Privacy Policy — Formulint

Last updated: November 6, 2026

Summary: Formulint works offline. Your formulas, history and settings stay on your device. The only thing that ever leaves it is feedback you choose to send.

Data Collection

We collect nothing automatically. The extension does not:

Send your formulas, history or settings anywhere
Track usage, analytics, or telemetry
Access your browsing history, tabs, or web page content
Require an account or login

Feedback You Send

Only when you open Send feedback and press the send button, the extension sends to our feedback service (a Cloudflare Worker operated by t-epstudio.com):

your message and the category you picked;
your email address — only if you turn off "Send anonymously" and type one;
the formula on screen — only if you turn on "Attach the current formula";
the extension version, browser, operating system and UI language.

The service stores this to read and answer your feedback, and emails a copy to formulint-support@t-epstudio.com. Your IP address is not stored; only a salted one-way hash of it, used to limit spam. Your email is used only to reply, never for marketing. Ask at formulint-support@t-epstudio.com to have your feedback deleted.

Data Storage

The extension stores the following locally on your device only using Chrome's storage.local API:

Data	Purpose
Formula history (text strings you paste)	So you can revisit recent formulas
UI preferences (theme, language, zoom level)	To remember your settings between sessions

This data never leaves your browser. You can clear it at any time by clicking History → Clear inside the extension, or by removing the extension.

Permissions Explained

Permission	Why it's needed
`storage`	Save your formula history and preferences locally
`windows`	Open Formulint in its own window when you click the toolbar icon

Third Parties

No analytics, tracking or advertising. Feedback you choose to send is processed by Cloudflare (hosting) and Resend (email delivery) on our behalf.

Changes

If the privacy policy changes in a material way, the extension version will be updated and this document will reflect the new date.

Contact

Questions? Email formulint-support@t-epstudio.com.