If your gym notebook had a brain.
The training app built for hard gainersectomorphsskinny lifters
Stop following generic programs. Keelow uses smart progression algorithms designed specifically for skinny lifters who want to build real muscle.
Free beta access for iOS
Built different? Train different.
Generic apps don't work
Most fitness apps assume average genetics. They push aggressive deloads and cookie-cutter programs that kill your momentum.
You plateau constantly
Without smart progression, you're either stuck at the same weight or jumping too fast and burning out.
Keelow is the answer
Our algorithm understands hard gainers. It's patient when you need patience, and pushes when you're ready.
Everything you need to grow
Track workouts, analyze progress, and follow smart training plans.
Workout Tracking
Log every rep with precision. Track what matters.
- Exercise logging with sets, reps & weight
- RPE (Rate of Perceived Exertion) tracking
- Workout session management
- Exercise history and progression
Analytics & Insights
See the data behind your gains. Make smarter decisions.
- Weekly volume trends
- Weight progression charts
- Personal records (PR) tracking
- Recovery readiness prediction
- Exercise optimization recommendations
Bodyweight Tracking
Monitor your weight alongside your lifts.
- Weekly weight entries
- Weight trend visualization
- Change feedback and advice
Training Plans
Structured programs designed for hard gainers.
- Multiple splits: PPL, Upper/Lower, Full Body, Body Part
- Customizable training goals
- Weekly schedule preview
- Split rationale explanation
Three steps to consistent gains
No complicated setup. Just results.
Quick onboarding
Enter your weight, select your goals, and learn how the AI features work. Takes under a minute.
Log your workouts
One-tap logging. Record sets, reps, and weight. Optional RPE for even smarter recommendations.
Follow the algorithm
Get personalized weight recommendations with confidence scores. Progress at exactly the right pace.
Backed by exercise science
Not bro science. Real science.
Based on Schoenfeld et al., 2016 — mechanical tension and volume accumulation drive hypertrophy.
6-12 reps maximizes muscle growth. Our double progression keeps you in the sweet spot.
Research shows total weekly volume matters more than single-session intensity for hypertrophy.
Two consecutive sessions at top of rep range = time to add weight.
Why I built this
"I built Keelow because I understand how difficult it is to put on mass as a skinny guy, I was also tired of 'AI' fitness apps telling me to deload when I just needed to add one more rep. This is for the people who want to track their progress, not their 'vibes', and follow a science-backed system."
What beta testers are saying
Real feedback from real hard gainers.
"Finally an app that doesn't tell me to deload every other week. The progression algorithm actually understands that some of us need more time to adapt."
"The weekly volume tracking changed everything for me. I can actually see my progress now instead of just guessing if I'm doing enough."
"Simple, clean, and actually useful. No bloated features I'll never use. Just tracks what matters and tells me when to progress."
Frequently asked questions
Everything you need to know about the beta.
Is Keelow free?
Yes! The beta is completely free. We'll introduce pricing when we launch on the App Store, but beta testers will get special perks.
What devices are supported?
Keelow is currently iOS only (iPhone). You'll need iOS 16 or later. Android is on our roadmap for after the official launch.
What is TestFlight?
TestFlight is Apple's official platform for beta testing apps. It's safe, secure, and lets you try Keelow before it hits the App Store.
How does the progression algorithm work?
We use double progression: you increase reps first, then weight. The algorithm tracks your performance over multiple sessions before suggesting changes—no knee-jerk deloads.
Can I import my existing workout data?
Not yet, but it's on our roadmap. For now, the app learns from your workouts as you log them.
How do I give feedback?
There's a feedback button right in the app! You can also reach us on X/Twitter @keelow_app or via email.
Ready to finally make gains?
Download the beta and start tracking your progress today.