Mass is a clean, focused strength training app designed to make workout tracking simple and consistent.
Features
Fast Workout Logging
Log sets quickly with reps, weight, and notes in a flow that stays out of your way during training.
Custom Workouts
Create and organize your own workouts so your plan matches your routine.
Plate Math and Warm-Up Support
Get plate math for barbell lifts and warm-up set suggestions based on your working weight.
Progress Over Time
Track weekly training volume, consistency, and session history so you can spot trends and keep improving.
Built for Lifters
Mass is designed for beginners and experienced lifters alike, with a clear focus on consistency and progressive overload.
Privacy Policy
Your privacy matters to us. This policy explains what data Mass collects and how it is used.
TL;DR
Mass stores your training data on-device and uses iCloud (CloudKit) for sync. It uses Firebase Analytics and Crashlytics to improve app quality. Notifications are optional and only used with your permission.
What Data We Collect
Workout Data
- Workouts, exercises, sets, reps, weights, and notes you log in the app
- App settings such as preferred units and workout preferences
Sync Data (iCloud / CloudKit)
- Workout data can be synced to your private iCloud account to keep your data in sync across your devices
Analytics and Crash Data (Firebase)
- Feature usage, app version, and device-level diagnostics
- Crash and stability information used to debug and improve reliability
Notifications
- If you allow notifications, Mass can send rest timer alerts during workouts
What We Don’t Collect
- No account registration is required to use Mass
- No ads or ad-tracking SDKs are used
- We do not sell your personal data
How We Use This Data
- Keep your workouts and progress available across devices (when iCloud sync is enabled)
- Improve app stability, performance, and feature quality
- Provide optional features like rest timer notifications
Third-Party Services
Mass uses:
- Apple CloudKit for optional iCloud sync
- Firebase Analytics for anonymous usage analytics
- Firebase Crashlytics for crash reporting
Your Data Controls
- You can manage notification permissions in iOS Settings
- You can manage iCloud access for Mass in iOS Settings
Changes to This Policy
We may update this policy occasionally. Changes will be posted here with a new date.
Contact
Questions about Mass? Email us at mass@runarhummelsund.dev
Safety Notice
Mass is intended for workout tracking and general fitness use only. It does not provide medical advice.
Use Mass responsibly and train within your limits. If you have a pre-existing medical condition, injury, experience pain, dizziness, or have any health concerns, consult a qualified healthcare professional before starting or changing your exercise routine.
Exercise carries inherent risk, and you are responsible for how you use the app and apply the information you log in it.
Last updated: February 2026