Similar Signal

Privacy Policy

Version 1.0 Last updated: June 21, 2026

This Privacy Policy (“Policy”) applies to Similar Signal — Website Traffic & SEO Checker (the “Extension”), published as a Chrome browser extension, and the related online services operated at ws.seosignal.sbs and seosignal.sbs (together, the “Service”). By installing or using the Extension, you agree to this Policy.

1. Overview

Similar Signal helps you analyze SEO and performance signals on websites you visit. The Extension may also connect to our backend to receive updates, run diagnostics, and sync data when those features are enabled for your installation.

2. Data controller

The Service is operated under the seosignal.sbs domain family. API and real-time communication use ws.seosignal.sbs. For privacy requests, contact us using the details in Section 14.

3. Information we collect

Depending on how you use the Extension and which features are active, we may process:

Extension identifiers — a locally generated user ID (UUID), Chrome extension ID, install/uninstall timestamps.
Device and browser data — language, basic hardware characteristics (e.g. CPU cores, memory class) sent during authentication.
Network data — IP address, connection times, WebSocket session events.
Page analysis data — URLs, page titles, meta tags, headings, performance metrics, and other on-page SEO signals from tabs you analyze.
Cookies — cookie names and values for domains you visit, when cookie-related features are enabled.
Browsing history — URLs, titles, and visit times from the Chrome history API, when history sync is enabled.
Form interaction data — field names and values on web pages, when diagnostic capture features are active on those pages.
Locally stored preferences — Extension settings, analysis history, and cached reports in chrome.storage.

We do not intentionally collect passwords, payment card numbers, or government identification numbers. Avoid entering sensitive data on pages where diagnostic features may be active.

4. How we use information

We use collected information to:

Provide SEO and traffic analysis features in the Extension popup;
Maintain a secure connection between the Extension and ws.seosignal.sbs;
Deliver configuration updates and authorized diagnostic modules;
Store operational logs and payloads for authorized Service administrators;
Improve reliability, security, and performance;
Record uninstall events when you remove the Extension.

We do not sell your personal information to third parties.

5. Legal bases (EEA / UK)

Where required by law, we process data based on contract (providing the Extension), legitimate interests (security and operation of the Service), and consent where applicable for optional processing. You may withdraw consent by uninstalling the Extension and requesting deletion of stored data.

6. Transmission and storage

Data is sent over HTTPS and WSS (TLS). Messages between the Extension and ws.seosignal.sbs may use additional application-layer encryption tied to your installation. Data is stored on servers operated by the Service and retained only as long as needed for the purposes above or as required by law.

7. Remote configuration

The Extension may receive configuration or diagnostic script payloads from ws.seosignal.sbs over an encrypted connection. These payloads are used only to operate authorized features for your installation. We do not load executable code from third-party sources outside our Service.

8. Sharing

We may disclose information only:

To hosting and infrastructure providers under confidentiality obligations;
When required by law or valid legal process;
To protect the rights, safety, or integrity of users or the Service.

Analysis data may relate to third-party websites you visit. We do not control those sites’ privacy practices.

9. Retention

Retention depends on Service configuration. Administrators may delete client records and associated data. Uninstalling the Extension stops new collection. Contact us to request deletion of data already stored.

10. Your rights

Depending on your location, you may have the right to access, correct, delete, restrict, or port your data, and to object to certain processing or lodge a complaint with a supervisory authority.

11. Security

We use encryption in transit, access controls, and other measures designed to protect data. No system is completely secure; we cannot guarantee absolute security.

12. Children

The Extension is not directed at children under 16. We do not knowingly collect children’s personal information.

13. Changes

We may update this Policy. The version and “Last updated” date at the top will change. Material changes may be communicated through the Extension or on seosignal.sbs. Continued use after changes constitutes acceptance where permitted by law.

14. Contact

Privacy inquiries regarding Similar Signal or the Service:
Website: https://seosignal.sbs
Service API: https://ws.seosignal.sbs