
電車でタイピング|駅名で楽しく続ける無料タイピング練習サイト
Free typing practice using real Japanese train station names across themed routes.
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Free typing practice using real Japanese train station names across themed routes.

Instantly transform rough thoughts into professional replies.
@anandkumar_dev · X

Generate Gmail replies in your personal writing voice using AI trained on your emails.
u/Sea_Visual9618 · Reddit
I fed an AI 12,000 of my sent emails to clone my writing voice. My cofounder couldn't tell which replies were mine. Bit of background: I've spent ~2 hours a day in Gmail for the last two years, and almost none of it was thinking. It was re-typing the same six replies. So the side project started as a dumb question: if I gave a model every email I'd ever sent, could it write like me? Not "professional email tone" — me. The lowercase, the "sounds good, will do by fri," the fact

A browser extension suggesting X replies in your unique voice and tone.
@kekkodamato_ · X
Working on -- a browser extension that helps you write better replies on X. Built for anyone who spends time engaging here but wants their replies to actually land.

A dark fantasy browser game in pre-alpha development.
@grimwalkerSM · X
CODES ON MY PROFILE

Interactive tool to solve Gothic Remake lock puzzles with diagrams and solution playback.
@rychorus1 · X
Just launched: Mini-map feature in After executing all the lock solution steps, a mini-map will show on-screen (except if you're already on the map screen). The mini map shows the current and nearby locks #GothicRemake #WorldOfGothic #BuildInPublic

A daily puzzle game where you spot AI-generated errors to sharpen critical thinking.
u/CogniKing · Reddit
Play Parry — a 2-minute daily puzzle about catching AI's mistakes: spot the planted flaw, catch the answer that's lying to you I have been recently fascinated with puzzles as a way to help improve my BS-radar when using AI. I designed Parry to help with this - One puzzle a day - find the one flaw hidden in a confident paragraph, pick which of two AI answers actually helps you (one is subtly useless), call a claim true/false. Free, no account, nothing you input leaves your devi

QuizCraft Turn your notes into flashcards + quizzes instantly with AI
diane_piedoux · Product Hunt
QuizCraft Turn your notes into flashcards + quizzes instantly with AI

Practice system design by submitting architectures and experiencing AI-triggered production incidents.
u/No-Preference-846 · Reddit
I built an AI-augmented system design practice tool that triggers a live production incident when you submit your design - not just a critique Every system design prep resource I used was static — read a diagram, read the tradeoffs, move to the next one. Nothing ever pushed back on what I actually built. So I built ChaosBench . You design a system on a canvas — drag components, wire them up — and when you submit it, an LLM (Gemini) finds the actual weak point in your specific design and

Markdown documentation framework with integrated AI chat assistant for answering questions.
u/jm_ka · Reddit
SmartDocs - open-source docs framework with AI chat; just add your API key. SmartDocs is an open-source Markdown documentation with built-in AI chat. The pitch: write docs in Markdown, add your API key to .env, and every page gets a grounded AI assistant. Self-hosted, your data, your control. Tech: Next.js + Markdoc + Tailwind. No vector DB — uses graph-backed retrieval (keyword scoring + link traversal) inspired by Karpathy's LLM Wiki pattern. Live demo (no key needed): https://www.ge

Transform AI-generated text into natural-sounding human writing.
Humanizadordeia.app — 将AI文本转化为自然人类写作。1)人性化处理,让 AI 文本更自然、更贴近人工写作与品牌口吻;2)检测服务,帮助识别潜在 AI 生成内容,提升合规与质量。支持多语种、极速处理、保留语义与风格。免注册体验 300 字,适合博主、营销团队、跨境站点、教育与企业内容运营。以先进模型(GPT、Claude、Gemini 等)驱动。

Rephrase a twelve-word sentence in exactly five words using only its words.
u/Mastbubbles · Reddit
Long Story Short, a daily word game where you rephrase a 12-word sentence in exactly 5 of its words Hi, I made this one. I've played Wordle-likes for years and always wanted to build my own, but I never had an idea that felt like mine. The push came from a strange place. Half of what I read these days is written by AI, and it's never short. Every email, every doc, twelve words where five would do. At some point I said the phrase out loud, long story short, and realised it was