Built 90 browser tools in 115 days. All zero-upload. Am I crazy?
Hey PH community, solo dev here.
115 days ago I built my first tool โ a PDF compressor. One rule:
the user's file never leaves their device. No uploads, ever.
That obsession snowballed. 115 days later, 90 tools across 10 categories:
๐น PDF: compress, merge, convert, extract
๐น Image: 19 tools, AI background remover, crop, resize
Video: compress, GIF maker, screenshot, audio extract
๐น Audio: format conversion, metronome, BPM detector
Text: fancy fonts, Morse code, JSON formatter, diff
๐น Creative: whiteboard, QR codes, pixel art, signature maker
๐น AI: Tarot, Text Adventure, Life Trajectory, Ex-Partner Chat
๐น Self-test: typing speed, reaction time, CPS, aim trainer
Everything runs in-browser via WebAssembly. Zero uploads. Zero accounts. Zero tracking.
People tell me I'm stubborn โ "who builds pure client-side tools in 2026? SaaS is the way."
But I believe some tools should just work: open, use, close. No traces left behind.
Site: toolknit.com
Would love your thoughts:
1. Do "use-and-leave" tools still have a place in 2026?
2. If you could request one tool, what would it be? I might build it this week.
3. 115 days in โ should I add a paid tier, or keep it all free?
Roast me, request features, tell me I'm wrong. All welcome.
Replies
not crazy, that constraint is the whole product. we build on-device too (voice, nothing uploaded) and it forces better engineering, you can't paper over a slow model with a server. on the paid tier question: charge for the ones that need real compute (video, AI stuff) and keep the pure client-side utilities free forever, that split matches the trust story you're selling.