Supportive users are most successful at weight loss with a Withings Wi-Fi Scale.

We recommend the Withings Body, currently $59.99 on Amazon. More expensive scales offer dubious measurements of body fat and heart health, but these are not accurate enough to be worth tracking.

Supportive also links with Fitbit Aria scales, but due to limitations in the fitbit API, they do not work as well as Withings scales.

Supportive can also sync weight from Apple Health, but this requires opening the app to instigate a sync, and due to limitations in iOS, it cannot happen in the background.

With any other scale, you can still use Supportive and just log your weight manually. But it’s really nice to have an auto-syncing wifi scale.