Terms of Service — Rootlette

Last updated: 2026-08-11

These Terms of Service ("Terms") govern your access to and use of the Rootlette mobile application (the "App"), published by Lightbulb Labs LLC, a California limited liability company ("Lightbulb Labs", "we", "us", "our"). By downloading, installing, or using the App, you agree to be bound by these Terms. If you do not agree, do not use the App.

1. Eligibility

You must be at least 13 years old to use the App. By using the App, you represent that you meet this requirement and have the legal capacity to enter into these Terms.

2. What the App is

Rootlette is an educational vocabulary app that teaches English words through their Latin and Greek roots. It is provided for general learning and self-study. We work to keep the etymologies, definitions, and example sentences accurate, but we make no guarantee that any content is complete, error-free, or authoritative, and the App is not a substitute for a dictionary, a teacher, or a course. We do not promise any particular outcome from using the App, including any result on a test or examination.

3. Your content and progress

Your learning progress, review history, streaks, and settings ("User Content") belong to you. As described in our Privacy Policy, User Content is stored locally on your device — there are no accounts and no Lightbulb Labs server, and we do not access, view, or store it. You are solely responsible for backing up your own device if you want a copy of your progress preserved beyond that device. Uninstalling the App, resetting your progress, or losing your device will lose that progress permanently.

4. Ads

The App is free and supported by advertising. An interstitial ad appears between words after every few words you complete. There are no purchases, subscriptions, or paid tiers in the App, and no content is locked behind payment — ads affect how quickly you can move through a session, never whether content is available to you.

Ads are supplied by a third-party advertising provider. We do not create, endorse, or control advertisements or the products, services, or websites they promote, and we are not responsible for them or for any dealing you have with an advertiser. As described in our Privacy Policy, we request non-personalized ads only.

5. License to use the App

Subject to your compliance with these Terms, Lightbulb Labs grants you a limited, non-exclusive, non-transferable, revocable license to download and use the App on a device you own or control, for your own personal, non-commercial use.

6. Acceptable use

You agree not to:

• Use the App for any unlawful purpose or in violation of these Terms.
• Reverse engineer, decompile, or disassemble the App, except where applicable law permits it despite this restriction.
• Extract, copy, scrape, or redistribute the App's word curriculum, etymology content, or example sentences, in whole or in substantial part.
• Modify, adapt, or create derivative works based on the App.
• Interfere with the App's advertising, or attempt to generate invalid ad impressions or clicks.
• Interfere with or disrupt the App's operation or attempt to gain unauthorized access to any systems related to it.
• Use the App in any way that infringes the rights of others.

7. App stores and third-party platforms

The App is distributed through the Apple App Store and/or Google Play. Your download and use of the App is also subject to the usage terms of the applicable app store. If there's a conflict between those terms and these Terms with respect to your use of the platform itself (as opposed to the App), the platform's terms control. Apple and Google are not responsible for the App or its content, and have no obligation to furnish maintenance or support for the App.

8. Intellectual property

The App and all content and technology it incorporates — including its curriculum, etymology writing, example sentences, puzzles, design, text, graphics, logos, and code, and the Rootlette and Lightbulb Labs names and marks — are owned by Lightbulb Labs or its licensors and protected by intellectual property laws. Except for the license in Section 5, no rights are granted to you in the App.

9. Feedback

If you send us suggestions, ideas, or other feedback about the App, you grant us a non-exclusive, worldwide, royalty-free, perpetual, irrevocable license to use that feedback for any purpose, without any obligation to you.

10. Disclaimers

THE APP IS PROVIDED "AS IS" AND "AS AVAILABLE," WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS, IMPLIED, OR STATUTORY, INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE APP WILL BE UNINTERRUPTED, ERROR-FREE, OR SECURE, THAT ANY PROGRESS OR DATA WILL BE PRESERVED WITHOUT LOSS, OR THAT THE APP'S EDUCATIONAL CONTENT IS ACCURATE, COMPLETE, OR SUITABLE FOR ANY PARTICULAR PURPOSE.

11. Limitation of liability

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT WILL LIGHTBULB LABS OR ITS OFFICERS, MEMBERS, EMPLOYEES, OR AGENTS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS, REVENUE, DATA, PROGRESS, OR GOODWILL, ARISING OUT OF OR RELATED TO YOUR USE OF, OR INABILITY TO USE, THE APP, WHETHER BASED ON WARRANTY, CONTRACT, TORT, OR ANY OTHER LEGAL THEORY, AND WHETHER OR NOT WE HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

IN ANY EVENT, LIGHTBULB LABS' AGGREGATE LIABILITY ARISING OUT OF OR RELATED TO THESE TERMS OR THE APP WILL NOT EXCEED ONE HUNDRED U.S. DOLLARS (US $100).

12. Indemnification

You agree to defend, indemnify, and hold harmless Lightbulb Labs and its officers, members, employees, and agents from and against any claims, liabilities, damages, losses, and expenses (including reasonable attorneys' fees) arising out of or in any way connected with your access to or use of the App or your violation of these Terms.

13. Term, termination, and discontinuation

These Terms remain in effect while you use the App. We may suspend or terminate your access to the App at any time, with or without notice, including if we believe you've violated these Terms. We may also modify, suspend, or discontinue the App, in whole or in part, at any time. You may stop using the App at any time by uninstalling it. Sections that by their nature should survive termination — including intellectual property, disclaimers, limitations of liability, and indemnification — will survive.

14. Governing law and venue

These Terms are governed by the laws of the State of California, without regard to its conflict-of-laws principles. Any dispute arising out of or relating to these Terms or the App will be resolved exclusively in the state or federal courts located in Sacramento County, California, and you consent to the personal jurisdiction of those courts.

15. Changes to these terms

We may revise these Terms at any time by posting an updated version on this page and revising the "Last updated" date. Your continued use of the App after changes are posted constitutes your acceptance of the revised Terms.

16. Miscellaneous

These Terms, together with our Privacy Policy, constitute the entire agreement between you and Lightbulb Labs regarding the App. If any provision is held invalid or unenforceable, the remaining provisions remain in full force and effect. Our failure to enforce any right or provision is not a waiver of that right or provision. You may not assign these Terms without our prior written consent; we may assign them freely.

Contact

Questions about these Terms can be sent to contact@lightbulblabs.net or by mail to:

Lightbulb Labs LLC
2108 N St Ste N
Sacramento, CA 95816