Intrvl

Most people training make two critical mistakes—and they're costing you gains.

Mistake #1: Rushing rest
Research shows optimal rest depends on your goal: 30-90s for endurance, 1-3min for hypertrophy, 3-5+min for strength. Rushing rest leaves gains on the table. 

Mistake #2: Training on memory
"What did I lift last time?" Without data, you're guessing. Without progressive overload, you're just working out—not building results.

Intrvl solves both problems with precision timing and complete tracking—giving you the tools to rest properly, track consistently, and progress deliberately.

PRECISION TIMER THAT NEVER DRIFTS

• Background-safe countdown engine (accurate even when app is closed)
• Dynamic Island & Live Activities (Lock Screen + Live timer controls)
• Unified timer + weight entry (log sets without app-switching)
• Custom intervals for HIIT, Tabata, conditioning, or sport-specific drills

COMPLETE WEIGHT TRACKING

• Rep-by-rep logging with weight progression with only a few taps
• See exactly what you lifted last session
• Warm-up set tagging (excluded from analytics)
• Failure set marking (impacts Strain Score calculations)
• Full workout history on-device

ADVANCED ANALYTICS (100% ON-DEVICE)

Intrvl calculates proprietary training metrics that competitors charge subscriptions for—all included, all processed on your device for complete privacy.

• Strain Score — Quantifies training load by muscle group size and intensity; failure sets cost exponentially more
• Effective Volume — Excludes warm-ups; shows only work that drives adaptations
• Muscle Heatmap — Visual distribution of training focus across six muscle groups
• Training Density — Volume-per-minute, average rest times, work capacity trends
• Training Level — Beginner/Intermediate/Advanced/Elite indicator based on volume

PROGRAM MANAGEMENT

• Import multi-workout programs via file, or link (coaches can distribute via email/cloud/QR)
• Schedule workouts to specific dates
• Duplicate past workouts
• Full customisation and editing
• No servers. No accounts. Just file-sharing.

PRIVACY & OWNERSHIP

• "Data Not Collected" privacy label (rare in fitness apps)
• 100% on-device analytics calculations
• Optional iCloud sync (Apple-managed, company never sees data)
• Works entirely offline

ONE PAYMENT. LIFETIME OF GAINS.
$24.99 USD. 14-day free trial. No subscriptions. No ads. All features included—no premium tier for analytics.

Whether you're chasing competition results or building strength for life, the principles are the same: rest properly, track consistently, progress deliberately.

Built for intermediate to advanced lifters who already know how to train—and want precision tools without complexity.

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