AutoSleep vs Caliber

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.

Caliber is a strength training and coaching app offering over 60 structured training plans built by coaches, alongside unlimited custom workout creation for solo training. It scores users on metrics like a 'Strength Score' relative to their potential and 'Strength Balance' across muscle groups, and pairs the self-guided app experience with optional in-app coach messaging, video form reviews, and nutrition and habit tracking synced with Apple Health.

• 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

• Combines self-guided app tracking with real human coach access
• Strength Score and Strength Balance give quantified, motivating progress metrics
• Large library of pre-built structured training plans
• Apple Health integration consolidates fitness data in one place

• 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

• Coaching-tier pricing is significantly more expensive than pure tracking apps
• Full pricing isn't published on the site without starting a consultation
• Primarily iOS/Android focused, no dedicated web app for logging