Caido
Caido is a lightweight web security auditing toolkit with an intercepting proxy, replay and automation features.
Legal & ethical use. Use this tool only on systems, networks and data that you own or have explicit written permission to test. Unauthorised access or scanning can break computer-misuse laws (for example Pakistan's Prevention of Electronic Crimes Act, 2016, and equivalents elsewhere). Practise in your own lab or in authorised environments such as CTFs.
What it is used for
- Alternative to Burp for intercepting and replaying requests in a lab
- Learning proxy-based testing with a modern UI
Key features
- Intercepting proxy
- Replay and automation
- Project-based workflow
Installation
Download the desktop app or CLI from caido.io/download (free and paid plans exist).
Beginner usage guide
Create a project, configure your browser to use the proxy, browse your practice site and send requests to Replay for modification.
Example commands
Run these only against your own lab or authorised targets. Placeholder addresses such as 192.0.2.x are documentation ranges.
Default proxy address
127.0.0.1:8080Configure your test browser to use this listener (check the app for the active port).
References
Source verification
Last reviewed: 2026-10-27
Links checked over HTTP: 2026-10-27 07:51 UTC — official: 200, docs: 200, repo: 200
Commands were written from the official documentation and have not been executed on this site; test them in your lab.