About ActivityDoctor

ActivityDoctor is an independent browser-based activity file toolkit focused on privacy, transparent diagnostics and conservative repair.

What we are building

The goal is to make FIT files understandable before they are changed. The site separates validation, anomaly detection, safe repair, salvage and compatibility rebuilding rather than promising a one-click repair for every form of corruption.

Privacy-first tools

Core activity processing happens in your browser. This reduces server cost and, more importantly, avoids intentionally sending precise workout files to an application backend.