Capture up to 10 daily signals, mark 2–4 as priority, and see them in one pill. Copy or download anytime. 100% local.



What is today's signal? Capture it, keep it in front of you, and let the noise fade.
Signal2Noise is a small, quiet side-panel note tool for people whose day gets loud. Built for people with ADHD by someone with ADHD. Jot down the things pulling at your attention, mark the two to four that actually matter, and watch them sit at the top of the panel in one simple pill — so the signal stays visible and everything else drops back.
It lives in the Chrome side panel, next to whatever you're working on. No account, no cloud, no sign-in. Everything you type stays in this browser.
Every core feature is unlocked: capture, mark, the priority pill, the ratio selector, copy, and download. No streaks, no scores, no shame, no paywall on the day-to-day. Signal2Noise asks one gentle question and keeps the answer where you can see it.
A single one-time unlock adds Trust Vault Backup — export and re-import your signals as one portable file saved to your own Downloads folder. No subscriptions, and no proxy through any 864zeros server: the file goes straight from your browser to your disk. It's a durable, movable copy for people who want one; the core app is fully usable without it.
Your signals live only in this browser (chrome.storage.local). Signal2Noise has no server and never transmits your notes — nothing you write leaves your device. Copy, Download, and the Trust Vault backup all run locally. No account, no tracking, no ads, no cloud. See exactly what stays put in the data-flow diagram above.
Built by 864zeros — local-first, privacy-first Chrome tools.