Support
Questions, beta problems or requests about your data: talk to us. To delete your account, use the app itself: Você > Configurações > Excluir conta (You > Settings > Delete account). The app shows what is deleted and asks for your password. This does not remove your waitlist sign-up. To remove it, or if you can no longer open the app, talk to us.
Contact
Contact email coming soon.
Beta feedback
The feedback channel comes with the TestFlight invite.
How to install the beta
- 1Install TestFlight from the App Store.
- 2Open the invite on your iPhone.
- 3Install GainOS and create your account.
FAQ
Is it free?
During the beta, yes. To prevent abuse, each person has AI usage limits, per minute and per day. If you reach one, the app keeps working in a basic version until the limit resets. The model after the beta is not defined yet, and testers will hear first.
When does the beta start?
Soon. TestFlight invites go out in small batches, and joining the waitlist does not ensure an invitation. We give no date because it depends on Apple review — and we would rather not promise what we do not control.
Do I need an Apple Watch?
No. The Watch adds heart rate and calories to your workouts, and HRV and VO₂max to the analyses, but everything else works with the iPhone alone.
Does it work on Android?
Not yet. GainOS is iOS for now. Leave your email on the waitlist and we will tell you if that changes.
Does the AI replace a dietitian, a doctor or a trainer?
No. GainOS organizes training and nutrition based on science, but estimates and suggestions do not replace the guidance of health, nutrition or exercise professionals. If you have a health condition, talk to the professional who follows you before changing training or diet.
What happens to my plate photos?
Before the first photo, the app asks for your consent and says who receives it. The photo goes to the AI provider to produce the estimate, together with the time, the meal's target, your weight, your goal and your dietary restrictions; it keeps it for up to 55 days to prevent abuse and does not use it to train models. It is not kept on GainOS servers, location is stripped before upload, and a thumbnail stays on your iPhone: after 30 days, it is deleted when the app saves a new one. If you prefer not to send photos, manual entry remains available.
Does it work offline?
The whole workout and every log work offline and sync later. The AI needs a connection. When it does not respond, the scientific engine takes over and the app says so; in the coach, that note only shows until you close the app. Without internet, your question to the coach stays in the conversation, unanswered; while the app is open, just tap Try again.
I have a Garmin, Oura, Whoop, Fitbit or Samsung. Does it work?
GainOS reads Apple Health. Garmin Connect, Oura, Polar Flow and Zepp write workouts and heart rate there, so they work. Whoop writes part of the data. Fitbit needs a bridge app. Samsung Health does not sync with iOS.
Which language?
Brazilian Portuguese, from onboarding to the coach. English is not available in the app yet: only this site is in English.
How do I delete my account?
In the app itself: under Você > Configurações > Excluir conta (You > Settings > Delete account), with your password and a final confirmation. It cannot be undone. Right away, the server erases the account and what it keeps about you, and the iPhone you deleted it from erases its local copy; on another iPhone with the same account, delete the app. What stays: usage statistics with no link to you; the text of your limitations in the exercise cache, for up to 30 days; the technical logs the hosting provider keeps; and what the AI provider (up to 55 days) and your friends already received. The policy has the full list. Deleting in the app does not reach the waitlist: to take your sign-up off it, ask through the contact email.