Last updated: 11 July 2026
Seenly is a free email open-tracking extension for Gmail. This policy explains exactly what data Seenly collects, why, and your rights over it. We keep it short because Seenly collects very little.
| Data | Why |
|---|---|
Your Google account ID (Firebase uid) and email address |
To sign you in and show only your own tracked emails. |
| For each email you choose to track: the subject, recipient address, and send time | To display your list of tracked emails and their read status. |
| Open events: a timestamp, the requesting user-agent, and IP address of the device that loaded the tracking pixel | To tell you when (and roughly how often) your email was opened. |
When you send a tracked email, Seenly embeds a single invisible 1×1 pixel image. When the recipient's email client loads that image, our server records an open event. Mail providers sometimes pre-fetch images for caching; Seenly filters out those delivery-time pre-fetches so they are not reported as opens.
Data is stored in Google Firebase (Firestore) and protected by security rules so that only you can read your own tracked emails and open events. The tracking pixel is served from Firebase Hosting / Cloud Functions.
If you are in the EEA/UK, our legal basis for processing is your consent (you install the extension and choose which emails to track) and our legitimate interest in providing the service you requested. You have the right to access, correct, export, or delete your data at any time. Deleting a tracked email in the extension removes its record; signing out and uninstalling stops all collection. To request full deletion of your account data, email privacy@seenly.app.
Emails you send may include a small “Sent with Seenly” footer (which you can toggle off) so recipients are aware tracking may be in use. You are responsible for complying with the laws that apply to you when tracking email opens.