AutoSleep vs Hevy

AutoSleep is a sleep-tracking app for Apple Watch and iPhone that records sleep automatically in the background, without requiring the user to start or stop a session. It uses heart rate, motion, and (where available) blood oxygen and wrist temperature data to estimate sleep stages, sleep quality, and a running sleep debt total called the sleep bank. The app integrates with Apple Health and HomeKit, offers a smart alarm that wakes users during a lighter sleep phase, and includes an add-on companion app, AutoSnore, for snore detection. It is sold as a single one-time purchase on the App Store rather than a subscription, and processes data on-device rather than through a cloud account.

Hevy is a workout tracking app for logging strength training sessions, building custom routines, and monitoring progress over time through charts, personal records, and estimated one-rep max calculations. It also includes social features so users can follow other athletes and share workouts within the app's community.

• One-time purchase price with no ongoing subscription fees
• Fully automatic tracking that does not require remembering to start or stop a sleep session
• Detailed metrics including sleep stages, SpO2, respiration rate, and wrist temperature on supported hardware
• On-device processing with no account or login required for basic use

• Free core logging with a highly rated experience (4.9/5 on both app stores)
• Detailed progress tracking including personal records and 1RM estimates
• Smartwatch support for logging without a phone
• Large existing user base of over 15 million athletes

• Requires an Apple Watch for automatic tracking; iPhone-only use is far more limited
• Advanced metrics like SpO2 and respiration depend on specific newer Apple Watch models
• Interface and terminology (sleep bank, sleep debt) have a learning curve for new users

• Full feature set likely gated behind a premium tier not detailed on the homepage
• Primarily built for strength training, less suited to cardio-focused tracking
• Community/social features may not appeal to users who want a private log