Privacy Policy

Last updated: August 2026

      The short version: Tono does not collect, store, or transmit your emails or personal data to any Tono server. Ever.
    

What Tono does

Tono is a Chrome extension that analyzes the tone and clarity of emails you write in Gmail. You choose a recipient type and desired tone, and the extension sends your email draft to your chosen AI provider (Anthropic, OpenAI, or Google) for analysis.

Data we collect

Tono does not operate any servers and does not collect any personal data. Specifically:

Your emails — never stored or logged by Tono. They are sent directly from your browser to your chosen AI provider and nowhere else.
Your API key — stored locally in your browser using Chrome's chrome.storage.sync API. It is never transmitted to Tono.
Your identity — Tono does not require an account, login, or any personal information.
Usage data — Tono does not track how often you use it, what emails you write, or any analytics.

Third-party AI providers

When you click Analyze, your email content is sent directly from your browser to whichever AI provider you have selected:

Anthropic (Claude) — privacy policy
OpenAI (ChatGPT) — privacy policy
Google (Gemini) — privacy policy

Each provider has their own data retention and privacy policies. We recommend reviewing them before use. Your API key usage is subject to each provider's terms of service.

Permissions

Tono requests the following Chrome permissions:

activeTab — to read the email content from the Gmail compose window you are currently using.
storage — to save your API key and provider preference locally in your browser.
scripting — to inject the Tono interface into the Gmail page.
host permissions for mail.google.com — to operate within Gmail.
host permissions for AI provider APIs — to send your email to the AI for analysis.

Children's privacy

Tono is not directed at children under 13 and does not knowingly collect data from children.

Changes to this policy

If this policy changes materially, we will update the date at the top of this page. Continued use of the extension constitutes acceptance of the updated policy.

Contact

Questions about this policy? Reach out via the Chrome Web Store support tab on the Tono listing page.