FitNotes

A developer under the name DuarteSantos8 has released openGym, an open-source, self-hosted gym and body-weight tracker written in JavaScript. It lets users plan routines, log supersets, warm-ups and cardio, visualise which muscles are trained, fatigued or detrained, and import data from FitNotes, Strong or Hevy. Login supports passkeys, and all data stays on the user's own server, appealing to fitness enthusiasts wary of commercial apps.