Every set. Every gym.
On your iPhone.
A beautifully crafted gym and strength tracker — built in Apple's design language, with privacy at its core.
Built for the way you train
Thermal Muscle Map
A dynamic 7-day heatmap across male and female figures shows exactly which muscles you trained, and how hard. Read fatigue and recovery at a glance.
Live Workout Runner
A focused active view to log sets, weights, and reps. Personal records surface the moment you hit them, with real-time heart-rate zones when enabled.
Multi-Gym Tracking
Keep logs and PRs organized per location, so different equipment and plate weights never blur together across the gyms you train at.
Smart Exercise Library
A searchable, filterable picker for every exercise. Effective weight for bodyweight variants is calculated for you, automatically.
Optional Heart Rate
Heart rate is optional — include it only when you want it. Your iPhone conducts the workout; a paired Apple Watch or Garmin streams heart rate back automatically.
Private by Design
MSCLS runs entirely on your iPhone. No accounts, no analytics, no tracking. If you use iCloud, sync stays in your own iCloud account.
Health Sync & Strava Export
Send finished sessions, durations, and heart-rate data to Apple Health. Opt in to upload a workout to Strava as a rich strength activity — complete with a muscle heatmap, heart-rate chart, and a per-exercise breakdown.
Your week, rendered as heat
Every muscle you trained over the last seven days, shaded by how hard. Read it on male or female figures — switch anytime — so the muscles you overcook and the ones you skip are obvious at a glance.
Log a set, catch the PR
A focused runner keeps your weight and reps front and centre, then calls a personal record the instant you pass it. No spreadsheet, no mental math.
Heart rate, on your terms
Your iPhone runs the whole session on its own. Pair an Apple Watch or Garmin only when you want the zones, and leave it off when you don't.
Frequently asked questions
What is MSCLS?
MSCLS is a beautifully crafted gym and strength-training tracker for iPhone. You log your workouts, exercises, sets, weights, reps, and gym cardio, then see what you trained on a dynamic per-muscle thermal map. It's built with Apple's design language to feel right at home on iOS.
Is my data private? Does the app phone home?
Yes, it's private. MSCLS runs entirely on your device with no data collection, no analytics, no tracking SDKs, and no account or login. Nothing leaves your device unless you choose to share a workout to Strava, and if you use iCloud, that sync stays within your own iCloud account.
Do I need an Apple Watch to use MSCLS?
No. Heart-rate capture is completely optional and you can skip it entirely. If you do want heart rate in your workouts, your iPhone conducts the session and a paired Apple Watch or Garmin watch streams the readings back automatically. The watch is a heart-rate sensor only — you log all of your sets on the iPhone.
Does MSCLS sync to Apple Health?
Yes. You can sync your finished strength sessions, workout durations, and heart-rate data to Apple Health, so your training lives alongside the rest of your health information.
Can I export or share my workouts to Strava?
Yes, and it's strictly opt-in. Once you connect your Strava account, you can upload a finished workout as a rich strength activity — rendering Strava's muscle heatmap, a heart-rate chart, and a clear per-exercise breakdown of your sets, reps, and weights. Nothing is sent to Strava unless you upload it, either per workout or automatically once you turn auto-upload on.
I train at more than one gym. Will MSCLS keep that organized?
Yes. Multi-gym tracking keeps your logs and personal records separate per location, so different equipment and plate weights stay properly organized across the gyms you train at.
What devices does MSCLS run on?
MSCLS is an iPhone app. An optional Apple Watch or Garmin watch can be paired purely to stream heart rate during a workout, but no watch is required — all of your logging happens on the iPhone.
How much does MSCLS cost?
MSCLS is €1.49/month with a 30-day free trial, or €24.99 once for lifetime access. You can always see current pricing on the App Store. The app is purchased as-is, with its current feature set.
How do I get support or send feedback?
We'd love to hear from you. Email us at mscls.app@icloud.com with any questions, feedback, or issues, and we'll get back to you.
Still have a question we didn't answer here? We're happy to help.
Get in touchAvailable on the App Store
MSCLS is out now. Download it and start tracking every set, in every gym, on your iPhone.
Download on the App Store