mitmproxyComparisonTCPUDPDTLSQUICAlternatives
mitmproxy vs InterceptSuite for Raw TCP, UDP, DTLS & QUIC
An honest comparison of mitmproxy and InterceptSuite for non-HTTP traffic: protocol coverage, GUI vs scripts, live editing, Replay, STARTTLS and pricing.
I
InterceptSuite Team
October 6, 2026·6 min read
Short answer: mitmproxy is a free, scriptable proxy that handles raw TCP and UDP as well as HTTP. InterceptSuite is a native desktop GUI built only for non-HTTP traffic, with live hold-and-edit, Replay, STARTTLS auto-upgrade and PCAP export. If you live in a terminal and write Python addons, mitmproxy is hard to beat. If you want to click a packet, edit it in hex and resend it, InterceptSuite is faster to work in.
Last updated 6 October 2026.
Side by side
| mitmproxy | InterceptSuite | |
|---|---|---|
| Licence and price | Free, MIT | Paid, 7-day trial (pricing) |
| Interface | Terminal console, web UI, scripts | Native desktop GUI (Windows, macOS, Linux) |
| Raw TCP and TLS | Yes, reverse and transparent modes | Yes |
| UDP and DTLS | Yes, raw UDP and DTLS modes | Yes: UDP, DTLS 1.0 and 1.2 |
| QUIC / HTTP/3 | Supported in reverse, transparent, WireGuard and local modes; not in regular (HTTP CONNECT) or SOCKS5 mode | QUIC v1 through its normal SOCKS5 proxy; HTTP/3 as raw bytes, decoded and editable with the HTTP/3 extension |
| STARTTLS | Partial | Automatic upgrade detection |
| Live edit | Yes, through console and scripts | Yes, with rules per direction and a hex editor |
| Resend packets | HTTP client replay; raw replay is scripted | Replay for TCP, TLS, UDP, DTLS, QUIC and STARTTLS |
| Extending | Python addons | Python extensions that add decoded tabs |
| PCAP export | Via flow dumps and tooling | Built in |
Where mitmproxy is the better choice
- Price. It is free. If you only need an occasional raw TCP relay, that settles it.
- Automation. Python addons run unattended in CI or a lab.
- HTTP-heavy work. If most of your traffic is HTTP and HTTP/2 with the odd raw socket, one tool covers it.
Where InterceptSuite earns its price
- No scripting to get started. Point the app at the SOCKS5 listener, trust the CA, and traffic appears in Proxy History with host, port, protocol and ALPN. Filter it with expressions like
port == 443 and data contains "token". - Hold only what matters. Interception rules hold packets by host, port, protocol, size or payload, separately for each direction.
- Resend and tweak. Right-click a packet and send it to Replay, edit it in hex, send again, and compare replies in separate tabs.
- STARTTLS and mixed connections. Plaintext-then-TLS protocols such as SMTP, IMAP and PostgreSQL are detected and upgraded without a special mode.
- A team workflow. Projects save history and Replay sessions, and Scope keeps the capture to your targets.
What both tools do not do
Neither decrypts connections that use Encrypted Client Hello (ECH). Neither replaces Burp Suite for web application testing.
Which should you pick?
Use mitmproxy if you want free and scriptable. Use InterceptSuite if you want a GUI for hold, edit and replay across TCP, TLS, DTLS, QUIC, UDP and STARTTLS. Many testers keep both. See the protocol compatibility matrix or the four-way comparison, then try InterceptSuite free for 7 days.