What still works without a wearable
- Voice, text, and barcode food logging.
- Calories, macros, and eating style presets.
- Water tracking and meal journaling.
- Manual weight check-ins and trend review.
- Manual workout notes if you want to record activity without a watch.
What a watch adds
A wearable can make activity data easier to capture automatically. On iPhone, the supported path is Apple Watch through Apple Health / HealthKit. On Android, the supported path is a Google / Wear OS watch through Health Connect. But if you are mostly trying to improve meal consistency, protein intake, calories, or hydration, you can start with HeyOakley alone.