Muscle Gain Tracker
Log lean mass weekly to a spreadsheet and watch it climb as your training progresses.
Your total weight minus fat — this includes muscle, bone, water, and organs.
Lean mass is the number that matters when building muscle. Track it alongside body fat to see if your training and nutrition are working.
Log lean mass weekly to a spreadsheet and watch it climb as your training progresses.
Chart lean mass, body fat, and total weight together in Grafana for the full picture.
Email a monthly body composition summary highlighting lean mass gained and fat lost.
Monitor lean mass changes week over week to ensure you are gaining muscle on a bulk or preserving it on a cut.
Pair lean mass data with workout data in Notion to correlate training volume with muscle growth.
Send a notification when your lean mass crosses a personal milestone.
HC Webhook sends a JSON object to your endpoint. The lean_body_mass field contains an array of readings from the last sync window.
{
"timestamp": "2026-04-15T07:30:00Z",
"lean_body_mass": [
{ "kg": 64.2, "time": "2026-04-15T07:30:00Z" }
]
}No account required. Your data stays on your device.