Kyulift - a local-first Android gym log: no backend, no account, auto-progression

I built Kyulift as a solo dev and it has no backend at all — no account system, no sync server, no analytics SDKs, no ads. Every rep you log is written to and read from your device, which also means it works fully offline on a basement gym phone.

The core mechanic is auto-progression: it derives your next set's weight and reps from last session's actuals (so no mental math at the barbell), estimates 1RM via the Epley formula, and benchmarks lifts against bodyweight-normalised strength standards instead of absolute numbers. CSV export included if you want to do your own analysis.

Feedback from people who actually lift — or who want to nitpick my offline data model — very welcome.

Play Store: https://play.google.com/store/apps/details?id=com.pennylume.kyulift