Captoshi Alternatives

Sites and apps similar to Captoshi include Cap Captcha, which is free and open source. Other options are reCAPTCHA, Private Captcha, ALTCHA and IronWall. You can choose from more than 10 Anti-Spam Tools like Captoshi for self-hosting.

More about Captoshi

Add Alternatives

Captoshi alternatives page was last updated Sep 2, 2026

Cap Captcha
28 likes
Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work and JS instrumentation
Cost / License
Free
Open Source
Application type
Anti-Spam
Origin
Portugal
EU
Platforms
Self-Hosted
Docker
Portugal
EU
Good alternative?Is Cap Captcha a good alternative to Captoshi?
reCAPTCHA
127 likes
reCAPTCHA is a free service that protects your site from spam and abuse, using risk analysis techniques to tell humans and bots apart.
35 reCAPTCHA alternatives
Cost / License
Freemium
Proprietary
Application type
Anti-Spam
Origin
United States
Platforms
Online
United States
Good alternative?Is reCAPTCHA a good alternative to Captoshi?
Private Captcha
17 likes
Private Captcha is an independent, privacy-first, self-hostable Proof-of-Work CAPTCHA service made in EU. Instead of asking users to solve complex puzzles or track their behavior, Private Captcha solves an invisible cryptographic task in the background.
Cost / License
Free Personal
Proprietary
Application type
Anti-Spam
Origin
Estonia
EU
Platforms
Online
Self-Hosted
Docker
Estonia
EU
+1
Good alternative?Is Private Captcha a good alternative to Captoshi?
ALTCHA
11 likes
ALTCHA is a privacy-first solution built to help developers and website owners stop bots, spam, and automated abuse — without making things harder for real users. It replaces traditional CAPTCHA systems with a smarter, quieter approach to verification and threat detection.
26 ALTCHA alternatives
Cost / License
Free
Open Source (MIT)
Application type
Anti-Spam
Origin
Czechia
EU
Platforms
Self-Hosted
Software as a Service (SaaS)
Czechia
EU
Good alternative?Is ALTCHA a good alternative to Captoshi?
IronWall
1 like
IronWall is a Proof-of-Work (PoW) rate-limiting protocol designed to protect high-value API endpoints (AI generation, Auth, SMS triggers) from automated abuse.
Cost / License
Freemium
Open Source (MIT)
Application type
Anti-Spam
Platforms
Online
Software as a Service (SaaS)
+2
Good alternative?Is IronWall a good alternative to Captoshi?
Peak API
Like
Solve CloudFlare Turnstile, WAF challenges, and more in under a second. Built for high-volume applications with flexible pricing.
Cost / License
Paid
Proprietary
Origin
United Kingdom
Platforms
Online
Software as a Service (SaaS)
United Kingdom
Good alternative?Is Peak API a good alternative to Captoshi?
Procaptcha
15 likes
Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy and security. It's a pioneering solution designed to offer an alternative to conventional CAPTCHA systems that often compromise user privacy.
Cost / License
Freemium
Open Source (Apache-2.0)
Application typeApplication types
Anti-Spam
Bot Protection
Origin
United Kingdom
Platforms
Online
Software as a Service (SaaS)
Wordpress
United Kingdom
+3
Good alternative?Is Procaptcha a good alternative to Captoshi?
PrivateStater
1 like
Analytics, Captcha, Feedback widget in one script.
Cost / License
Freemium
Proprietary
Origin
South Korea
Platforms
Online
Software as a Service (SaaS)
South Korea
+4
Good alternative?Is PrivateStater a good alternative to Captoshi?
Cloudflare Turnstile
5 likes
Turnstile is Cloudflare's smart CAPTCHA alternative. It automatically chooses from a rotating suite of non-intrusive browser challenges based on telemetry and client behavior exhibited during a session.
Cost / License
Free
Proprietary
Origin
United States
Platforms
Online
JavaScript
Software as a Service (SaaS)
Good alternative?Is Cloudflare Turnstile a good alternative to Captoshi?
hCaptcha
12 likes
hCaptcha is designed to solve the most labor intensive problem in machine learning: labeling massive amounts of data in a timely, affordable, and reliable way.
Cost / License
Freemium
Proprietary
Application type
Anti-Spam
Origin
United States
Platforms
Online
United States
Good alternative?Is hCaptcha a good alternative to Captoshi?
mosparo
6 likes
mosparo is the modern solution for protecting your online forms from spam. The protection method is quite simple: mosparo blocks spam using rules matching the form’s data. The detection method is comparable to an e-mail spam filter.
Cost / License
Free
Open Source (MIT)
Application type
Anti-Spam
Origin
Switzerland
Platforms
Online
Self-Hosted
Python
JavaScript
Drupal
Django
PHP
Mautic
Wordpress
Switzerland
+9
Good alternative?Is mosparo a good alternative to Captoshi?
mCaptcha
4 likes
A no-nonsense CAPTCHA system with seamless UX | Backend component.
Cost / License
Free
Open Source (AGPL-3.0)
Application type
Anti-Spam
Origin
India
Platforms
Online
Self-Hosted
Software as a Service (SaaS)
India
Good alternative?Is mCaptcha a good alternative to Captoshi?