What costs money?

Almost nothing. Your history, trends, charts, weigh-ins, water, the watch apps, exporting your data and re-logging a saved favorite are free and stay free. What's limited is talking to Gretl, because every message runs an AI model we pay for: a free account gets 3 messages a day, shared with Siri and the watch, resetting daily. Gretl Pro raises that to 50 a day and unlocks the adaptive check-in, which retunes your calorie target from your own intake and weigh-ins.