Terms of service
Last updated: November 9, 2026
These terms are an agreement between you and Danny Hilario Suarez, who operates Danna ("Danna", "we", "us"), for your use of the Danna app and website (the "Service"). By creating an account or using the Service you agree to them. If you don't agree, don't use the Service.
1. What Danna is
Danna helps you test everyday changes on yourself. For each experiment it plans test days and normal days over 28 days, records your daily check-ins, reads health data from sources you connect, and gives you a verdict comparing the two kinds of day.
2. Not medical advice
Danna is not a medical device and does not provide medical advice, diagnosis or treatment. Verdicts are statistical summaries of your own data, which can be incomplete or inaccurate, and they can be wrong. Don't use Danna to make decisions about a medical condition, and don't start, stop or change any medication or treatment because of it. Talk to a doctor before trying an experiment if you are pregnant, have a health condition or take medication; for example, before fasting, cold exposure or changing what you drink. In an emergency, call your local emergency number.
Only try experiments that are safe for you. You take part in every experiment voluntarily and can stop at any time.
3. Who can use Danna
You must be at least 18 years old. You are responsible for keeping your sign-in details safe and for everything done with your account.
4. Your data
Your data belongs to you. You give us permission to store and process it only to provide the Service, as described in the privacy policy. You can disconnect a data source or delete your account and all of its data at any time.
5. Acceptable use
Don't misuse the Service: don't try to access other people's accounts or data, interfere with or overload the Service, reverse-engineer it except where the law allows, or use it for anything unlawful.
Friend groups: when you create a group you agree to these terms. A group's name must not be hurtful or harassing, sexual or unsafe, or spam or a scam. Anyone in a group can report its name; we review reports and may remove a name, and the group is not told who reported. You can block anyone; they are not told, they no longer see your check-ins and they cannot invite you again. Friends and group members only ever see that you checked in, never your answers.
6. Third-party services
Danna reads data from services such as Health Connect, Samsung Health, Oura and Dexcom, and lets you sign in with Google. Those services are governed by their own terms, and we aren't responsible for their availability or the accuracy of the data they provide.
7. Changes and availability
Danna is offered free of charge. We may change, pause or stop parts of the Service. If we make significant changes to these terms, we will tell you in the app before they apply; continuing to use the Service after that means you accept them.
8. Ending your use
You can stop using Danna and delete your account at any time. We may suspend or close an account that breaks these terms.
9. Disclaimers and liability
The Service is provided "as is" and "as available", without warranties of any kind, including that verdicts are accurate or that the Service will be uninterrupted. To the fullest extent the law allows, we are not liable for indirect, incidental or consequential damages, or for any decision you make based on the Service. Nothing in these terms limits liability that cannot be limited by law, or your rights as a consumer where you live.
10. Contact
Questions about these terms: dannyhilariosuarez@gmail.com.