Comparison

Burp Suite alternative for thick-client traffic.

Burp Suite remains excellent for HTTP/HTTPS testing. InterceptSuite is built for the traffic Burp is not designed to inspect: raw TCP, TLS, DTLS, QUIC v1, UDP, and STARTTLS-style upgrades.

TCPTLSDTLSQUIC v1UDPSTARTTLS
Use caseBurp SuiteInterceptSuite
Web apps and REST APIsBest fitLimited
Thick clients with custom protocolsNoYes
TCP/TLS interception outside HTTPNoYes
DTLS / raw UDP / QUIC v1NoYes
Routing proxy-unaware desktop appsRequires external toolingYes (with ProxyBridge)

Burp for web. InterceptSuite for non-HTTP.

Keep your existing Burp workflow for browser traffic. Add InterceptSuite when assessments include desktop apps, IoT protocols, binary wire formats, or encrypted non-HTTP channels. If the target app has no proxy settings, route it through open-source ProxyBridge.