ALTCHA Open-Source

ALTCHA is a privacy-first CAPTCHA that uses a silent proof-of-work challenge instead of puzzles. Its open-source widget is free forever.

ALTCHAUpdated monthly · checked 25 h ago

ALTCHA Open-Source is a security, legal and HR perk from ALTCHA, offering a free plan (open source, no limits), with no funding required.

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

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What you get

Inside ALTCHA Open-Source

The ALTCHA Open-Source widget is a free, MIT-licensed CAPTCHA with proof-of-work challenges and no cookies, with no sign-up, API keys or usage limits, and it can be self-hosted. It supports 50+ languages and WCAG 2.2 AA accessibility. Paid ALTCHA Cloud and Sentinel plans add hosted analytics and adaptive threat protection.

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 forever.
Other requirements: The paid Cloud and Sentinel plans are separate from the free open-source widget.

How to claim

How to apply for ALTCHA Open-Source

Steps to apply

1Download the open-source widget from altcha.org.
2No sign-up is needed.

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

Apply at ALTCHA

Source: The provider's official program page

Value is the headline maximum ALTCHA 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