Terms
Last updated: 14 November 2026
These terms apply to the Sounday website, API, MCP server, CLI and integrations (the “service”). By creating an API key or using the service you agree to them.
The service
Sounday checks writing style and rewrites text so it reads more naturally, and verifies that names, numbers, dates and claims are preserved. Verification uses automated checks and can miss things: review important content before you publish it. You are responsible for the content you send and publish.
We do not promise any particular outcome from third-party AI detectors, search engines or platforms. Scores we show are our own style analysis, not a statement about who or what wrote a text.
Acceptable use
You may not use the service to:
- submit academic work as your own where your institution prohibits AI assistance;
- produce spam, fake reviews, or content that impersonates real people or organisations;
- deceive people in ways that cause harm, including fraud, scams and disinformation;
- process content that is illegal, or that you have no right to use;
- resell raw API access, share keys publicly, or try to get around plan limits or rate limits.
We may suspend keys that break these rules or put the service at risk.
Accounts, plans and billing
- Keep your API key secret; you are responsible for usage made with it. Rotate it from your account page if it leaks.
- Paid plans renew monthly through Stripe until cancelled. Cancelling keeps your plan until the end of the paid period.
- Plan limits reset on the 1st of each month (UTC). Unused words do not roll over.
- If something went wrong with a charge, contact us within 14 days and we will make it right.
- We may change prices with at least 30 days' notice by email; changes apply from your next billing period.
Your content
You keep all rights to the text you send and to the rewrites you receive. We process your text only to provide the service and do not store it (see Privacy).
Availability and liability
We work to keep the service available and correct, but it is provided “as is”, without warranties of any kind. To the extent the law allows, our total liability for any claim is limited to the amount you paid us in the three months before the claim.
Changes
We may update these terms. Material changes are announced by email to account holders at least 14 days before they apply.