AutoSleep vs Yazio

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.

Yazio is a nutrition and fitness tracking app that lets users log food through photo recognition, manual entry, or barcode scanning, and track calories, macros, and water intake. It also includes built-in intermittent fasting timers supporting common schedules like 16:8, 5:2, and 6:1, plus a library of more than 3,000 customizable recipes. The app can sync with other fitness trackers to automatically log activity and reports serving around 100 million users globally. Its website also offers free standalone tools including a BMI calculator, ideal weight calculator, and daily calorie intake calculator.

• 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

• Multiple food-logging methods including photo and barcode scanning
• Fasting timers built directly into the tracking app
• Large recipe library included
• Free calculator tools available without an account

• 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

• Detailed subscription pricing is not listed on the main site
• Large recipe and feature set can feel overwhelming to new users
• Some advanced tracking features likely require a paid tier