The current version of Cap is 3.1.13 (as of 23/09/2026). patchletter checks the official source daily and emails you new releases.
Cap at a glance
Cap is a lightweight, open-source alternative to services such as reCAPTCHA or hCaptcha. Instead of image puzzles, Cap gives the browser a proof-of-work task and adds unobtrusive behavioural checks to tell automated requests apart from real users. For administrators, the bundled standalone server is the interesting part: it runs as a small Docker container and works without external dependencies or telemetry.
The project is organised as a monorepo, with the self-hosted server and the client-side widget library released separately. For an update radar, the standalone server is what matters, and its output appears as its own release line.
When updating, it helps to distinguish server releases from widget releases, since the two follow different version lines. Before switching, it is worth reviewing possible changes to configuration and API behaviour so that bot protection on existing forms keeps running without interruption.
Version history & changelog · as detected by patchletter
| Version | Channel | Date | Notes |
|---|---|---|---|
| 3.1.13 | STABLE | 23/09/2026 | Release notes → |
| 3.1.12 | STABLE | 23/09/2026 | Release notes → |
| 3.1.11 | STABLE | 04/09/2026 | Release notes → |
| 3.1.8 | STABLE | 22/07/2026 | Release notes → |
| 3.1.7 | STABLE | 15/07/2026 | Release notes → |
| 3.1.6 | STABLE | 15/07/2026 | Release notes → |
| 3.1.5 | STABLE | 08/06/2026 | Release notes → |
| 3.1.3 | STABLE | 06/06/2026 | Release notes → |
| 3.1.2 | STABLE | 13/05/2026 | Release notes → |
Frequently asked questions
- What is the latest version of Cap?
- Cap 3.1.13, released 23/09/2026. patchletter checks the vendor's official source daily for new releases.
- Where can I find the Cap 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 Cap updates?
- Tick Cap 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 Cap 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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[](https://patchletter.com/en/software/cap)https://patchletter.com/badge/cap.svgAlso available: ?v=eol (end of support) and ?v=cve (actively exploited).
