Cap Standalone (open-source CAPTCHA)

Cap is an open-source, self-hosted CAPTCHA alternative to reCAPTCHA that uses proof-of-work instead of visual puzzles. It is free under Apache 2.0.

Cap CAPTCHAUpdated monthly · checked 25 h ago

Cap Standalone (open-source CAPTCHA) is a security, legal and HR perk from Cap CAPTCHA, offering a free plan (open source, self-hosted), with no funding required.

Value: Free plan
Who qualifies: No funding needed
Benefit type: Free plan
Terms: Verified

Apply at Cap CAPTCHA

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What you get

Inside Cap Standalone (open-source CAPTCHA)

Cap is licensed under Apache 2.0 and runs entirely on your own infrastructure, so visitor data does not go to a vendor. It has no quotas and no per-request fees. Cap Standalone fits on a $5 VPS for most sites. Its siteverify API is compatible with reCAPTCHA and hCaptcha.

Source: The provider's official program page

Eligibility

Who it's for

Free plan Any startup

Funding / backing: No funding needed
Geography: Global
Recurring / expiry: Free and open source, with no time limit.
Other requirements: You host and run the Cap server yourself.

How to claim

How to apply for Cap Standalone (open-source CAPTCHA)

Steps to apply

1Self-host Cap from capjs.js.org.

Good to know: Plans read on capjs.js.org on October 28, 2026.

Apply at Cap CAPTCHA

Source: The provider's official program page

Value is the headline maximum Cap CAPTCHA advertises. What your company actually receives depends on your eligibility and how you use the program, and terms can change. A comparison, not endorsed by the programs listed. A link labeled as a referral link may earn us a commission, and a program labeled Same owner comes from the company that runs StartupPerks. Confirm current terms on the provider's page.

Questions

Cap Standalone (open-source CAPTCHA): common questions

Is Cap CAPTCHA free?

Yes, Cap CAPTCHA can be used for free. Free plan (open source, self-hosted). As stated on Cap CAPTCHA's own page, linked on this page.

Who qualifies for Cap Standalone (open-source CAPTCHA)?

Cap Standalone (open-source CAPTCHA) is open to any startup, with no funding required. You host and run the Cap server yourself.

Do I need to be VC-backed or in an accelerator to get Cap Standalone (open-source CAPTCHA)?

No. Cap Standalone (open-source CAPTCHA) is open to any startup that meets the stated criteria, no investor or accelerator backing required.

How do I apply for Cap Standalone (open-source CAPTCHA)?

Self-host Cap from capjs.js.org.

How long do I have to use Cap Standalone (open-source CAPTCHA), and does it expire?

Free and open source, with no time limit.

Is Cap Standalone (open-source CAPTCHA) available outside the US?

Cap Standalone (open-source CAPTCHA) is available globally, subject to the provider's terms.

Free CAPTCHA services, comparedCap (open-source CAPTCHA)'s free plan next to every other free CAPTCHA serviceWhat each CAPTCHA service gives you free today, its main limit and what the first paid plan costs, read from each provider's own page.

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