ALTCHA vs Cap

ALTCHA vs Cap
Fact	ALTCHA	Cap
Language	TypeScript	JavaScript
Licence	MIT	Other
Stars	2.8k	7.9k
Latest	v3.3.0	standalone@3.1.13
Last push	2026-10-05	2026-10-04
Release cadence	about 24 days between releases	about 13 days between releases
Active contributors	1 commit author on the default branch in the last 90 days	3 commit authors on the default branch in the last 90 days
Flags	none	none

How they relate

Both replace hCaptcha. Alternatives to hCaptcha →
Full replacementALTCHAProof-of-work widget verified on your own server, with no cookies or tracking.
Full replacementCapProof-of-work CAPTCHA with a self-hosted server and an invisible mode.
Both replace reCAPTCHA. Alternatives to reCAPTCHA →
Full replacementALTCHAProof-of-work widget verified on your own server, with no cookies or tracking.
Full replacementCapProof-of-work CAPTCHA with a self-hosted server and an invisible mode.

v3.3.02026-10-05This release fixes the widget's proof-of-work code to match the fixed altcha-lib (v2.6.0). It fixes a key-derivation mi…
v3.2.32026-09-20Fix: add rel=noopener attribute to external links [#198]
v3.2.22026-08-19Fix: theme attribute (widget types and HTML attribute)
v3.2.12026-07-12Fix: checkbox focus outline in safari [#194]
v3.2.02026-07-08Fix: i18n load-order [#193]

standalone@3.1.132026-09-23GET /health checks redis and returns 200 or 503. GET /health/live returns 200 while the process runs. neither needs aut…
standalone@3.1.122026-09-23new keys default to hashwx, a gpu-resistant proof of work split into 4 sub-challenges (1,000,000 hashes by default). ex…
standalone@3.1.112026-09-04merges #308 by @taciturnaxolotl
standalone@3.1.82026-07-22better asset server handling
standalone@3.1.72026-07-15fix: merges #281

unsigned The latest release, v3.3.0, carries no signature GitHub could verify.

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✓ signed The latest release, standalone@3.1.13, carries a signature GitHub verified.

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