Kettle Muscle
Kettle Muscle

Lift with
intent.

The lifting app that respects what you already know.

Built for people who already train. Plans the next session around the muscles that have actually recovered. Logs every set the instant you tap, with or without signal. No streaks, no feed, no shame.

iPhone · iOS 17 and up
Today screen — recovery silhouettes, today’s lift, streak.
Readiness screen — front and back muscle maps with each muscle marked Fresh or Heavy load.
Workout-in-progress screen — set logger with weight, reps, and Log set CTA.
History screen — weekly muscle-volume bars and your most-trained muscles.
Today

Recovery, streak, your next lift.

Readiness

See what’s recovered before you train.

Log

Every set. Every rep. Locally first.

See

Honest numbers. What your body has been through.

Built for the load
11+Muscle groups trackedPer-muscle freshness. Not a single whole-body soreness score.
0 msWait between repsEvery set lands the moment you tap. Dead-zone gyms included.
YoursYour data, your accountLogged on your phone first, then synced privately to your account so a lost phone doesn't lose your training. We never sell it or share it with advertisers.
Plan

It knows what you cooked yesterday.

Every set you log shapes tomorrow's session. Push, pull, hinge, squat, carry — each works on its own recovery clock. Open the app in the morning and the day is already built around what's fresh.

  • Per-muscle freshness. Not a whole-body soreness score.
  • Re-plans the rest of the session when you swap or skip a lift.
  • Suggestions stay grounded in your own history. Never prescribes outside what you've actually done.
iPhone showing the Readiness screen — front and back muscle maps with a per-muscle list marked Fresh, Light, or Heavy load. Real Kettle Muscle screenshot.
Log

Every set, instantly.

Gym wifi cuts out. Subway tunnels happen. Sets still log the moment you tap. When you're back on signal, your history follows you across devices in the background. No spinner between reps.

  • Logs every set instantly, online or off.
  • One-tap log. Big targets. Haptic on every change.
  • Your training follows you across devices once you're back on signal.
iPhone showing the workout-in-progress screen with weight, reps, and a Log set CTA. Real Kettle Muscle screenshot.
See

Honest numbers. No streak badges.

Volume, sessions, PRs, muscle distribution — where you'd expect them, never behind a paywall or a ribbon. The recovery view shows what your week has actually put your body through. Not a generic rest day.

History overview — this year’s sessions, total volume, streak, and strength score, plus recent weekly cards. Real Kettle Muscle screenshot.
Sessions · Volume · Score
History detail — personal records, plateau flags, and a per-exercise progression chart. Real Kettle Muscle screenshot.
PRs · Progression
History distribution — weekly muscle-volume bars and your most-trained muscles over the last 30 days. Real Kettle Muscle screenshot.
Muscle volume
Kettle Muscle

We built the app we wanted.

No streaks. No social feed. No subscription gate on basic logging. Your training, not the app's opinion.