ButterLaps – butter-smooth lap fixes for .fit files

Fix accidental, late, or missed lap splits in your Garmin, Apple Watch, or Stryd .fit files. Edit lap boundaries visually in your browser – no upload, no account, your activity file never leaves your device.

Read the guides for fixing accidental lap presses, interval and track-workout splits, Stryd power data, and Apple Watch workouts.

ButterLaps is an independent tool. It is not affiliated with, endorsed by, or sponsored by Apple, Garmin, Strava, Stryd, or any other device maker or platform. Those names are trademarks of their respective owners and are used only to describe compatibility.