The current version of ALTCHA is v3.3.0 (as of 05/10/2026). patchletter checks the official source daily and emails you new releases.
ALTCHA at a glance
ALTCHA is an open-source, self-hosted alternative to traditional CAPTCHA services. Instead of visual puzzles, the widget hands the browser a compute-bound proof-of-work task whose solution is verified on the server. What makes it attractive to administrators is that it needs no cookies, sends no personal data to third parties and embeds no external scripts, which simplifies privacy-compliant use on sign-in, contact and registration forms.
The project bundles the widget and the server-side verification libraries in a single repository and ships its output as regular releases. Anyone integrating ALTCHA themselves tracks these releases in order to pick up bug fixes and security updates promptly.
When updating, it pays to check compatibility between the widget and the verification library, since the two must work together. Changes to the challenge format or to default parameters should be validated in a staging environment before going live, so existing integrations keep producing valid responses.
Version history & changelog · as detected by patchletter
| Version | Channel | Date | Notes |
|---|---|---|---|
| v3.3.0 | STABLE | 05/10/2026 | Release notes → |
| v3.2.3 | STABLE | 20/09/2026 | Release notes → |
| 3.2.2 | STABLE | 19/08/2026 | Release notes → |
Frequently asked questions
- What is the latest version of ALTCHA?
- ALTCHA v3.3.0, released 05/10/2026. patchletter checks the vendor's official source daily for new releases.
- Where can I find the ALTCHA release notes?
- The version history above links to the vendor's official release notes where the vendor publishes them. patchletter deliberately stores no vendor full texts.
- How do I get notified about new ALTCHA updates?
- Tick ALTCHA off in the catalogue and leave your address. From then on new versions go out by email — one at a time, or bundled in the daily or weekly digest.
An email as soon as a new ALTCHA version ships
We reconcile the vendor source daily. When a new version appears, it lands in your inbox right away or bundled as a digest. The update email is free and ends with one click. Alerts about vulnerabilities and end of support are part of patchletter Pro.
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The badge shows the current ALTCHA version and keeps it up to date. Anyone may embed it, no account needed.
[](https://patchletter.com/en/software/altcha)https://patchletter.com/badge/altcha.svgAlso available: ?v=eol (end of support) and ?v=cve (actively exploited).
