Strava Cheat Detector

Tracking since May 27, 2026.

Changelog

• Jun 3, 2026
  description

  Strava Cheat Detector is a free browser extension that adds a real-time analysis widget to any Strava activity or segment page.
  
  It scores suspicious patterns on a 1 to 10 scale across multiple criteria:
  
  - Average Speed : compared to sport-specific world records (marathon, cycling hour record, swim WRs)
  - Running Pace : benchmarked against Cheptegei, Kiplimo, and Sawe's world records
  - Moving vs Elapsed Time : detects cherry-picking (watch paused during slow/rest periods)
  - Pace vs Speed Consistency : the most reliable signal: if pace implies 12 km/h but avg speed is 6 km/h, the watch was paused ~50% of the time
  - GPS Spike Ratio : flags motorized vehicle contamination or GPS drift
  - Elevation Coherence : detects GPS altimeter errors
  - KOM Speed (segments) : grade-adjusted using the Minetti 2002 scientific formula
  
  The overall score is weighted: cherry-picking signals carry more weight than raw speed, since most cheating on Strava involves pausing the watch rather than physically impossible speeds.
  
  All analysis is heuristic and based on visible page stats only, no raw GPS data is accessed. A suspicious score is not proof of cheating.
  
  Made by @mattilontra

  Strava Cheat Detector is a free browser extension that adds a real-time analysis widget to any Strava activity or segment page.
  
  It scores suspicious patterns on a 1 to 10 scale across multiple criteria:
  
  - Average Speed : compared to sport-specific world records (marathon, cycling hour record, swim WRs)
  - Running Pace : benchmarked against Cheptegei, Kiplimo, and Sawe's world records
  - Moving vs Elapsed Time : detects cherry-picking (watch paused during slow/rest periods)
  - Pace vs Speed Consistency : the most reliable signal: if pace implies 12 km/h but avg speed is 6 km/h, the watch was paused ~50% of the time
  - GPS Spike Ratio : flags motorized vehicle contamination or GPS drift
  - Elevation Coherence : detects GPS altimeter errors
  - KOM Speed (segments) : grade-adjusted using the Minetti 2002 scientific formula
  
  The overall score is weighted: cherry-picking signals carry more weight than raw speed, since most cheating on Strava involves pausing the watch rather than physically impossible speeds.
  
  All analysis is heuristic and based on visible page stats only, no raw GPS data is accessed. A suspicious score is not proof of cheating.
  
  Made by @mattilontra
  
  v1.0.1 — Bug fixes
  
  - Fixed average speed being read from weather wind data instead of activity pace on running pages
  - Fixed moving time incorrectly read from a segment instead of the full activity, causing false cherry-picking flags
  - Fixed grade percentage not parsed correctly on French locale pages (comma decimal separator)
  - Fixed swim activities misdetected as cycling

Permissions & access

Permissions

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Host access

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Screenshots