Top 12 Open-Source Alternatives to GeeTest CAPTCHA

GeeTest CAPTCHA

GeeTest protects your websites, mobile Apps and APIs from bot threats.

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Alternatives Status Page

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Product categories

API Tools Anti-Spam Captcha Cloud VPN Monitoring Tools Privacy SPAM Protection Security Security & Privacy Security Monitoring VPN Web Application Security

Summary

The top open-source alternatives to GeeTest CAPTCHA are mosparo, Yuzu, and ALTCHA. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

mosparo Landing Page
1

mosparo

the modern spam protection
Pricing:
- Open Source
#Security #SPAM Protection #Security & Privacy
Yuzu Landing Page
2

Yuzu

An experimental open-source emulator for the Nintendo Switch
Pricing:
- Open Source
#API Tools #Monitoring Tools #Security & Privacy 73 social mentions
ALTCHA Landing Page
3

ALTCHA

ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam.
Pricing:
- Open Source
- Free
#Anti-Spam #SPAM API #SPAM Protection
DOOM Captcha Landing Page
4

DOOM Captcha

Captchas don't have to be boring
Pricing:
- Open Source
#Security #User Experience #Tech 4 social mentions
OpenVPN Landing Page
5

OpenVPN

OpenVPN - The Open Source VPN
Pricing:
- Open Source
#VPN #Security & Privacy #Privacy 40 social mentions
ModSecurity Landing Page
6

ModSecurity

ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
Pricing:
- Open Source
#CDN #Web Application Security #Security Monitoring
WireGuard Landing Page
7

WireGuard

Fast, Modern, Secure VPN Tunnel
Pricing:
- Open Source
#VPN #Security & Privacy #Privacy 9 social mentions
CyberSiara Landing Page
8

CyberSiara

Leverage the complexity of the human eye to beat bots in a way no other CAPTCHA can. Keep your privacy. Secure your Site. Enhance your User Experience.
Pricing:
- Open Source
- Freemium
- Free Trial
- £15.0 / Monthly (Tier 1, up to 1,000 queries)
#Cyber Security #SPAM Protection #Bots 1 user reviews
2captcha Landing Page
9

2captcha

2captcha is captcha bypassing software which offers various exciting tools and simple module that gives the fundamental outlook of the captcha.
Pricing:
- Open Source
- Paid
- $0.5 (per 1000 CAPTCHAs)
#Web Application Security #Anticaptcha #Online Services 43 social mentions
Let's Encrypt Landing Page
10

Let's Encrypt

Let’s Encrypt is a free, automated, and open certificate authority brought to you by the Internet Security Research Group (ISRG).
Pricing:
- Open Source
#Two Factor Authentication #Identity And Access Management #Security & Privacy 338 social mentions
ZeroTier Landing Page
11

ZeroTier

Extremely simple P2P Encrypted VPN
Pricing:
- Open Source
#VPN #Security & Privacy #Privacy 35 social mentions
ZMap Landing Page
12

ZMap

ZMap is a fast single packet network scanner designed for Internet-wide network surveys.
Pricing:
- Open Source
#Security Monitoring #Security #Monitoring Tools 7 social mentions