Schwarzy – Open source gym tracker that adapts to how you feel

Summary: Schwarzy is a privacy-focused workout tracker that adjusts weight progressions based on user-reported form quality and recovery. It stores all data locally, offers visual progress tracking, and supports program imports, enabling personalized and adaptive training without cloud dependency.

What it does

Schwarzy tracks workouts by letting users rate each set’s difficulty and form, then auto-adjusts weight suggestions accordingly. It overlays previous sessions for comparison, provides form cues, and supports structured programs via JSON imports, all within a mobile-first, offline-capable app.

Who it's for

It is designed for gym users seeking a data-private, adaptive training tool that accounts for physical feedback rather than fixed progression models.

Why it matters

Schwarzy addresses the limitations of traditional workout apps by incorporating pain-based progression and keeping user data fully private, helping prevent injury and improve training decisions.