Cheers

Terms of Service

Effective August 11, 2026 · Last updated August 11, 2026

These Terms of Service (“Terms”) are a binding agreement between you and Principle Technologies, Inc., a Delaware corporation (“Cheers,” “we,” “us,” or “our”), governing your use of the Cheers application and related services (the “Service”).

By creating an account or using the Service, you agree to these Terms. If you do not agree, do not use the Service.

Our Privacy Policy explains how we handle your information and is incorporated into these Terms by reference.

1. What Cheers does

Cheers connects to your Gmail account, uses artificial intelligence to identify messages that need your attention, summarizes them for you, and — at your direction — drafts and sends replies from your account. You interact with Cheers over iMessage and through our web application.

2. Eligibility

You must be at least 18 years old and able to form a binding contract to use the Service. If you use the Service on behalf of an organization, you represent that you have authority to bind that organization to these Terms.

3. Your account

You are responsible for maintaining the security of your account and for all activity that occurs under it. Notify us at security@cheers.so if you suspect unauthorized access.

You must provide accurate information and keep it current.

4. Connecting your Google account

The Service requires you to grant Cheers access to your Gmail account through Google OAuth. We request the gmail.modify scope, which permits reading, organizing, composing, and sending mail, and does not permit permanent deletion.

You may revoke this access at any time from within Cheers or at myaccount.google.com/permissions. Revoking access will stop the Service from functioning.

Your use of Gmail remains subject to Google's own terms. Cheers is not affiliated with, endorsed by, or sponsored by Google.

5. Authorization to act on your behalf

This section is important. Please read it carefully.

By connecting your Google account, you authorize Cheers to access your mailbox, to apply and modify labels, to compose messages, and to send email from your account in accordance with your instructions.

Cheers will request your approval before sending an email on your behalf. You are solely responsible for the content of any message sent from your account, whether you composed it yourself or approved a draft Cheers prepared. Review drafts before approving them.

You represent that you have the right to grant this authorization for the mailbox you connect, and that doing so does not violate any agreement or policy that applies to you, including any employer policy governing that account.

6. Artificial intelligence and its limits

Cheers uses large language models to interpret your email and generate drafts. These systems can make mistakes. They can misread intent, misstate facts, mischaracterize urgency, and produce text that appears confident and is wrong.

The Service is a tool to assist you, not a substitute for your own judgment. Do not rely on Cheers for decisions with legal, financial, medical, or otherwise significant consequences without independently verifying the underlying messages.

You are responsible for reviewing what Cheers proposes before you approve it.

7. Messages from Cheers

By providing your phone number, you consent to receive messages from Cheers at that number, including summaries of your email, questions, and service notifications. Message and data rates may apply depending on your carrier and plan.

You can stop receiving messages by replying STOP, by disabling messaging in your account settings, or by deleting your account. Because messaging is how the Service primarily communicates with you, stopping messages will substantially limit its usefulness.

8. Acceptable use

You agree not to:

  • Use the Service for any unlawful purpose, or in violation of any applicable law
  • Use the Service to send spam, bulk unsolicited messages, or deceptive content
  • Connect a mailbox you are not authorized to access
  • Attempt to gain unauthorized access to the Service, other users' accounts, or our systems
  • Probe, scan, or test the vulnerability of the Service without our prior written permission
  • Interfere with or disrupt the Service, including by overloading it
  • Reverse engineer, decompile, or attempt to derive the source code of the Service
  • Use the Service to develop a competing product, or to train a machine learning model
  • Resell, sublicense, or otherwise commercially exploit the Service without our permission

We may suspend or terminate accounts that violate this section.

If you would like to report a security vulnerability, contact security@cheers.so. We welcome good-faith reports and will not pursue action against researchers who act responsibly and give us reasonable time to respond.

9. Fees

The Service is currently provided free of charge. We may introduce fees in the future. If we do, we will give you notice and an opportunity to decline before any charge applies to you.

10. Intellectual property

We own the Service, including its software, design, and content, and all associated intellectual property rights. We grant you a limited, non-exclusive, non-transferable, revocable license to use the Service in accordance with these Terms.

You retain all rights to your own content, including your email and the messages you send. You grant us a limited license to process that content solely to provide the Service to you, as described in our Privacy Policy.

11. Third-party services

The Service depends on third parties including Google, Anthropic, Amazon Web Services, Supabase, Linq, Vercel, and Cloudflare. We are not responsible for their acts or omissions, and interruptions in their services may interrupt ours.

12. Termination

You may stop using the Service and delete your account at any time.

We may suspend or terminate your access at any time if you violate these Terms, if we reasonably believe your use poses a risk to the Service or other users, or if we discontinue the Service.

On termination, we revoke your Google OAuth tokens and delete your data as described in our Privacy Policy. Sections that by their nature should survive termination will survive, including sections 10, 13, 14, 15, and 16.

13. Disclaimers

THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE,” WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS, IMPLIED, OR STATUTORY. WE DISCLAIM ALL IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT.

WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, SECURE, OR ERROR-FREE, THAT DEFECTS WILL BE CORRECTED, OR THAT THE OUTPUT OF THE SERVICE WILL BE ACCURATE OR RELIABLE.

Some jurisdictions do not allow the exclusion of implied warranties, so some of the above may not apply to you.

14. Limitation of liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, NEITHER CHEERS NOR ITS OFFICERS, DIRECTORS, EMPLOYEES, OR AGENTS WILL BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, OR FOR ANY LOSS OF PROFITS, DATA, BUSINESS, OR GOODWILL, ARISING OUT OF OR RELATING TO YOUR USE OF THE SERVICE, WHETHER BASED IN CONTRACT, TORT, OR ANY OTHER THEORY, EVEN IF WE HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

OUR TOTAL LIABILITY FOR ALL CLAIMS RELATING TO THE SERVICE WILL NOT EXCEED THE GREATER OF ONE HUNDRED U.S. DOLLARS ($100) OR THE AMOUNT YOU PAID US IN THE TWELVE MONTHS PRECEDING THE EVENT GIVING RISE TO THE CLAIM.

Some jurisdictions do not allow these limitations, so some of the above may not apply to you.

15. Indemnification

You agree to indemnify and hold harmless Cheers and its officers, directors, employees, and agents from any claims, damages, losses, liabilities, and expenses (including reasonable attorneys' fees) arising out of your use of the Service, your violation of these Terms, your violation of any law, or the content of any message sent from your account.

16. Governing law and disputes

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 Service will be resolved in the state or federal courts located in Santa Clara County, California, and you consent to the personal jurisdiction of those courts.

17. Changes to these Terms

We may update these Terms. If we make a material change, we will notify you by email or in the app before it takes effect and update the date above. Continued use after a change takes effect means you accept the updated Terms.

18. General

These Terms, together with the Privacy Policy, are the entire agreement between you and Cheers regarding the Service. If any provision is found unenforceable, the rest remains in effect. Our failure to enforce a provision is not a waiver of it. You may not assign these Terms without our written consent; we may assign them in connection with a merger, acquisition, or sale of assets.

19. Contact

Principle Technologies, Inc.
3454 Chieri Place, San Jose, CA 95148

General: support@cheers.so
Security: security@cheers.so