Please read these documents carefully. By using Zeretis you agree to the Terms of Service. Our Privacy Policy explains exactly what data we collect and how we use it.
Last updated: March 26, 2026By accessing or using the Zeretis solver ("Service"), you agree to be bound by these Terms of Service ("Terms"). If you do not agree, do not use the Service.
These Terms apply to all users, including free accounts, paid subscribers, API users, students, teachers, and parents acting on behalf of minor children.
Zeretis provides a deterministic symbolic mathematics solver accessible via web browser and API. The solver processes mathematical expressions and returns exact, step-by-step solutions.
We reserve the right to modify, suspend, or discontinue any part of the Service at any time with reasonable notice where possible.
A Google account is required to use Zeretis — including the free tier. We use it only to track anonymous usage counts to enforce the monthly limit. No query content is stored. You are responsible for maintaining the security of your account and for all activity that occurs under it.
Users under 13 must have parental consent. Parents and guardians who create or authorize accounts for minors take full responsibility for that minor's use of the Service. We do not knowingly collect personal information from children under 13 without verified parental consent.
Paid subscriptions are processed by Paddle, our Merchant of Record. By subscribing you also agree to Paddle's terms of service. Zeretis does not store your payment card details.
You agree not to:
The Zeretis solver engine, website, branding, and all associated software remain the property of Zeretis. You retain ownership of any mathematical expressions you input.
Solver outputs (solutions, steps, results) may be used freely for personal, educational, or commercial purposes. You may not resell solver outputs as a standalone product.
The Service is provided "as is" without warranties of any kind. While the solver produces mathematically exact results for well-formed inputs, Zeretis makes no warranty regarding fitness for a particular purpose.
Do not rely solely on solver output for safety-critical engineering, medical, or legal decisions. Always verify results through appropriate professional channels.
To the maximum extent permitted by law, Zeretis shall not be liable for any indirect, incidental, special, or consequential damages arising from your use of the Service.
Our total liability to you for any claim shall not exceed the amount you paid to Zeretis in the 12 months preceding the claim.
We may suspend or terminate your account for material violation of these Terms. You may delete your account at any time via the Manage Account page. Active subscriptions will be cancelled and any remaining access period honoured upon your request.
We may update these Terms from time to time. We will notify you of material changes via email or an in-app notice. Continued use of the Service after changes take effect constitutes acceptance of the updated Terms.
For questions about these Terms, contact us at legal@zeretis.com or via our contact page.
This Privacy Policy explains what information Zeretis collects, how it is used, and your rights regarding that information. We are committed to transparency and to collecting only what we need.
When you sign in with Google, we receive your email address and display name from Google's OAuth service. We do not receive your Google password.
We log your monthly solve count associated with your account, to enforce the free tier limit. We do not log or store the content of your mathematical queries.
Standard server logs including IP address, browser type, and timestamps. Used for security monitoring and not linked to your identity.
We do not sell, rent, or trade your personal data. We share data only in these limited circumstances:
All payment processing is handled by Paddle, our Merchant of Record. Paddle stores your billing information, processes charges, and handles tax compliance across jurisdictions. Zeretis never sees or stores your card number, CVV, or full billing address.
Paddle's privacy policy is available at paddle.com/legal/privacy.
Zeretis is designed to be safe for students of all ages when used under appropriate supervision. We do not knowingly collect personal information from children under 13 without verified parental consent.
If you are a parent or guardian and believe your child has provided personal information without your consent, please contact us immediately at privacy@zeretis.com and we will delete it promptly.
We retain your account data for as long as your account is active. If you delete your account, we will delete your personal data within 30 days, except where retention is required by law.
You can delete your account at any time from the Manage Account page.
Depending on your jurisdiction, you may have the right to:
To exercise any of these rights, contact us at privacy@zeretis.com.
We use industry-standard security practices including encrypted connections (HTTPS), access controls, and regular security reviews. No system is 100% secure — if you suspect unauthorized access to your account, contact us immediately.
Privacy questions: privacy@zeretis.com
General contact: zeretis.com/contact
If anything in these documents is unclear, reach out and we'll explain it in plain English.
Contact us