Terms of Service

1 Who we are

Sylvia is an independent software product.

2 Accepting these terms

By installing the Extension, creating an account, or purchasing credits, you confirm that you are at least 13 years old and have the legal capacity to enter into a binding agreement. If you are using Sylvia on behalf of an organisation, you represent that you have authority to bind that organisation to these Terms.

3 The service

Sylvia is a Chrome extension that integrates with your Gmail account to help you manage your inbox using AI. It is provided in two tiers:

• Free plan. AI features are powered by an API key you supply from a third-party provider (OpenAI, Google Gemini, or Azure OpenAI). Your requests go directly from your browser to that provider; our servers are not involved.
• Paid Sylvia AI plan. AI replies are powered by prepaid credits. Requests are routed through our server proxy to Cerebras AI on your behalf.

4 Paid plan & credits

AI reply credits ("credits") are prepaid units that entitle you to use the Sylvia AI paid plan. Each credit corresponds to one AI-generated reply. There are no subscriptions or automatic renewals — every purchase is a one-time transaction and you are charged only when you explicitly choose to buy.

• No subscriptions or automatic charges. Sylvia does not offer subscription plans. You will never be charged automatically. Credits are purchased on demand, one transaction at a time.
• Credits do not expire. Purchased credits remain valid on your account indefinitely, unless your account is terminated for a violation of these Terms.
• Credits are non-transferable. Credits are tied to your account and cannot be transferred to another user.
• Credits are consumed on use. A credit is deducted each time an AI reply is successfully generated. Credits are not deducted for failed or error responses.
• Account deletion and data erasure. If you request deletion of your account data under these Terms or under applicable data protection law, any remaining credit balance will be permanently erased. This erasure does not entitle you to a refund of unused credits.

5 Payments & refunds

All payments are processed by Stripe. By completing a purchase you agree to Stripe's terms of service. We do not store your card details.

• Pricing. Credit prices are displayed at checkout and are inclusive of any applicable VAT. We reserve the right to change prices at any time; price changes do not affect credits already purchased.
• No refunds. All purchases of credits are final and non-refundable. This applies to unused credits, credits forfeited on account deletion, and credits consumed by AI calls that produced a response (even if you were not satisfied with the output).
• Exceptions. Nothing in these Terms limits any rights you may have under mandatory EU consumer protection law that cannot be contractually excluded.
• Right of withdrawal. Under EU Directive 2011/83/EU, the 14-day right of withdrawal for digital services does not apply once the service has begun with your prior express consent and acknowledgement that you thereby lose your right of withdrawal. By completing a purchase and using credits, you confirm this consent.

6 Acceptable use

You agree to use Sylvia only for lawful purposes and in accordance with these Terms. In particular, you must not:

• Use the Service to send spam, unsolicited bulk messages, or any communication that violates applicable law.
• Attempt to circumvent rate limits, authentication, or any other technical restriction of the Service.
• Reverse-engineer, decompile, or otherwise attempt to extract the source code of the Extension beyond what is permitted by applicable law.
• Use the Service in a way that could damage, disable, or impair our infrastructure or that of any third-party provider.
• Use the Service to process the personal data of third parties without a lawful basis under the GDPR or other applicable data protection law.
• Resell, sublicense, or otherwise provide access to the Service to third parties without our prior written consent.

We reserve the right to suspend or terminate your access if we reasonably believe you are in breach of this section.

7 Intellectual property

Sylvia and all associated software, branding, and content are owned by us or our licensors. These Terms do not transfer any intellectual property rights to you. You are granted a limited, non-exclusive, non-transferable licence to use the Extension solely for its intended purpose.

AI-generated content produced by the Service is returned to you as output. We make no claim of ownership over replies generated on your behalf.

8 Disclaimers

To the maximum extent permitted by applicable law:

• The Service is provided "as is". We do not warrant that the Service will be uninterrupted, error-free, or always available. We may suspend the Service for maintenance at any time.
• AI output accuracy. AI-generated replies are produced by third-party models (Cerebras AI on the paid plan, or your configured provider on the free plan). We do not guarantee the accuracy, completeness, or fitness for purpose of any AI-generated content. You are responsible for reviewing and approving any reply before sending.
• Third-party services. Sylvia depends on Google's Gmail API, Stripe, Cerebras AI, and other third-party services. We are not responsible for any interruption or failure of those services.

9 Limitation of liability

To the maximum extent permitted by EU and applicable national law, our total liability to you for any claim arising out of or in connection with these Terms or the Service shall not exceed the total amount you paid for credits in the 12 months preceding the claim.

We shall not be liable for any indirect, incidental, consequential, or punitive damages, including but not limited to loss of data, loss of profits, or reputational harm, even if we have been advised of the possibility of such damages.

Nothing in these Terms excludes or limits liability for death or personal injury caused by negligence, fraud, or any other liability that cannot be excluded under mandatory EU law.

10 Account termination

• By you. You may stop using the Service at any time by uninstalling the Extension. Any remaining credit balance will be permanently erased without refund.
• By us. We may suspend or terminate your access immediately if you breach these Terms, in particular the Acceptable Use provisions. We will provide notice where reasonably practicable. Termination for breach does not entitle you to a refund of any credits.
• Effect of termination. Upon termination, your right to use the Service ceases. Sections 7 (Intellectual property), 8 (Disclaimers), 9 (Limitation of liability), and 12 (Governing law) survive termination.

11 Changes to the service and these terms

We may modify the Service or these Terms at any time. For material changes, we will provide at least 30 days' notice by updating the "last updated" date on this page and, where reasonably practicable, by notifying you via the Extension or by email.

Continued use of the Service after the effective date of any change constitutes your acceptance of the revised Terms. If you do not agree to a change, you must stop using the Service before the change takes effect.

12 Governing law & disputes

These Terms are governed by and construed in accordance with the laws of the European Union and, where applicable, the national law of the member state of establishment. Any dispute arising out of or in connection with these Terms shall be subject to the exclusive jurisdiction of the competent courts of that member state, without prejudice to your rights as an EU consumer to bring proceedings in your country of residence.

If you are an EU consumer, you also have the right to use the European Commission's Online Dispute Resolution platform to resolve disputes out of court.

13 Contact

For privacy-related enquiries, refer to our Privacy Policy.