Skip to content

Home AI tools NEW Alternatives Deals Guides

Top 100 AI GitHub activity AI categories AI Compare Saved AI tools Learn about AI Categories Collections Newly added Underrated this week Technology stacks Tags Licenses Compare tools About AltStack Advertise

.nav-explore{display:none}

Explore

Top 100 AI GitHub activity AI categories AI Compare Saved AI tools Learn about AI Categories Collections Newly added Underrated this week Technology stacks Tags Licenses Compare tools About AltStack Advertise

Loading this page…

Find free alternatives to paid software.
Created by Sushil Kumar Sah.

Browse

Tools AI tools Alternatives Top 100 AI GitHub activity AI categories Learn about AI Categories Tech stacks Tags Licenses Deals & trials

Collections

Newly added Underrated this week Trending Self-hosted AI tools Coming soon

Resources

Blog & guides AI resources About AltStack Submit a tool Advertise Become a sponsor

Your toolkit

Saved open software Saved AI tools Compare open software Compare AI tools Download catalog Contact Privacy

© 2026 Sushil Kumar Sah. All rights reserved.Compare free and paid software.

Popular alternativesChatGPT Claude Claude Code Cursor GitHub Copilot Notion Figma Canva Photoshop Slack Airtable Zapier Google Analytics Vercel Firebase Dropbox

DirectoryProcaptcha

CAPTCHA & Bot Protection Tools

Procaptcha

Decentralized CAPTCHA for enhanced web security.

Pricing not verified

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

Visit website Source repository

302Repository stars

10Forks

Apache-2.0License

4d agoLast commit

Procaptcha product interface — Procaptcha · official product interface

About Procaptcha

Decentralized CAPTCHA for enhanced web security. Visit the project website to check the currently available deployment options.

Explore the project

CAPTCHA & Bot Protection Tools

Technology stack

Technologies recorded in the catalog snapshot.

Github Actions JavaScript NodeJS CSS Bash Docker Typescript JSX React npm Vite Zod Vitest Redis Express Babel Esbuild Webpack Vue Biome JS Vue.js Swift MongoDB Kotlin SWC CypressCI Svelte Angular Caddy NX

Tags

privacy security captcha proof-of-work spam-protection antispam ddos-protection captcha-alternative ddos-mitigation spam-detection bot-detection hcaptcha invisible-captcha recaptcha self-host bot-defense frictionless-captcha human-verification polkadot procaptcha spam

Alternative to

Cloudflare Turnstile

Project details

License Apache-2.0

Hosting Check project website

Status Listed

Data checked 11 Oct 2026

Know a better alternative?

Help Sushil make the directory more useful.

Submit a project Report a correction

Related projects

Cap product interface

Cap

CAPTCHA & Bot Protection Tools

Pricing not verified

Privacy-first CAPTCHA alternative with proof-of-work.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

8.0kstars+ 24030 daysApache-2.0

USE INSTEAD OF

Cloudflare Turnstile

ALTCHA product interface

ALTCHA

CAPTCHA & Bot Protection Tools

Pricing not verified

Next-Gen CAPTCHA and Spam Protection, GDPR compliant.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

2.8kstars+ 6330 daysMIT

USE INSTEAD OF

Cloudflare Turnstile

mCaptchaProduct logo · See the interface on the official website

mCaptcha

CAPTCHA & Bot Protection Tools

Pricing not verified

Privacy-first proof-of-work CAPTCHA without user friction.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

2.5kstars+ 430 daysAGPL-3.0

USE INSTEAD OF

Cloudflare Turnstile

Private Captcha product interface

Private Captcha

CAPTCHA & Bot Protection Tools

Pricing not verified

GDPR-compliant bot protection without user friction.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

197stars+ 430 daysUnknown

USE INSTEAD OF

Cloudflare Turnstile

Friendly CaptchaProduct logo · See the interface on the official website

Friendly Captcha

CAPTCHA & Bot Protection Tools

Pricing not verified

Invisible bot protection that respects user privacy.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

37stars+ 430 daysMPL-2.0

USE INSTEAD OF

Cloudflare Turnstile

OneHuman product interface

OneHuman

CAPTCHA & Bot Protection Tools

Pricing not verified

Access control for AI agents your customers log in with.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

19stars+ 830 daysBUSL-1.1

USE INSTEAD OF