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Workout tracking with AI chat
Cinder app icon

Cinder

Log a set in seconds, replay the run in 3D, and watch your biological age move.

Download on the App Store See what it does

4.6 · 9 App Store ratings

  • iOS · watchOSRuns on
  • Health & FitnessCategory
  • v2.4Version
  • $2.99/moPrice
cinder/features

Everything a session needs, and nothing else

Log fast, see the trend, and let the Watch and Apple Health do the rest.

logging

Log a set in seconds

Tap reps and weight and move on. Lifting, cardio, rowing and bodyweight all live in the same log: no spreadsheet, no fiddling between sets.

🏋️ Bench Press set 3 / 4
8 × 185
repslbs
volume today 14,800 lbs
SET 18 × 185
SET 28 × 185
SET 38 × 185
SET 4–
progress

Proof that it is working

Your heaviest set per session plotted over time, so a good month is something you can point at rather than something you feel.

bench · heaviest set +18% in 12 weeks
apple watch

Start it from your wrist

A full Watch app and a Live Activity on the Lock Screen: your phone can stay in the bag.

🏃 MORNING RUN 2.4 mi 24:068’12″
live activity ⚡ no phone needed
ai chat

Ask your own history

The chat can see every session you have logged, so the answers are about you.

What’s my bench PR?
225 lbs, three weeks ago.
insights

Biological age

VO₂ max, resting heart rate, HRV, sleep and daily movement, resolved into one number that actually moves.

27.4 estimated age
6.6 years younger
Pace of aging 0.86×
SlowFast
0.6×1.0×1.4×
coverage

Know what today actually hit

Every logged set maps to the muscles it worked, so the group you have been quietly skipping stops being a surprise.

Cinder's muscle map for Push A, 6 exercises and 18 sets: chest, triceps and front delts lit red on the front of the body, side delts lighter Cinder's muscle map for Pull A, 6 exercises and 18 sets: lats, upper back and biceps lit red on the back of the body, rear delts, forearms, lower back and traps lighter
push a · pull a straight from the app
your home tab

It lands where you already look

Workouts write straight to Apple Health, and the home tab is yours to arrange: fifteen widgets for streaks, PRs, volume and the rest.

🔥 12day streak 225 lbbench pr 27.4biological age 💪 Muscle coveragewhat this week actually hit +18%volume
  • ❤️ Written to Apple Health
  • ⌚ Synced to the Watch
cinder/reviews · unedited, from the App Store

What people say

Cinder
★★★★★

“Helps me plan and track my workouts so I can reach my fitness goals!!”

lcassoutt
Cinder
★★★★★

“Been using this to log my sets and I love it! The ai insights are also super helpful and I love that I can pick which model I use. The run animation is also super cool!”

Ecass13
cinder/metadata

App information

Version 2.4
Updated 2026-10-12
Size 78MB
Compatibility iOS · watchOS
Download on the App Store