Last updated 14 September 2026
Stellato Labs is a free racket fitting and string-tracking tool, offered as-is. By using it, you agree to the following:
The fitting questionnaire produces suggestions — frames, strings, tensions, and restring schedules — based on the answers you give. These are starting points for testing, not guarantees, and not professional coaching or medical advice. See a doctor about any arm or joint pain rather than relying on anything this app says.
We don't sell rackets or strings through this app. Product links go to plain web searches so you can compare retailers yourself; we take no commission on them.
You need to be at least 13 to create an account. If you're under 13, you're still welcome to use the app — just use it without an account, which needs no name and no email address and works exactly the same. If you're under 18, please get a parent's okay before making an account.
If you create an account, you're responsible for keeping your login details to yourself. Delete your account any time from Settings → Danger zone.
An account can also ask for restring reminder emails. That is off unless you switch it on, and you can switch it off again in Settings or from the link at the bottom of any reminder.
The app is provided as-is, with no warranty of any kind. We're not liable for equipment purchases, stringing outcomes, or injuries that follow from using a recommendation this app produced.
These terms may change as the app does. Continuing to use the app after a change means you accept the new terms.
Questions: stellatostrings@gmail.com