A knowledge tool shouldn't feel like a database. PaperCache is designed for the temporary, the messy, and the in-between. It spawns when you need it, vanishes when you're done, and gets out of your way.
PaperCache is active. It evaluates your math in real-time, queries AI inline, links your notes automatically, and visualizes your knowledge graph. Your notes should work for you, not just store your words.
If a tool slows you down, you won't use it. That's why PaperCache:
- Spawns exactly where your mouse cursor is
- Uses 0% CPU when idle
- Hides markdown syntax when you aren't editing
- Vanishes the moment you click away
You don't just write prose; you write code, equations, and structured data. PaperCache includes features like:
- Reactive variables (
/var x = 5) - Inline AI with context injection (
/ctx) - Implicit folder organization (
projects/PaperCache.md) - Knowledge graph visualization
I saw a really cool app called Antinote, but it was locked behind a paywall. I wanted something just as good that was open source and could fit my own specific needs, so I built PaperCache to match it. It solved my problem perfectly, and since other people probably have the exact same needs, I made it completely free and open for everyone to use, fork, and improve.
- 100% free (no "Pro" tier, no feature gating)
- Open source (audit the code, contribute, fork it)
- Local first (your data never leaves your machine)
PaperCache integrates AI inline, where you're already working:
- Type
/ai <prompt>and get an answer right in your document - Use
/ctx <prompt>to automatically include your entire note as context - Your API keys are encrypted securely locally.
PaperCache makes specific, intentional choices:
- No complex plugin system
- No cloud sync (your data is yours)
- No WYSIWYG editor (raw text speed with rendered readability)
PaperCache is a simple, polished tool built by a developer to solve a personal need. It's the floating knowledge manager I always wanted but didn't want to pay a subscription for—so I built it myself, and now it's yours too.