AltCatch — Privacy Policy
Effective date: 18 May 2026
Applies to: the AltCatch Chrome Extension and the toolk.site/altcatch product surfaces.
Short version
AltCatch runs 100% inside your browser. We do not collect, transmit, store, or sell any of your data. No accounts. No analytics. No telemetry. No external servers.
What AltCatch reads
When you run an audit, AltCatch reads from the page you choose to audit:
<img>elements and theiraltattributes- Image source URLs (the
srcattribute and resolved URL) - The page's title, URL, and origin (so the report knows what it audited)
This information is processed in memory inside your browser and rendered into the AltCatch UI. It is never sent to any server we control — we operate no servers.
What AltCatch stores
AltCatch uses Chrome's local storage API (chrome.storage.local) to keep your audit history on your device, so you can revisit prior audits. This data:
- Lives only on your computer, in your Chrome profile
- Is not synced to any cloud or third party
- Can be erased at any time by removing the extension or clearing Chrome's storage for AltCatch
What AltCatch exports
When you click Export to Markdown or Copy to clipboard, the report is generated locally and saved to your device (downloads folder or clipboard). Nothing is uploaded.
Network activity
AltCatch makes one type of outbound request: lightweight HTTP HEAD requests to the same image URLs the page you're auditing already loads. These verify whether an image resolves (200) or is broken (404 / network error). The request goes from your browser directly to the image's host — exactly as the page itself does — and AltCatch never proxies, logs, or stores the response anywhere off-device.
AltCatch does not load remote code. All scripts ship inside the extension package.
Permissions and why
| Permission | Purpose |
|---|---|
| activeTab | Read the DOM of a page you choose to audit when you click the toolbar icon. |
| scripting | Inject the image-scanning script into that page. |
| storage | Save your audit history locally on your device. |
| sidePanel | Render the AltCatch UI inside Chrome's side panel. |
Third parties
None. AltCatch does not integrate with any analytics, advertising, error-reporting, or third-party SDK.
Children's privacy
AltCatch is a developer tool and is not directed at children. We do not collect any data, from anyone, so no special children's-data handling applies.
Changes to this policy
If AltCatch's data practices change in a future release (for example, when sitemap-driven full-site auditing ships), this policy will be updated with a new effective date and the changes summarised at the top. Continued use after an update means you accept the revised policy.
Contact
Questions about this policy or AltCatch's privacy practices: hello@mhtawfik.com
AltCatch is published by Soft Web Grove.