System Online

Your training deserves
better software.

Fitness OS tracks real fatigue — muscles and nervous system — and tells you when you're ready to attack. No badges, no fake streaks.

bio-engine v2.5 — live telemetry
> CNS STATUS :: 72% — rest 4h
> CHEST ················ 96%
> LEGS ················· 22%
> BACK ················· 88%
> SHOULDERS ··············· 61%
> GHOST MODE :: Last workout: Bench 100kg × 8 · Beat it today
Fitness OS App Interface
15
Days completely free
All PRO features. No credit card.
Launch System → Sign up free

Why Fitness OS

Everything you know about fitness apps is wrong.

⚡
Knows exactly when to strike
No guesswork. Tracks systemic CNS fatigue and local muscle recovery. Green means attack. Red means stay home.
👻
Fight your clone
Your last session is your only opponent. See the exact tonnage and reps from last week, then crush them with one tap.
📊
Raw telemetry. Zero badges.
We left the colorful confetti to jogging apps. Get a pure consistency heatmap and progressive overload charts.
🧠
AI Post-Mortem analysis
The app speaks when you're done. Two surgically precise sentences: what you crushed today, and what system needs to rest.
📡
Built for basement gyms
No cell service? Who cares. The architecture logs every set locally and silently syncs to the database when you surface.

Access

Simple.

Free
$0
Forever
Unlimited logging✓
Ghost Mode✓
Workout history✓
Recovery dashboard (global)✓
PRO Annual
$49.99/yr
Save $33.89 vs monthly billing ($83.88/yr)
Best value
Everything in PRO✓
Save $34/year vs monthly✓
Get annual plan
PRO
$6.99/mo
15 days free
Everything in free✓
Bio-Engine per muscle group✓
AI post-mortem analysis✓
Smart Timer✓
Weekly AI brief✓
Gym Lens AI✓
Try 15 days free