Privacy Policy

Last updated: June 24, 2026

What Dia does

Dia Reader is a browser extension that lets you highlight text on any web page and instantly look up what it means — definitions, context, and plain-language explanations. It runs on an online service we operate; you do not need to provide any keys.

Data we process

Account. If you sign in, we store your email address and verification history to recognise you. Sign-in uses a one-time emailed code; we do not store passwords.
The text you look up. When you request a lookup, the highlighted text and your request are sent to our backend, which forwards them to a third-party text-processing provider (OpenRouter) to produce your explanation. We log usage volume and cost per request for billing and capacity planning. We do not sell your data.
Usage counts. Per-device and per-account counters enforce the free-lookup limit and your plan.
Analytics. We use Mixpanel for anonymous product-usage events (e.g. app opened, lookup requested, explanation shown). These contain counts, sizes, and timings only — never your highlighted text or the explanations shown.
Payments. Billing is handled by Paddle, our payment processor and merchant of record. Card details are entered on Paddle's checkout and are never seen or stored by us.

Where data goes

Our backend (hosted by us) — receives the text you look up and account/usage data.
OpenRouter — produces the text explanation.
Resend — sends your sign-in code email.
Mixpanel — anonymous usage events.
Paddle — processes payments.

Your choices

You can use Dia without signing in until your free lookups are used up. You can sign out at any time from the side panel, which clears your session. To request account or data deletion, contact us at support@naturaldevs.com.

Contact

Questions about this policy: support@naturaldevs.com.