A look inside
Clean enough to use daily, deep enough to learn from
Built in React Native and Expo, tested on real devices, over 1,900 passing tests behind it.
Free · Open source · Android
SoulSync keeps everything on your phone. No account. No cloud. No ads. Over 1,900 passing tests, GPL-3.0, free forever.
Google Play · GPL-3.0 · Free forever
SoulSync is GPL-3.0 source code that runs on your phone. Nobody can add a paywall, sell your patterns, or shut it down. That is the actual design.
Your entries, notes, photos, and reminders stay on the device. No sync. No backup to our servers. Nothing leaves.
Finer resolution than the usual five smiley faces, because a 7.5 kind of day is a real answer. Tag activities, write notes, attach photos, and backdate anything you missed.
Mood trend with an adaptive moving average, a heatmap calendar of your whole year, day-of-week patterns, distributions, and correlations. No paywall to see your own data.
Press and hold anywhere on a chart to scrub day by day. The readout names the date, that day’s average, and the entry you actually wrote.
Tap a chart to open it full screen. Flip on Fit and the scale zooms to your own range instead of a flat 0 to 10, so small differences stop hiding.
Swipe left or right on Statistics to step through weeks, months, quarters, and years. The whole page moves with you, not one chart at a time.
Tap an activity for its own analytics. Its mood distribution, whether it is a hit-or-miss activity, how days with it compare to your usual, and what it tends to pair with.
A dedicated Insights tab that reads your data back to you. Which day of the week lifts you, which activity is worth an extra 1.7 points, how long the current streak runs.
One JSON file carries your entries, notes, and the photo bytes themselves, so a restore works on a different phone. You own the format, not a proprietary backup scheme.
Dark, Light, Cherry Blossom, Midnight Blue, and Forest. All included. No premium theme tier.
Name them and time them, up to ten. A morning check-in, an evening reflection, whatever fits your day. No streaks to protect, no engagement engineering on top.
The source is on GitHub. Fork it, audit it, run your own build. The license is the privacy guarantee.
A look inside
Built in React Native and Expo, tested on real devices, over 1,900 passing tests behind it.
Three articles on the decisions behind SoulSync: the Daylio comparison, the local-first architecture, and why subscriptions make bad tools.
Free. No account. No subscription. Download on Google Play and your first entry is logged in under a minute.