InputGuard Alternatives

Apps similar to InputGuard include Cap Captcha, which is free and open source. Other options are Anubis, reCAPTCHA, PrivateStater and Procaptcha. You can choose from more than 10 Anti-Spam Tools like InputGuard for the web and self-hosting.

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InputGuard alternatives page was last updated Sep 9, 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 InputGuard?
Anubis
19 likes
Applies sha256 proof-of-work challenges to incoming HTTP requests, targeting AI crawlers, bots that ignore robots.txt, and automated scrapers, protecting server resources and preventing unwanted search engine indexing for privacy-focused sites.
58 Anubis alternatives
Cost / License
Free Personal
Open Source (MIT)
Application typeApplication types
Bot Protection
DDoS Protection
Origin
Canada
Platforms
Self-Hosted
Go (Programming Language)
Docker
Canada
Good alternative?Is Anubis a good alternative to InputGuard?
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 InputGuard?
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 InputGuard?
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 InputGuard?
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 InputGuard?
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 InputGuard?
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 InputGuard?
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 InputGuard?
Friendly Captcha
11 likes
Friendly Captcha is a leading cybersecurity company with a clear mission: to reliably defend against modern bot attacks and spam while complying with the GDPR and other privacy regulations. As Germany's largest CAPTCHA provider, Friendly Captcha uses innovative technology to...
Cost / License
Freemium
Proprietary
Application type
Anti-Spam
Origin
Germany
EU
Platforms
Online
Software as a Service (SaaS)
Germany
EU
Good alternative?Is Friendly Captcha a good alternative to InputGuard?
5arz
1 like
Prove a real, unique human performed an action; mint a signed, verifiable Proof-of-Human credential. MCP server for agents.
Cost / License
Freemium
Proprietary
Application type
Anti-Spam
Origin
United States
Platforms
Software as a Service (SaaS)
Good alternative?Is 5arz a good alternative to InputGuard?
MTcaptcha
3 likes
MTCaptcha is a smart captcha service that prioritizes privacy and accessibility. It offers an adaptive invisible noCaptcha that is easy for humans but hard for bots, making verification frictionless. MTCaptcha is GDPR and WCAG compliant, ensuring that your data is never sold or...
Cost / License
Freemium
Proprietary
Origin
Canada
Platforms
Software as a Service (SaaS)
Canada
+2
Good alternative?Is MTcaptcha a good alternative to InputGuard?