Cloudflare Turnstile costs $15/mo.
These cost $0.
6 free alternatives to Cloudflare Turnstile, checked for license, recent activity and real adoption. Each one tells you the catch, so you can switch with your eyes open.
The top-rated free, open-source replacement for Cloudflare Turnstile is Cap (Open Source Open Source). Across this category, 4 self-hostable tools are available (including Cap and ALTCHA). Switching a 5-person team saves up to $900/year compared to Cloudflare Turnstile's $15/mo subscription.
The catch: Requires self-hosting setup, updates, and server maintenance compared to managed Cloudflare Turnstile.
Cloudflare Turnstile vs Free Alternatives
Quick side-by-side comparison · $0/mo vs $15/mo
| Alternative | Type | License | Where It Runs | Stars | Head-to-Head |
|---|---|---|---|---|---|
| Cap | open source | Open Source | Self-host | ★ 8.3k | Cloudflare Turnstile vs Cap → |
| ALTCHA | open source | Open Source | Self-host | ★ 2.9k | Cloudflare Turnstile vs ALTCHA → |
| mCaptcha | open source | Open Source | Self-host | ★ 2.5k | Cloudflare Turnstile vs mCaptcha → |
| Procaptcha | open source | Open Source | Local | ★ 303 | Cloudflare Turnstile vs Procaptcha → |
| Private Captcha | open source | Open Source | Self-host | ★ 199 | Cloudflare Turnstile vs Private Captcha → |
| Friendly Captcha | open source | Open Source | Local | ★ 37 | Cloudflare Turnstile vs Friendly Captcha → |
The picks
6 open source · ranked by fit
- 01
Cap
open sourceOpen SourceSelf-host8.3knov 2026Lightweight open-source CAPTCHA solution using SHA-256 proof-of-work. 250x smaller than hCaptcha, fully customizable, and privacy-focused with zero telemetry.
The catch vs Cloudflare TurnstileRequires self-hosting setup, updates, and server maintenance compared to managed Cloudflare Turnstile.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/tiagozip/cap or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 02
ALTCHA
open sourceOpen SourceSelf-host2.9knov 2026ALTCHA offers cutting-edge spam and abuse protection for websites and apps, with privacy-friendly CAPTCHA alternatives designed for GDPR compliance.
The catch vs Cloudflare TurnstileRequires self-hosting setup, updates, and server maintenance compared to managed Cloudflare Turnstile.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/altcha-org/altcha or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 03
mCaptcha
open sourceOpen SourceSelf-host2.5knov 2026Privacy-focused proof-of-work CAPTCHA system that silently protects websites without tracking users or requiring image solving. Drop-in replacement for reCAPTCHA.
The catch vs Cloudflare TurnstileRequires self-hosting setup, updates, and server maintenance compared to managed Cloudflare Turnstile.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/mcaptcha/mcaptcha or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 04
Procaptcha
open sourceOpen SourceLocal303nov 2026A blockchain-based CAPTCHA solution offering improved security, user experience, and resistance to bot attacks for web applications.
The catch vs Cloudflare TurnstileCommunity-driven open source project without dedicated enterprise SLAs.
Install, platforms & data +
- platforms
- desktopcross-platformone-click install
- install
- Clone https://github.com/prosopo/captcha or deploy with Docker Compose
- setup
- Download the native package or installer for your operating system.
- your data
- All application data lives locally on your own machine.
- checked
- 2026-11-07
- 05
Private Captcha
open sourceOpen SourceSelf-host199nov 2026Privacy-first CAPTCHA service that blocks bots while keeping forms accessible. No puzzles, no tracking, no cookies - just invisible cryptographic protection.
The catch vs Cloudflare TurnstileRequires self-hosting setup, updates, and server maintenance compared to managed Cloudflare Turnstile.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/privatecaptcha/privatecaptcha or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 06
Friendly Captcha
open sourceOpen SourceLocal37nov 2026Privacy-compliant CAPTCHA alternative using proof-of-work technology. Protects websites from bots and spam without user interaction or data tracking.
The catch vs Cloudflare TurnstileCommunity-driven open source project without dedicated enterprise SLAs.
Install, platforms & data +
- platforms
- desktopcross-platformone-click install
- install
- Clone https://github.com/FriendlyCaptcha/friendly-captcha-sdk or deploy with Docker Compose
- setup
- Download the native package or installer for your operating system.
- your data
- All application data lives locally on your own machine.
- checked
- 2026-11-07
Cloudflare Turnstile Head-to-Head Comparisons (2027)
Side-by-side trade-off breakdowns · 6 free alternatives
Frequently Asked Questions
Direct answers · Cloudflare Turnstile open-source replacements
What is the best free alternative to Cloudflare Turnstile?+
The top free alternative to Cloudflare Turnstile is Cap (open source, Open Source). Lightweight open-source CAPTCHA solution using SHA-256 proof-of-work. 250x smaller than hCaptcha, fully customizable, and privacy-focused with zero telemetry. Other popular Cloudflare Turnstile replacements include ALTCHA, mCaptcha, Procaptcha.
Can I self-host a free replacement for Cloudflare Turnstile?+
Yes. Of the 6 free alternatives to Cloudflare Turnstile, 4 can be self-hosted on your own server or local machine: Cap (Open Source), ALTCHA (Open Source), mCaptcha (Open Source), Private Captcha (Open Source).
How much does switching from Cloudflare Turnstile to a free alternative save?+
Cloudflare Turnstile starts at $15/month per seat ($180/year). Switching a 5-person team to a free alternative like Cap saves $900 per year in software subscription fees.
Should I vibe-code or build my own Cloudflare Turnstile clone from scratch?+
Our build verdict for Cloudflare Turnstile is NO (use a free alternative, save the tokens). Instead of paying recurring SaaS fees for Cloudflare Turnstile or rebuilding it from scratch, deploy one of the 6 battle-tested open-source alternatives like Cap.
What is the catch when switching from Cloudflare Turnstile to Cap?+
Requires self-hosting setup, updates, and server maintenance compared to managed Cloudflare Turnstile.
