NetworkSpy is an application-level HTTP/HTTPS debugging tool for capturing and analyzing network traffic. It can intercept HTTPS, inspect request metadata, and compare requests side by side. Users can edit and replay captured requests, set breakpoint rules, and pause or change live traffic. Response mocking, WebSocket inspection with real-time message streaming, and gRPC support with Protobuf decoding are also listed. Its LLM analyzer displays streaming tokens, tracks token usage, and shows latency for each chunk. Custom viewers can visualize proprietary binary formats or other structured data. NetworkSpy runs on Linux, macOS, and Windows, including Apple Silicon support, Debian/Ubuntu packages, and Windows 10/11 support. Physical iOS and Android devices can be configured to use it as a proxy for traffic inspection. The privacy policy says inspected traffic remains on the user's machine and is not collected or monitored. The Free plan costs 0.00 USD per free. Personal costs 18.00 USD per year and limits an individual license to one device; Professional is 29.00 USD per year. Business is 149.00 USD per month and includes priority 24/7 support.
Who it is for
NetworkSpy suits developers who need to inspect, change, replay, or mock application traffic. Its listed protocol support and custom viewers may also suit teams working with streaming AI traffic, WebSockets, gRPC, or proprietary data formats.
What is good
- Supports HTTPS interception and request comparison.
- Can edit and replay traffic with breakpoints.
- Includes WebSocket and gRPC inspection.
- Inspected traffic stays local, according to its privacy policy.
- Available for Linux, macOS, and Windows.
What to know first
- Individual licenses are limited to one device.
- Team licenses are per-seat.
- Free plan has limited LLM token stream analysis.
- Enterprise pricing is custom and not listed.
Verdict
NetworkSpy combines traffic inspection and editing with replay, breakpoints, protocol-specific inspection, and custom viewers. Check the license terms and plan limits, especially the one-device limit for individual licenses.
NetworkSpy plans and pricing
All plansCompared on web debugging proxies
- Free plan
- Yes
- Platforms
- desktop
- Request/response editing
- Yes
- Breakpoint rules
- Yes
- Traffic replay
- Yes
- Response mocking
- Yes
- WebSocket inspection
- Yes
