1
Cap
trycap.devAlso covers captcha, security tools, and self hosted
Cap provides a self-hosted, open source alternative to CAPTCHA challenges for websites.
Alternatives
The Best Cap Alternatives in 2026
24 alternatives1 free · 13 open source
Looking for something like Cap? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 1 are free or have a free plan and 13 are open source.
Cap offers an open-source, self-hosted CAPTCHA alternative using proof-of-work and instrumentation challenges.
Top picks at a glance
First suggestionCapCap provides a self-hosted, open source alternative to…Free or freemium optionM CaptchaAdd a proof-of-work CAPTCHA system to an application using…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Cap | — | Not stated | Web |
| 2 | M Captcha | Free | Yes | — |
| 3 | mCaptcha | — | Not stated | Web |
| 4 | LibreCaptcha | — | Yes | — |
| 5 | Smart Sec Cam | — | Yes | — |
| 6 | BlackVault | — | Yes | — |
| 7 | OpenAPI Converter | — | Not stated | — |
| 8 | Dockle | — | Yes | — |
| 9 | OpenSCA-CLI | — | Yes | — |
| 10 | Web Check | — | Yes | — |
All Cap alternatives
2
Also covers docker, security tools, and self hosted · same kind of open-source project · free
Add a proof-of-work CAPTCHA system to an application using the mCaptcha backend component.
3
mCaptcha
mcaptcha.orgAlso covers captcha and security tools
Add proof-of-work verification to websites with mCaptcha, a privacy-focused automated CAPTCHA system.
4
Also covers security tools and self hosted · same kind of open-source project
Build self-hosted, privacy-respecting CAPTCHA flows with the LibreCaptcha framework.
5
Also covers docker, security tools, and self hosted · same kind of open-source project
Run a privacy-focused home security camera system with support for multiple USB or Raspberry Pi cameras.
6
Also covers security tools and self hosted · same kind of open-source project
BlackVault protects AI API credentials with rate limits, budget caps, model restrictions, and an emergency kill switch.
7
OpenAPI Converter
github.com/alufers/mitmproxy2swaggerAlso covers docker and security tools · same kind of open-source project
Convert captured proxy traffic into an OpenAPI description by reverse engineering REST APIs.
8
Also covers docker and security tools · same kind of open-source project
Security and best-practice issues in container images can be checked with Dockle.
9
Also covers docker and security tools · same kind of open-source project
Check open-source dependencies for vulnerabilities and license compliance with OpenSCA-CLI.
10
Also covers docker and security tools · same kind of open-source project
Analyze a website with Web Check, an all-in-one tool described as an OSINT utility.
11
Cli
github.com/snyk/cliAlso covers docker and security tools · same kind of open-source project
Snyk CLI scans and monitors software projects for security vulnerabilities.
12
Also covers docker and security tools · same kind of open-source project
Analyze software with Ghidra, a framework for reverse engineering compiled programs.
13
Also covers docker and security tools · same kind of open-source project
Add OpenID Connect and OAuth 2.1 identity-provider capabilities through Ory Hydra’s headless APIs.
14
Also covers docker and security tools · same kind of open-source project
CrowdSec provides open-source intrusion prevention, web application firewall, and bot detection tools.
15
REMnux
remnux.orgAlso covers docker and security tools
Malware investigation and reverse engineering are the focus of REMnux, a Linux toolkit that bundles analysis tools.
16
Also covers docker and security tools
Inspect HTTPS traffic interactively with mitmproxy, an open-source proxy tool.
17
HTTPToolkit
httptoolkit.comAlso covers docker and security tools
Intercept, inspect, and edit HTTP(S) traffic with HTTP Toolkit for debugging and testing.
18
Ai Cybersecurity Agent
huggingface.co/spaces/Agents-MCP-Hackathon/DSA…Also covers docker and security tools
This cybersecurity agent scans security logs and files for threats and recommends mitigations.
19
2FAuth
docs.2fauth.appAlso covers security tools
Store, generate, and organize one-time password codes with 2FAuth, a self-hosted manager for individuals and teams.
20
Also covers security tools · same kind of open-source project
Inspect iOS and macOS applications with Malimite, a decompiler project hosted on GitHub.
21
Also covers security tools · same kind of open-source project
This GitHub list curates GPT agents designed for cybersecurity work and related security tasks.
22
Frida
frida.reAlso covers security tools
Observe and reprogram running programs with Frida’s dynamic instrumentation toolkit.
23
challenges.re
challenges.reAlso covers security tools
Solve reverse engineering challenges published on challenges.re, a challenge-focused site.
24
Cheatsheet
comparitech.com/net-admin/metasploit-cheat-sheetAlso covers security tools
The Metasploit cheat sheet collects command references for working with the framework.
No alternatives match this filter.
Alternatives to similar tools
challenges.re24 alternativesOpenAPI Converter24 alternativesmCaptcha24 alternativesSmart Sec Cam24 alternativesOpenSCA-CLI24 alternativesAwesome GPT Agents24 alternatives
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What is the best alternative to Cap?
Based on features, tags and platforms, the closest alternatives to Cap are Cap, M Captcha, and mCaptcha.
Is there a free alternative to Cap?
Yes. M Captcha is free or offer a free plan.
Are there open-source alternatives to Cap?
Yes: M Captcha, LibreCaptcha, Smart Sec Cam, and BlackVault.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative