Murmur - Private notes that live in your own Google Sheet

Hey Product Hunt 👋 I built Murmur because I wanted one quiet place for my notes that I actually owned — not another SaaS holding my data hostage. The core idea: your notes live in your own Google Sheet, and the encryption key never leaves your browser (PBKDF2 → AES-GCM). The auth database that lets you log in across devices only ever sees ciphertext — it can't read your data or even tell where your sheet is. It's local-first, so it's instant and works offline, then syncs when you're back. It's open source and self-hostable, so you never have to trust me — you can read the ~200 lines of crypto/auth yourself. Would genuinely love feedback on the model and the UX. Happy to answer anything about the threat model 🙏 Try it: https://murmur-chat.vercel.app · Code: https://github.com/tusharmali/mu...