Stack: Running Log
Run Happy. Run Fast!
Only for iPhone
Free · In‑App Purchases · Designed for iPhone
iPhone
Most training apps overwhelm you with comparisons, arbitrary pace targets, AI-generated summaries, and constant recommendations.
Stack removes the complexity.
What’s left is a clean, focused system that helps you listen to your body and train based on how you actually feel not external metrics.
Train Smarter With Less
- Track fatigue and form in one simple visual chart
- Identify your optimal training zones
- Prevent overtraining and undertraining
- Build consistent routines that support long-term progress
- Judgement free
Stack is deliberately simple. When you remove pressure and unnecessary data, your training becomes more intuitive and sustainable.
Less is more.
Start your 7-day free trial today.
Privacy Policy: https://www.stackapp.run/privacy-policy
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
Bug fix!
The developer, RootCause LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- RootCause LLC
- Size
- 58.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.6 or later.
- iPhone
Requires iOS 15.6 or later. - iPod touch
Requires iOS 15.6 or later. - Mac
Requires macOS 12.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Stack Monthly Subscription $2.99
- Stack Yearly Subscription $19.99
- Copyright
- © 2026 RootCause LLC. All rights reserved.