, stack traces, HTTP statuses, endpoint patterns, and time ranges into a local incident report.

A=1, B=2 … Z=26 — encode text to numbers or decode numbers to text, pick hyphen / space / comma separators, one-click copy — browser-only

Number every line of pasted text — set start, step and separator, zero-pad to align, skip blanks, or strip numbers back off — browser-only

Bold the leading letters of every word — live preview, adjustable strength, export HTML — 100% in-browser

Type text and read it back as Unicode braille dots, or paste braille to recover the letters, all in your browser

Count how often every character appears, ranked by frequency, with case, space and punctuation toggles, browser-only

Pad delimited rows into an even monospace grid, like column -t, with correct CJK width — browser-only

Strip every emoji from text, family and skin-tone combos removed whole, your words and punctuation left untouched, browser-only

Batch find-and-replace on big text — regex, $1 capture groups, whole-word, case toggle, multiple chained rules — runs entirely in your browser

Strip Markdown to clean plain text — headings, bold, links, code, lists, tables, HTML all flattened — browser-only

Text to Alpha Bravo Charlie and back — spell anything aloud over the phone or radio, no mishearing.

Tells you if text reads the same backwards, finds the longest palindrome inside, handles Chinese and emoji, runs in your browser

Turn letters into Masonic grid-and-X symbols, drawn live as SVG, with a plain-text key so you can decode it back, browser-only

Paste text, get an accurate "X min read" plus a separate speaking time — counts CJK by character and English by word, all in your browser

Strip diacritics from Latin text, café to cafe, ñ to n, ß to ss, runs entirely in your browser

Strip or replace line breaks, join wrapped lines into running text — keep-paragraphs mode, CRLF/CR/LF normalize, live preview — browser-only

Reverse text by character, word or line, flip each word, or turn writing upside down — Unicode and emoji safe, runs in your browser

Text to flag semaphore and back, two flag angles per letter with a drawn signaller, numeric sign for digits, runs only in your browser

Straight quotes to curly quotes and back, with smart apostrophes, en and em dashes, and ellipsis, all in your browser

Count characters against real X, Instagram, Weibo, LinkedIn, TikTok and SMS limits as you type, all in your browser

Levenshtein edit distance, Dice, Jaro-Winkler and LCS side by side, with a 0-100% match score, all in your browser

Paste HTML source, get clean plain text. Block tags become line breaks, entities decode, allow-list keeps chosen tags, script content gets removed — all in your browser.

Repeat any text N times with newline, space, comma or custom separators, optional numbering and a wrap, browser-only

Read any text aloud with your browser's built-in voices — pick voice, speed, pitch, volume — 100% local, nothing uploaded

Hard-wrap text at any column width, by word or by character, with optional line prefix, all in your browser

Inspect any text character-by-character: code points, UTF-8/UTF-16 bytes, HTML entities, JS escapes, names, and hidden zero-width / confusable glyphs.

Normalize text to NFC, NFD, NFKC or NFKD, see code-point and byte counts shift, spot which characters changed, copy in one click, all in your browser

Turn my-blog-post, user_first_name and parseHTMLContent back into readable text, browser-only

Rank every word + phrase by frequency, with keyword density, stop-word filtering, and n-gram analysis — browser-only

Solve any of words, minutes, and WPM — paste a speech to estimate read-aloud time, with speaking-rate presets and one-click copy — browser-only

Find and strip zero-width spaces, the BOM, no-break spaces and other invisible characters, then copy clean text — runs in your browser

Extract, dedupe, and export email addresses from pasted text or uploaded local files.

Validate and explain issues in email addresses from pasted text or uploaded local files.

Normalize, sort, and prepare email addresses from pasted text or uploaded local files.

Find duplicates and keep one clean copy of email addresses from pasted text or uploaded local files.

Convert email addresses from pasted text or uploaded local files.

Extract, dedupe, and export urls from pasted text or uploaded local files.

Validate and explain issues in urls from pasted text or uploaded local files.

Normalize, sort, and prepare urls from pasted text or uploaded local files.

Find duplicates and keep one clean copy of urls from pasted text or uploaded local files.

Convert urls from pasted text or uploaded local files.

Extract, dedupe, and export domain names from pasted text or uploaded local files.

Validate and explain issues in domain names from pasted text or uploaded local files.

Normalize, sort, and prepare domain names from pasted text or uploaded local files.

Find duplicates and keep one clean copy of domain names from pasted text or uploaded local files.

Convert domain names from pasted text or uploaded local files.

Extract, dedupe, and export ipv4 addresses from pasted text or uploaded local files.

Validate and explain issues in ipv4 addresses from pasted text or uploaded local files.

Normalize, sort, and prepare ipv4 addresses from pasted text or uploaded local files.

Find duplicates and keep one clean copy of ipv4 addresses from pasted text or uploaded local files.

Convert ipv4 addresses from pasted text or uploaded local files.

Extract, dedupe, and export ipv6 addresses from pasted text or uploaded local files.

Validate and explain issues in ipv6 addresses from pasted text or uploaded local files.

Normalize, sort, and prepare ipv6 addresses from pasted text or uploaded local files.

Find duplicates and keep one clean copy of ipv6 addresses from pasted text or uploaded local files.

Convert ipv6 addresses from pasted text or uploaded local files.

Extract, dedupe, and export uuids from pasted text or uploaded local files.

Validate and explain issues in uuids from pasted text or uploaded local files.

Normalize, sort, and prepare uuids from pasted text or uploaded local files.

Find duplicates and keep one clean copy of uuids from pasted text or uploaded local files.

Convert uuids from pasted text or uploaded local files.

Extract, dedupe, and export hashtags from pasted text or uploaded local files.

Validate and explain issues in hashtags from pasted text or uploaded local files.

Normalize, sort, and prepare hashtags from pasted text or uploaded local files.

Find duplicates and keep one clean copy of hashtags from pasted text or uploaded local files.

Convert hashtags from pasted text or uploaded local files.

Extract, dedupe, and export social handles from pasted text or uploaded local files.

Validate and explain issues in social handles from pasted text or uploaded local files.

Normalize, sort, and prepare social handles from pasted text or uploaded local files.

Find duplicates and keep one clean copy of social handles from pasted text or uploaded local files.

Convert social handles from pasted text or uploaded local files.

Extract, dedupe, and export phone numbers from pasted text or uploaded local files.

Validate and explain issues in phone numbers from pasted text or uploaded local files.

Normalize, sort, and prepare phone numbers from pasted text or uploaded local files.

Find duplicates and keep one clean copy of phone numbers from pasted text or uploaded local files.

Convert phone numbers from pasted text or uploaded local files.

Extract, dedupe, and export postal codes from pasted text or uploaded local files.

Validate and explain issues in postal codes from pasted text or uploaded local files.

Normalize, sort, and prepare postal codes from pasted text or uploaded local files.

Find duplicates and keep one clean copy of postal codes from pasted text or uploaded local files.

Convert postal codes from pasted text or uploaded local files.

Extract, dedupe, and export credit card numbers from pasted text or uploaded local files.

Validate and explain issues in credit card numbers from pasted text or uploaded local files.

Normalize, sort, and prepare credit card numbers from pasted text or uploaded local files.

Find duplicates and keep one clean copy of credit card numbers from pasted text or uploaded local files.

Convert credit card numbers from pasted text or uploaded local files.

Extract, dedupe, and export hex colors from pasted text or uploaded local files.

Validate and explain issues in hex colors from pasted text or uploaded local files.

Normalize, sort, and prepare hex colors from pasted text or uploaded local files.

Find duplicates and keep one clean copy of hex colors from pasted text or uploaded local files.

Convert hex colors from pasted text or uploaded local files.

Extract, dedupe, and export css variables from pasted text or uploaded local files.

Validate and explain issues in css variables from pasted text or uploaded local files.

Normalize, sort, and prepare css variables from pasted text or uploaded local files.

Find duplicates and keep one clean copy of css variables from pasted text or uploaded local files.

Convert css variables from pasted text or uploaded local files.

Extract, dedupe, and export environment variables from pasted text or uploaded local files.

Validate and explain issues in environment variables from pasted text or uploaded local files.

Normalize, sort, and prepare environment variables from pasted text or uploaded local files.

Find duplicates and keep one clean copy of environment variables from pasted text or uploaded local files.

Convert environment variables from pasted text or uploaded local files.

Extract, dedupe, and export http headers from pasted text or uploaded local files.

Validate and explain issues in http headers from pasted text or uploaded local files.

Normalize, sort, and prepare http headers from pasted text or uploaded local files.

Find duplicates and keep one clean copy of http headers from pasted text or uploaded local files.

Convert http headers from pasted text or uploaded local files.

Extract, dedupe, and export jwt tokens from pasted text or uploaded local files.

Validate and explain issues in jwt tokens from pasted text or uploaded local files.

Normalize, sort, and prepare jwt tokens from pasted text or uploaded local files.

Find duplicates and keep one clean copy of jwt tokens from pasted text or uploaded local files.

Convert jwt tokens from pasted text or uploaded local files.

Extract, dedupe, and export base64 blocks from pasted text or uploaded local files.

Validate and explain issues in base64 blocks from pasted text or uploaded local files.

Normalize, sort, and prepare base64 blocks from pasted text or uploaded local files.

Find duplicates and keep one clean copy of base64 blocks from pasted text or uploaded local files.

Convert base64 blocks from pasted text or uploaded local files.

Extract, dedupe, and export iso dates from pasted text or uploaded local files.

Validate and explain issues in iso dates from pasted text or uploaded local files.

Normalize, sort, and prepare iso dates from pasted text or uploaded local files.

Find duplicates and keep one clean copy of iso dates from pasted text or uploaded local files.

Convert iso dates from pasted text or uploaded local files.

Extract, dedupe, and export semantic versions from pasted text or uploaded local files.

Validate and explain issues in semantic versions from pasted text or uploaded local files.

Normalize, sort, and prepare semantic versions from pasted text or uploaded local files.

Find duplicates and keep one clean copy of semantic versions from pasted text or uploaded local files.

Convert semantic versions from pasted text or uploaded local files.

Extract, dedupe, and export mac addresses from pasted text or uploaded local files.

Validate and explain issues in mac addresses from pasted text or uploaded local files.

Normalize, sort, and prepare mac addresses from pasted text or uploaded local files.

Find duplicates and keep one clean copy of mac addresses from pasted text or uploaded local files.

Convert mac addresses from pasted text or uploaded local files.

Extract, dedupe, and export dois from pasted text or uploaded local files.

Validate and explain issues in dois from pasted text or uploaded local files.

Normalize, sort, and prepare dois from pasted text or uploaded local files.

Find duplicates and keep one clean copy of dois from pasted text or uploaded local files.

Convert dois from pasted text or uploaded local files.

Compare two lists line by line: only in A, only in B, in both, and merged — all in your browser

Shuffle a list, pick N at random, split into K teams, or draw one winner — fair crypto randomness, browser-only

Turn a column of lines into a comma-separated string — add quotes, prefix/suffix, dedupe, sort, or split it back — browser-only

Pull every number out of any text: integers, decimals, negatives, 1,234 commas, percents and 6.02e23, with instant sum and average

Paste a list, pick N lines at random with crypto-grade fairness, draw raffle winners, copy in one click, all in your browser

Cat breed finder — answer 10 lifestyle questions, get 5 matching cat breeds with personality, grooming needs, friendliness.

Dog breed finder — answer 10 questions about your lifestyle, get 5 matching breeds with size, temperament, exercise needs.

Dream dictionary — search dream symbols and meanings (Chinese 周公解梦 + Jungian).

Palmistry guide — 6 major lines + 7 mounts explained with diagrams, traditional readings, bilingual.

200+ meridian acupoints / WHO 2008 standard locations / with contraindications, manipulation, and combinations.

Yoga pose library — 60+ asanas with Sanskrit + Chinese + English names, benefits, contraindications, modifications.

Unicode 15.1 / 1500+ emojis with bilingual search — one-click copy, browser-only

Emoji recommender — paste your headline or post, get matching emoji suggestions.

Daily fortune cookie — bilingual fortunes plus lucky numbers, lucky color, daily affirmation. 365 unique reads.

MBTI quick test — 28 questions, 5 minutes, get your 4-letter type with detailed reading.

College major matcher — Holland code (RIASEC) test, 40 questions, recommend 10+ matching majors with career path.

Capo on fret N raises every chord N semitones, find the sounding chord or the easy shape to play, suffixes kept

Interactive circle of fifths, click any major key for its key signature, relative minor, scale and dominant

Browse 120+ Japanese emoticons by mood, search in English, click to copy the shrug ¯\_(ツ)_/¯ and friends

Move a whole progression up or down by semitones or to any key, suffix and slash bass kept, sharp or flat your call

Chords to numbers and back in any key — 1 4 5 6m, slash bass, 7/maj7 suffixes kept, one-click copy — browser-only

Type a word, get its Scrabble tile value, with double/triple letter and word premiums and blank tiles, all in the browser

awk + sed cheat sheet — 80+ one-liners for text processing, with real examples and common pitfalls.

AWS CLI cheat sheet — 80+ commands for EC2 / S3 / IAM / Lambda / RDS / EKS / CloudFormation with real examples.

Bash cheat sheet — 100+ commands & idioms for variables, conditionals, loops, functions, pipes, traps, with real one-liners.

curl cheat sheet — 80+ curl commands for GET/POST/auth/upload/download/SSL/proxy, with real examples and pitfalls.

DNS record explainer — all 18 common record types (A, AAAA, CNAME, MX, TXT, SRV, etc.) with syntax, examples, and gotchas.

Docker command cheat sheet — 80+ commands with real examples, common mistakes, and Compose section.

Elasticsearch cheat sheet — 80+ Query DSL, mapping, analyzer, aggregation, replication, with real examples.

Git command cheat sheet — searchable, with explanations, common mistakes, and real examples.

Go (Golang) cheat sheet — 100+ idiomatic snippets covering syntax, goroutines, channels, generics, errors, stdlib.

HTTP status code explorer — all 70+ codes with meaning, common causes, real examples, and what to check.

kubectl cheat sheet — 100+ Kubernetes commands with real examples, common pitfalls, and YAML snippets.

Markdown syntax cheat sheet — every rule with live preview side by side, GFM + flavors.

MongoDB cheat sheet — 80+ shell commands & query operators for CRUD, aggregation, indexing, replication.

Next.js 15 cheat sheet — App Router, Server Components, Server Actions, dynamic routes, with examples and pitfalls.

Nginx cheat sheet — common configs, location/server blocks, SSL, reverse proxy, gzip, real examples & gotchas.

npm / yarn / pnpm cheat sheet — 80+ commands across init, install, scripts, publish, with cross-tool comparison.

Password leak checker — check if your password has been seen in known breaches using k-anonymity (HIBP API style), the password never leaves your browser.

PostgreSQL cheat sheet — 80+ commands & functions for psql, JSONB, CTEs, window functions, indexing, partitioning, advanced extensions.

Python cheat sheet — 100+ idiomatic Python snippets for string, list, dict, file, async, with real examples.

React hooks cheat sheet — all 17 built-in hooks (useState / useEffect / useMemo / useTransition / useFormStatus...) with real examples and pitfalls.

Redis cheat sheet — 80+ commands across strings, hashes, lists, sets, sorted sets, pub/sub, streams, scripts, with examples and pitfalls.

Interactive regex cheat sheet — quick reference for every flavor (JS, Python, PCRE).

Rust cheat sheet — 100+ snippets covering ownership, borrowing, lifetimes, traits, async, error handling.

SQL cheat sheet — 100+ statements covering SELECT, JOIN, window functions, indexing, MySQL/PostgreSQL/SQLite differences.

Svelte 5 cheat sheet — runes ($state, $derived, $effect), snippets, props, stores, with Svelte 4 comparison.

Tailwind CSS cheat sheet — 100+ utility classes (spacing, color, flex, grid, typography, responsive) with live preview.

TypeScript cheat sheet — 100+ snippets for types, generics, utility types, narrowing, async patterns.

Vim cheat sheet — 100+ commands covering modes, motions, edits, search, registers, splits, with mnemonics.

Vue 3 cheat sheet — Composition API, reactivity, components, directives, Pinia, with side-by-side Options API comparison.

Verify every element of your ad before launch — headline, CTA, compliance, and technical setup

25 fill-in-the-blank AI prompts for contract drafting, NDA review, legal research, employment law, and IP

Template-driven prompt generator for lesson plans, formative quizzes, and rubrics — by grade level and subject.

Apache HTTP Server cheatsheet for httpd.conf, VirtualHost, .htaccess, mod_rewrite, SSL, proxying, auth, headers, and logs.

Paste CSV or TSV, get a monospace table that lines up: +--+ ASCII, Unicode box, Markdown, with real CJK width

Complete 0–127 ASCII table: decimal, hex, octal, binary, character, name, HTML entity and escape — control codes explained, click to copy, fully searchable.

AWS S3 cheat sheet — 58+ commands covering buckets, sync, presign, versioning, lifecycle, encryption, CORS, and multipart.

Chemistry equation balancer — paste an unbalanced equation, solve coefficients using the matrix method, show step-by-step.

China gaokao major recommender 2026 — filter by score range + subject combo (3+1+2) + interest + employment outlook, 150+ undergrad majors across 12 disciplines.

Han-character placeholder text that fills a column the way real Chinese copy will, three styles, browser-only

Chinese lunar almanac (huangli) — daily 宜/忌 advice, 24 solar terms, 干支/生肖, auspicious hours, any date 1900-2100.

Verify every element of your cold email before hitting send — subject line, personalization, CTA, and deliverability

Turn an indented file list into a clean ASCII folder tree with box-drawing guides, choose Unicode or ASCII, then copy it into any README, browser-only

Transcribe DNA to mRNA, build the reverse complement, translate codons to protein — standard genetic code, browser-only

Emoji ⇄ Unicode code points, both ways. U+XXXX, decimal, HTML entity, JS and CSS escapes, every code point of a ZWJ family, skin tone or flag, plus one-click restore, all in your browser

Strip illegal characters and make any string a safe cross-platform filename, in your browser

Paste a DNA or RNA sequence and get GC%, AT%, per-base counts, length and a melting-temperature estimate. FASTA headers and spaces are ignored, invalid bases flagged, all in your browser.

Encode & decode all HTML5 entities — named, decimal, hex — XSS prevention and safe markup, 100% client-side

Math formula reference — algebra, geometry, trigonometry, calculus, statistics, all in one place.

MIDI number ⇄ note name ⇄ frequency — note 60 is middle C, A4 = 440 Hz, cents off, C3/C4 toggle — browser-only

Type a name, get an etiquette-correct monogram — traditional surname-in-centre or modern equal-size, circle/square/diamond frame, copy or download the SVG — browser-only

Netlify _redirects and netlify.toml cheatsheet for rewrites, proxies, SPA fallbacks, splats, status codes, and country/language rules.

One number in, every format out: thousands grouping, currency, percent, scientific, engineering, compact (K/M/万), ordinal, byte size — plus reverse parsing. 100% browser-only.

Spell any number in English — cheque amounts, ordinals, British vs American "and" — 100% browser-only

Cardinal to ordinal both ways: 1st 2nd 3rd suffixes, twenty-first words, plus Chinese 第N, single or batch, copy ready

Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.

Arabic ⇄ Roman, both directions, live — strict validation, step-by-step breakdown, vinculum up to 3,999,999 — 100% browser-only

Convert tabs to spaces and spaces to tabs, real tab-stop alignment, leading-indent or whole-line, all in your browser

Number to tally marks and back, in Unicode, the five-bar gate, or Chinese 正, with one-click copy, all in your browser

Paste text → get a per-code-point table: U+XXXX, UTF-8 bytes, UTF-16, HTML entity, JS escape, character name.

Inspect code points, names, categories, UTF-8 bytes and normalize text to NFC, NFD, NFKC or NFKD entirely in your browser.

Count UTF-8 bytes, UTF-16 code units, Unicode code points and characters in any string, right in your browser

See every space, tab, newline and hidden character — middle-dot spaces, arrow tabs, pilcrow line breaks, trailing-space highlight, browser-only