Terms of use
1. Who we are
Gradara is developed and Gradara AI credits are sold by Virtu Services LLC, a Wisconsin limited liability company ("we"). These terms cover your use of the Gradara AI service and credit purchases. The Gradara app's source code is licensed separately under the Apache License 2.0, which governs your use, modification, and distribution of the software. Our privacy notice explains how we handle data.
2. Accepting these terms
By signing in to Gradara AI or buying credits you agree to these terms. When you sign in we record which version of these terms was shown to you. If we change them, we will post the new version here with a new date; signing in again or continuing to use Gradara AI after that means you accept the new version.
3. Who can use Gradara AI
- You must be at least 16 years old to use Gradara AI, and at least 18 (or the age of majority where you live) to buy credits.
- If you use Gradara AI for an organization, you confirm that you may accept these terms for it.
- You may not use Gradara AI if you are located in, or ordinarily resident in, a country or region under comprehensive U.S. sanctions, or if you are on a U.S. government list of restricted or blocked parties. You are responsible for complying with export control and sanctions laws that apply to your models, generated code, and how you use them.
4. Accounts
You need an account with a verified email to use Gradara AI. Keep your sign-in secure and tell us if you believe it was misused. One person or organization per account. Welcome credits are limited to one grant per person: an account created again after deletion, with the same sign-in or email, starts without welcome credits.
5. Credits
- Credits are prepaid and used for Gradara AI operations at the prices shown in the app when you start the operation.
- Each operation has a listed price in credits, shown in the app before you send it. Automatic repair attempts are included. Model edits add a per-block price for each new or rewritten block, a fix costs the explanation plus the edit, a question about your results includes the extra measurements the AI asks for, and a question asked in Edit model is answered at the edit price.
- Failed operations are never charged. If an operation, or a priced part of it, fails before returning a result, for any reason, its credits are returned to your balance automatically.
- Credits do not expire while your account is active. They are not cash, have no value outside Gradara AI, and cannot be transferred.
- We may change credit prices for future operations and purchases, with notice in the app.
6. Refunds
- Within 14 days of a purchase, we refund the unused credits from that purchase on request. Email support@virtu-services.us from your account email. Credits you have already used are not refunded. Welcome credits have no cash value and are never refunded.
- When a payment is refunded or charged back through Stripe, the credits it bought are removed from your balance, up to the credits you have not yet used. Your balance never goes below zero because of this.
- If we discontinue Gradara AI, we will give reasonable notice and refund unused purchased credits.
- These rules do not limit any rights you have under the law where you live.
7. Acceptable use
Use Gradara AI for engineering modeling. Do not attempt to access the service other than through Gradara, circumvent limits or billing, resell access, disrupt the service, or submit content you do not have the right to use.
8. Your content and AI output
You keep all rights to your models and the content you submit. You may use generated blocks, models, and code for any purpose, subject to these terms and the terms of our AI model provider, Anthropic.
AI output can be wrong. Compiler checks confirm that output is valid Modelica or C, not that it is physically accurate, safe, or fit for a purpose. You are responsible for reviewing and validating any model, simulation, or code before relying on it. Explanations of your results can be wrong even when the numbers they quote were checked against your data.
Personal features. Personal features are built in a GitHub repository you choose, under GitHub's terms, and paid for by that repository's own AI account. They are not part of Gradara AI and use no credits. They are AI-written code that passed automated checks; we do not review them. They run on your computer with your permissions, and sections 8, 9, and 11 apply to them.
9. Not for safety-critical use
Gradara, Gradara AI, and the models, simulation results, and code they produce are not certified, qualified, or validated for safety-critical use. Do not use them as the basis for decisions or products where a failure could cause death, injury, or serious damage to property or the environment, such as medical devices, aviation, automotive safety functions, nuclear facilities, rail signalling, or industrial safety systems, unless you independently verify and qualify them under the standards that apply to that use.
10. Availability
We work to keep Gradara AI available but do not guarantee uninterrupted service. We may change or discontinue features.
11. Disclaimer and limitation of liability
The app and Gradara AI are provided "as is", without warranties of any kind, to the extent permitted by law. Our total liability for any claim related to Gradara AI is limited to the amount you paid us in the twelve months before the claim.
12. Ending your account
You may delete your account at any time in the app (Settings → AI). Deleting it forfeits any credits left in it. If you want unused purchased credits refunded under section 6, ask us before you delete the account. We may suspend accounts that violate these terms; unused credits in an account suspended for violations are forfeited.
13. Governing law
These terms are governed by the laws of the State of Wisconsin, USA.
14. Contact
Virtu Services LLC · support@virtu-services.us