+ Add a new device

Apple Watch: All you need to do is accept Healthzilla's request to access Healthkit during the initial onboarding, and all the Apple Watch data will show up. If unsure, you can go to Apple's Health app under the Sources tab and see what permissions you have for Healthzilla to read and write.

Fitbit: You can log in and sync your Fitbit during the initial onboarding, or by going to the Settings screen in Healthzilla, and tapping Login next to Fitbit. You can choose which data to allow Healthzilla to read.

Oura Ring: You can log in and sync your Oura Ring during the initial onboarding, or by going to the Settings screen in Healthzilla, and tapping Login next to Oura. You can choose which data to allow Healthzilla to read.

Garmin: Garmin syncs most of their data to Healthkit, so you can follow the instructions for Apple Watch above.

Actxa: Actxa syncs most of their data to Healthkit, so you can follow the instructions for Apple Watch above.

Others: Many other devices support Apple's Healthkit, so if you're syncing your data there, Healthzilla can read it too. Just check your permissions as above with Apple Watch.

+ Use other apps

Sync all your health, fitness, nutrition and mindfulness apps to Apple's Health app. It is you personal and secure data storage where you can keep all your data safely in one place. No app can access that data without asking you for permission to do so. You can sync your data to Health Kit in the settings of each app.

+ Enter data manually

On the Today Tab on the Healthzilla app, a plus (+) button indicates you can tap the icon to add data, and you will be prompted to add some data manually. This can be useful for things like weight or bodyfat that you measure on a scale.