terms of service

Effective November 13, 2026

These terms govern your use of Nerdi (nerdi.app), a shelf of learning games for children run by Decision Trees Inc. ("Nerdi", "we", "us"). By using Nerdi, or by creating an account, you agree to these terms and to our privacy policy. If you don't agree, please don't use Nerdi.

1. who can use Nerdi

Nerdi is made for children to play with a parent, guardian or teacher nearby. Accounts and subscriptions are for grown-ups only: you must be at least 18, or the age of majority where you live, to create an account or subscribe. If you let a child use Nerdi, you're responsible for their use of it and for these terms. Children don't need an account.

2. your account

You sign in with Google or Apple, and your use of those services is governed by their own terms. Keep access to your Google or Apple account secure. You're responsible for activity on your Nerdi account. Tell us at hello@nerdi.app if you think someone else is using it.

3. free games and Nerdi Unlimited

Some games are free for everyone. Others need Nerdi Unlimited, a paid subscription that unlocks every game on the shelf while it is active.

Prices. Nerdi Unlimited is $15/month or $150/year, plus any applicable taxes. The price is shown before you pay.
Automatic renewal. Your subscription renews automatically at the end of each month or year, and the then-current price is charged to your payment method, until you cancel.
Cancelling. You can cancel any time from your account. You keep access until the end of the period you've paid for, and you won't be charged again.
Refunds. Payments are non-refundable and partial periods are not refunded, except where the law requires otherwise. If something has gone wrong, email us and we'll do our best to make it right.
Price changes. We may change prices for future periods. We'll tell you in advance, and you can cancel before the new price applies.
Payments are processed by Stripe, under Stripe's terms.

Which games are free, and which games are on the shelf, may change over time. We may add, update or retire games.

4. using Nerdi

We give you a personal, non-transferable, revocable licence to use Nerdi for your family's own learning or in your classroom, not for resale. Please don't:

copy, download, redistribute or resell the games, their art, voices or music, or share access to paid games with people outside your household;
try to get around the paywall, sign-in or other limits;
disrupt, overload, scrape, or try to break into Nerdi or its systems, or reverse engineer it except where the law allows;
use Nerdi in any way that breaks the law.

5. our content

The games, characters, art, voices, music, text, the Nerdi name and the owl logo belong to Decision Trees Inc. or its licensors and are protected by law. These terms don't give you any rights in them beyond the licence above. Some voices and artwork were made with the help of AI tools and are checked by us before they go on the shelf.

6. learning content

We work hard to make the games accurate and good for learning, but they are games, not a substitute for a teacher or a school curriculum. We don't promise any particular learning result. Please supervise young children's screen time.

7. availability and changes

We aim to keep Nerdi running smoothly, but it may sometimes be unavailable, or a game may not work on every device or browser. We may change, suspend or stop any part of Nerdi. If we stop Nerdi Unlimited altogether, we'll refund the unused part of any prepaid period.

8. ending your use

You can stop using Nerdi at any time and ask us to delete your account. We may suspend or close an account that breaks these terms or that we must close by law. If we close your account for a reason other than a breach of these terms, we'll refund the unused part of any prepaid period.

9. disclaimers

Nerdi is provided "as is" and "as available". To the fullest extent the law allows, we disclaim all warranties, express or implied, including warranties of merchantability, fitness for a particular purpose and non-infringement.

10. limits on our liability

To the fullest extent the law allows, Decision Trees Inc. won't be liable for any indirect, incidental, special, consequential or punitive damages, or for lost data or profits, arising from your use of Nerdi. Our total liability for any claim about Nerdi is limited to the greater of the amount you paid us in the 12 months before the claim and US$50. Some places don't allow these limits, so they may not apply to you, and nothing in these terms limits rights you have as a consumer that can't be waived.

11. your responsibility

If you misuse Nerdi or break these terms and that leads to a claim against us, you agree to cover our reasonable losses and costs from that claim, as far as the law allows.

12. governing law

These terms are governed by the laws of the State of Florida, USA, without regard to its conflict-of-law rules. Any dispute will be resolved in the state or federal courts located in Miami-Dade County, Florida, and you and we consent to their jurisdiction. This doesn't take away any right you have to bring a claim in the courts where you live, if your local consumer law gives you that right.

13. changes to these terms

We may update these terms. We'll change the date at the top, and for significant changes we'll tell account holders in advance by email or on the site. If you keep using Nerdi after a change takes effect, you accept the new terms. If you don't agree, you can cancel and stop using Nerdi.

14. general

These terms and the privacy policy are the whole agreement between you and us about Nerdi. If any part is found unenforceable, the rest still applies. If we don't enforce a term right away, we can still enforce it later. You may not transfer these terms; we may transfer them as part of a merger or sale of the business.

15. contact us

Decision Trees Inc.
Email: hello@nerdi.app