FiddlerCore vs NetworkSpy
FiddlerCore
telerik.com
NetworkSpy
networkspy.appSide by side
| Figure | FiddlerCore | NetworkSpy |
|---|---|---|
| Price from | $249.92/mo | $1.50/mo |
| Free plan | — | Yes |
| Free trial | Yes | Yes |
| Open source | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 2 | 7 |
| Spec score · Web Debugging Proxies | 8.4 (#10) | 9.1 (#3) |
| Integrations | The product page lists integration with Telerik Fiddler and Telerik TestStudio. | The site lists a native Model Context Protocol bridge for connecting traffic to AI agents and SSO/SAML integration on the Business plan. |
Plans
FiddlerCore
- Internal Applications Use$2,999 a year
- Commercial Applications UsePriced on request
NetworkSpy
- FreeFree
- Personal$18 a year
- Professional$29 a year
- Team Starter$49 a month
- Lifetime$99, paid once
- Business$149 a month
- EnterprisePriced on request
In their own words
FiddlerCore
FiddlerCore has no write-up on Specifiction yet; its figures are above.
NetworkSpy
NetworkSpy is an application-level HTTP/HTTPS debugging tool for capturing and analyzing network traffic. It can intercept HTTPS, inspect request metadata, compare requests side by side, and let users edit and replay captured traffic. Breakpoints can pause or change live requests, and response mocking is supported. It also handles WebSocket message streaming and gRPC with Protobuf decoding. Its LLM analyzer visualizes streaming tokens, tracks token usage, and reports latency for each chunk; custom viewers can display proprietary binary formats or other structured data. NetworkSpy runs on macOS, Linux, and Windows, and physical iOS and Android devices can be configured to route traffic through it for inspection. The privacy policy says inspected traffic stays on the user's machine and is not collected or monitored. The free plan has limits on LLM token analysis and other features. Personal costs $18 a year, Professional $29 a year, Team Starter $49 a month, and Business $149 a month. An individual license is limited to one device.