Syzify

Syzify is a free, open-source training log that runs as a native desktop app. There is no account, no cloud and no telemetry: your workouts live in a folder on your disk, and the app works without a connection.

Import

• GPX, FIT and TCX files, plain or gzipped, from Garmin, Wahoo, COROS, Suunto, Polar and other devices
• Whole folders, including a full Garmin Connect or Strava export and a Runkeeper archive
• Original files are preserved byte for byte

Analysis

• Parses HRV, time in zones, swim strokes, strength sets, running and cycling dynamics, and power with NP, TSS and Training Effect
• Heart rate, power, cadence and speed charts colored by your device's zones
• Personal bests per sport and distance, a training calendar and weekly volume by sport
• A world map of every start point, with five map styles and a local tile cache for offline use

Privacy and your data

• Optional encryption of files, database and photos with one password (AES-256-GCM and SQLCipher)
• The whole vault backs up into a single portable zip and restores anywhere
• Any activity can be exported back to GPX
• Share images are composed in the app and exported as PNG, with nothing uploaded

Extensible through sandboxed WebAssembly plugins with explicit permissions and network access closed by default.

Syzify is desktop only: there is no mobile app, sync service or social feed