Kilo – Open-source, local-first workout, weight and calorie tracker
Strong app clone with anatomical heatmaps, but Android-only limits the audience.

It refuses the modern fitness app script: no accounts, no servers, truly offline and a CSV export so your logs live with you. The UI is spare and fast — instant set logging and basic progress charts — but it doesn't push past the basics (no wearable sync, advanced analytics, or social features), which is fine if you just want a distraction-free training journal.
Serious lifters and privacy-conscious gym-goers who want a simple, no‑friction workout log without social features or subscriptions
Strong app clone with anatomical heatmaps, but Android-only limits the audience.
Apple Health visualizer with beautiful UI, but existing apps (Healthkit, Cardiogram) already do this.
Firebase workout tracker competing with Hevy, Strong, and MacroFactor with no differentiation.
Clean Apple Health viewer, but HealthFit and SmartGym already do this.
Fitness + territory conquest is a fun concept, but Ingress/Pokémon GO already nailed this.
No-code fitness app, but Fitbod and Fitness+ already own this category.