Norwegian HIIT starting at 30 seconds, scaling to the full 4×4 protocol
Android workout tracker for strength training with AI integration
Stage
Not given
Not given
Founded
Not given
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Based in
PL
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Pricing model
Free
Freemium
Pricing
Not given
Free: $0 forever with up to 3 routines, 5 custom exercises, 90 days of history, and 60 AI tool calls per month. Pro: $19.99 for the first year (renews at $29.99/year), with unlimited routines, unlimited custom exercises, no AI call cap, and complete history. Free 14-day Pro trial available.
Key features
Progressive on-ramp starting at 30-second intervals
Voice-guided coaching throughout entire session
Lock Screen and Dynamic Island display (iOS 17+)
Works with screen locked and music playing
Available in four languages
Personalized heart-rate zones computed from max heart rate
Native Apple Watch Workout app integration
Adaptive level progression based on recovery data
No account, no ads, no tracking
Build custom routines and log sets with weight and reps
Automatic rest timer that runs with screen locked
Track personal records and estimated one-rep max
Progress charts for weight, reps, volume and one-rep max
Works offline with automatic sync
Connect ChatGPT or Claude to analyze training data
CSV import and export
Custom date ranges for statistics
Pre-filled last weight and reps for next set
View muscle group coverage
What makes it different
Structured progressive on-ramp that no other 4×4 resource offers
Never forced progression: holds levels based on recovery data and never uses shame mechanics
Privacy by design with no account or tracking required
Works completely with screen locked and music playing through voice cues
Works completely offline until you go online to sync
Rest timer keeps running with screen locked or app in background
Free version includes basic AI tool calls without requiring Pro
Older workouts on Free are locked, not deleted
OAuth-protected AI connections with choice of read-only or edit access
Crescendo 4×4