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董子航left a comment
Hey Product Hunt! 👋 I built RewriteEmail because I was tired of spending 20+ minutes crafting important emails — salary negotiations, client complaints, cold outreach. ChatGPT works for general writing, but emails have unique rules: tone matters more than grammar, timing affects open rates, and one wrong sentence can kill a deal. So I built a tool that's 100% focused on email. Paste your draft,...
RewriteEmailTurn weak emails into winning negotiations with AI
RewriteEmail is a free AI email rewriting tool for professionals.
Paste your rough draft → get a polished rewrite in 30 seconds.
🎯 Why it's different from ChatGPT:
- Purpose-built for email tone, urgency & persuasion
- Full strategy diagnosis, not just grammar fixes
- Best send timing recommendations
- Follow-up coaching when you get a reply
- Supports 7 languages
Perfect for negotiations, complaints, cold outreach & job applications.
Free to start (3 rewrites, no signup). Premium: $7.90/mo.
RewriteEmailTurn weak emails into winning negotiations with AI
董子航left a comment
Hey Product Hunt! 👋 I built OohSleep because I was frustrated with sleep apps that: ❌ Cost $50+/year for basic features ❌ Upload your personal sleep data to servers ❌ Require app store downloads and accounts So I built a free alternative as a PWA that: ✅ Works in any browser, installs to home screen ✅ Keeps ALL data on your device (zero server uploads) ✅ Uses AI to analyze your sleep patterns ✅...
OohSleep — Sleep Better, FreeFree AI sleep tracker with snoring detection — works offline
AI Sleep Analysis — Get personalized insights powered by DeepSeek AI
Snoring Detection — Records and identifies snoring patterns while you sleep
10 Ambient Sounds — Rain, ocean, forest, thunder & more with smart mixing
Breathing Exercises — 4-7-8, box breathing & guided techniques to fall asleep faster
Sleep Statistics — Track trends with weekly/monthly charts
Works Offline — Install as PWA, works without internet
100% Private — All data stays on your device, nothing uploaded
OohSleep — Sleep Better, FreeFree AI sleep tracker with snoring detection — works offline
董子航left a comment
Hey Product Hunt! 👋 I built ToolKnit because I was frustrated with "free" online tools that: 1. Upload your files to unknown servers 2. Force you to create an account 3. Slap watermarks on the output 4. Limit you to 1-2 free uses per day Every tool on ToolKnit runs 100% in your browser using WebAssembly and Canvas APIs. Your files literally never leave your computer. Our newest addition is a...
28+ free browser tools — no uploads, 100% private
董子航started a discussion
28+ free browser tools — no uploads, 100% private
ToolKnit is a free, all-in-one online toolbox with 28+ tools that run entirely in your browser. No files are ever uploaded to any server. 🔧 What's inside: - PDF: Compress, merge, split, convert to/from Word & images - Image: Format conversion (JPG, PNG, WebP), compress, crop, grid split - Video: Compress video, convert video clips to GIF - Audio: MP3 ↔ WAV conversion - Creative: Whiteboard,...
董子航left a comment
Hi there, I'm Mr.Dong — the chief code wrangler behind ToolKnit 👋 Back in March 2026, I was up late at night, ranting at my keyboard again. Tired of bloated online tools that bombarded you with 30-second ads, hid malware in "free" downloads, and took forever to load just to compress a PDF… I thought: Why not build something better? Clean, fast, totally free — and maybe, just maybe, use some SEO...
ToolKnitAll - in - one tools for digital file needs
ToolKnit offers 25+ free browser-based tools: compress & crop images, PDF to Word, Word to PDF, convert audio (MP3, WAV), whiteboard drawing, meal picker, fortune oracle, character counter, stopwatch, countdown timer and more. 100% private — no uploads, no servers.
ToolKnitAll - in - one tools for digital file needs