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NetworkSpy
networkspy.app
What it is
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.
Spec sheet
- What it does
- NetworkSpy is a desktop HTTP/HTTPS proxy debugger that captures, decrypts, analyzes, compares, edits and replays application traffic.Read 15 Oct 2026 · networkspy.app
- Purpose
- NetworkSpy is an application-level HTTP/HTTPS debugging tool for capturing and analyzing network traffic.Read 4 Oct 2026 · networkspy.app
- Integrations
- The site lists a native Model Context Protocol bridge for connecting traffic to AI agents and SSO/SAML integration on the Business plan.Read 4 Oct 2026 · networkspy.app
- Support
- The Professional plan includes priority email support, while Business includes priority 24/7 support.Read 4 Oct 2026 · networkspy.app
- Account data
- The privacy policy says NetworkSpy collects email addresses, license keys, and anonymous device identifiers for licensing and account purposes.Read 4 Oct 2026 · networkspy.app
- AI analysis
- LLM-powered analysis explains payload behavior and flags possible logic errors.Read 15 Oct 2026 · networkspy.app
- AI traffic analysis
- Its LLM analyzer visualizes streaming tokens, tracks token usage, and shows latency for each chunk.Read 4 Oct 2026 · networkspy.app
- AI viewer limit
- The maker states that built-in LLM viewers target OpenAI-compatible completions endpoints and are not intended to provide full backend observability for complete agent-loop timelines.Read 15 Oct 2026 · producthunt.com
- Architecture
- The GitHub repository describes a cross-platform Tauri application built with Rust and React, storing analyzed traffic in a local SQLite database.Read 15 Oct 2026 · github.com
- Changelog update
- Version 1.2.0, dated May 1, 2026, added Protobuf, gRPC and custom binary inspection, regex global search, a 40% lower memory footprint, accessibility refinements and faster Windows/Linux startup.Read 15 Oct 2026 · networkspy.app
- Comparison engine
- A side-by-side comparison engine diffs request headers, bodies and response states to reveal regressions.Read 15 Oct 2026 · networkspy.app
- Custom viewers
- Users can build and plug in custom visualizers for proprietary binary or structured payload formats.Read 15 Oct 2026 · networkspy.app
- Developer setup
- The repository documents cloning the project, running bun install, launching with bun run tauri dev and building with bun run tauri build.Read 15 Oct 2026 · github.com
- Documentation depth
- The repository includes separate files for custom viewers, features, MCP, security, contributing and installation, indicating implementation-level documentation and extension guidance.Read 15 Oct 2026 · github.com
- Extensibility
- The product supports custom viewers for visualizing proprietary binary formats or other structured data.Read 4 Oct 2026 · networkspy.app
- Extensibility praise
- Product Hunt’s maker response says custom viewers can aggregate multiple traffic inspections and be versioned in GitHub for team sharing.Read 15 Oct 2026 · producthunt.com
- GraphQL support
- GraphQL inspection parses nested queries, mutations and fragments with schema-aware views.Read 15 Oct 2026 · networkspy.app
- HTTPS interception
- The product provides full HTTPS interception with automatic certificate management and one-click trust setup.Read 15 Oct 2026 · networkspy.app
- Licence
- The public repository is marked Apache-2.0 licensed, while the product website footer states that the web application is released under MIT License.Read 15 Oct 2026 · github.com
- License limit
- The pricing FAQ says an individual license is limited to one device and team licenses are per-seat.Read 4 Oct 2026 · networkspy.app
- Linux limitation
- Official Linux releases provide .deb packages only; RPM or AppImage builds require cloning the repository and running the release workflow manually.Read 15 Oct 2026 · github.com
- Live breakpoints
- Breakpoints can pause live traffic and change payloads or status codes before delivery.Read 15 Oct 2026 · networkspy.app
- LLM streaming
- The LLM analyzer visualizes streaming tokens, token usage and latency for each response chunk.Read 15 Oct 2026 · networkspy.app
- Maker origin
- The maker said NetworkSpy grew from personal experience using network inspection to understand API data flows and project behavior.Read 15 Oct 2026 · reddit.com
- Maker positioning
- The maker described the product as focused on understanding and exploring traffic with custom payload viewers rather than only capturing requests.Read 15 Oct 2026 · reddit.com
- MCP integration
- A native Model Context Protocol bridge lets AI agents query local NetworkSpy traffic logs.Read 15 Oct 2026 · networkspy.app
- Mobile device inspection
- The pricing FAQ says physical iOS and Android devices can be configured to use NetworkSpy as a proxy for traffic inspection.Read 4 Oct 2026 · networkspy.app
- Mobile proxying
- Physical iOS and Android devices can be configured to use NetworkSpy as a traffic proxy.Read 15 Oct 2026 · networkspy.app
- Product Hunt listing
- Product Hunt lists NetworkSpy as a free testing and QA product tagged API, open source and developer tools, with 97 followers when opened.Read 15 Oct 2026 · producthunt.com
- Protocols
- The pricing FAQ says NetworkSpy supports gRPC, including Protobuf decoding, and WebSockets with real-time message streaming.Read 4 Oct 2026 · networkspy.app
- Rating on Product Hunt
- No rating is shown; the listing states that NetworkSpy has no reviews yet.Read 15 Oct 2026 · producthunt.com
- Refund policy
- The pricing page states that NetworkSpy offers a 30-day money-back guarantee.Read 15 Oct 2026 · networkspy.app
- Refund terms
- The pricing page offers a 30-day money-back guarantee, while the Terms of Service say refunds are generally not provided except as required by law or specified in the refund policy.Read 4 Oct 2026 · networkspy.app
- Release timing
- Product Hunt records NetworkSpy as launched in 2026 and displayed it as launched four months before the page was opened.Read 15 Oct 2026 · producthunt.com
- Replay and breakpoints
- Users can modify and replay captured requests and pause or change live traffic with breakpoints.Read 4 Oct 2026 · networkspy.app
- Repository activity
- The GitHub page showed 42 stars, one watcher and zero forks when opened.Read 15 Oct 2026 · github.com
- Request inspection
- Each captured request can expose headers, raw bodies, timing information and payload validation details.Read 15 Oct 2026 · networkspy.app
- Request replay
- Captured traffic can be modified and re-emitted for testing edge cases and API behavior.Read 15 Oct 2026 · networkspy.app
- Resource mapping
- Remote resources can be replaced with local files to test frontend changes without backend updates.Read 15 Oct 2026 · networkspy.app
- Scripting
- Programmable workflow rules automate traffic modifications as requests pass through the proxy.Read 15 Oct 2026 · networkspy.app
- Security auditing
- The application advertises real-time checks for API risks including IDOR, mass assignment and sensitive-data exposure.Read 15 Oct 2026 · networkspy.app
- Security posture
- The project says decryption and traffic analysis remain local and that captured traffic does not leave the device.Read 15 Oct 2026 · github.com
- Session statistics
- Session summaries show bandwidth totals, error rates, top domains and protocol distribution.Read 15 Oct 2026 · networkspy.app
- Subscription consequence
- The pricing FAQ says cancelling a subscription ends app access at the end of the billing period unless a Lifetime licence is purchased.Read 15 Oct 2026 · networkspy.app
- Supported desktop systems
- The download page lists macOS, Linux, and Windows, including Apple Silicon support, Debian/Ubuntu packages, and Windows 10/11 support.Read 4 Oct 2026 · networkspy.app
- Supported downloads
- macOS supports Apple Silicon M1/M2/M3, Linux has native Debian/Ubuntu .deb packages, and Windows supports versions 10 and 11 with installer and portable builds.Read 15 Oct 2026 · networkspy.app
- Traffic inspection
- It supports HTTPS interception, request metadata inspection, and side-by-side comparison of requests.Read 4 Oct 2026 · networkspy.app
- Traffic privacy
- The privacy policy says inspected network traffic is not collected or monitored and remains local to the user's machine.Read 4 Oct 2026 · networkspy.app
- Traffic search
- A query builder filters large log sets by host, method, status code and path patterns.Read 15 Oct 2026 · networkspy.app
Plans and prices
Free Free Core features · limited LLM token analysis · limited breakpoints · limited resource mapping · limited custom viewer builder · limited scripting Read 15 Oct 2026 · networkspy.app
Personal $18 a year $18/year Full HTTP Debug Proxy Kit · GraphQL and JSON inspectors · LLM Token Analyzer · Custom Viewer Builder + AI · 1 device · Direct Discord access Read 15 Oct 2026 · networkspy.app
Professional $29 a year $29/year Everything in Personal · AI Viewer with custom providers · MCP · priority email support Read 15 Oct 2026 · networkspy.app
Team Starter $49 a month $49/mo Up to 5 users · centralized team billing · shared plugin presets · standard team dashboard Read 15 Oct 2026 · networkspy.app
Lifetime $99, paid once $99 one-time Everything in Pro · beta features · lifetime updates Read 15 Oct 2026 · networkspy.app
Business $149 a month $149/mo Up to 20 users · audit logs and activity · SSO and SAML integration · priority 24/7 support Read 15 Oct 2026 · networkspy.app
Enterprise Priced on request Custom Unlimited user seats · custom security reviews · on-premise deployment · dedicated account manager Read 15 Oct 2026 · networkspy.app
Strong points and limits
Strong points
- HTTPS interception and request comparison
- Breakpoints can pause or change live traffic
- Supports WebSockets and gRPC with Protobuf decoding
- Inspected traffic remains local, according to its policy
- Desktop downloads for Linux, macOS, and Windows
Limits
- Free plan limits several features
- Individual license is limited to one device
- Team Starter costs $49 a month
- Business costs $149 a month
Who it suits
NetworkSpy suits developers who need to inspect, edit, replay, or compare application traffic across desktop systems. Its protocol support and mobile proxy setup may be useful for teams debugging services and device traffic.
NetworkSpy in depth
Read the full write-up
NetworkSpy is a cross-platform HTTP/HTTPS debugging application for developers who need to inspect, alter, and replay application traffic. It is particularly suited to work involving gRPC, WebSockets, mobile proxies, or LLM streams. The free tier is a sensible starting point, but serious individual use requires a paid license and acceptance of a one-device limit.
Overview
NetworkSpy combines HTTPS interception, request metadata inspection, and side-by-side request comparison with tools for changing and reproducing traffic. Request and response editing, replay, breakpoint rules, and response mocking let you investigate not only what an application sent, but how it behaves when an exchange is paused or modified.
Its privacy boundary is clear for inspected traffic: network data remains on the user’s machine and is not collected or monitored by NetworkSpy. The service still collects email addresses, license keys, and anonymous device identifiers for account and licensing purposes, so local traffic handling does not eliminate account data collection.
Key features
Inspection and intervention: HTTPS interception and metadata views help isolate the important parts of an exchange. Editing, replay, breakpoints, and mocks make it practical to reproduce edge cases or test altered responses without changing the application itself.
Protocol coverage: gRPC support includes Protobuf decoding, while WebSockets provide real-time message streaming. That makes NetworkSpy more useful for structured and persistent connections than a tool limited to ordinary HTTP request-response traffic.
LLM analysis: The LLM analyzer visualizes streaming tokens, tracks token usage, and reports latency for each chunk. The free tier limits this analysis, so frequent model-debugging work points toward Personal or above.
Extensibility and integrations: A custom viewer builder can present proprietary binary or other structured data. Professional adds AI viewers with custom providers and a native Model Context Protocol bridge; Business adds SSO and SAML for organizational access control.
Mobile and team workflows: Physical iOS and Android devices can be configured to use NetworkSpy as a proxy. Team plans add shared billing, plugin presets, dashboards, audit activity, and larger seat allowances rather than merely extending a solo debugging setup.
Pricing
The Free plan costs nothing and includes core features, limited LLM token-stream analysis, breakpoints, resource mapping, the custom viewer builder, and scripting. It is appropriate for learning the workflow or occasional debugging, but the LLM cap and reduced scope make it a poor fit for sustained specialist use.
Personal is $18 a year, billed $18/year, for one device. It adds the full HTTP debug proxy kit, GraphQL and JSON inspectors, the LLM Token Analyzer, and Custom Viewer Builder + AI. This is the economical choice for one developer who needs complete inspection tooling, provided work stays on a single machine.
Professional costs $29 a year, billed $29/year. It includes Personal’s features, AI viewers with custom providers, MCP, and priority email support. It suits developers integrating traffic analysis into AI-oriented workflows or needing faster support, but the individual license remains one device.
Team Starter is $49 a month for up to five users, with centralized billing, shared plugin presets, and a standard team dashboard. Business costs $149 a month for up to 20 users and adds audit logs and activity, SSO/SAML, and priority 24/7 support. Enterprise uses custom pricing for unlimited seats, custom security reviews, on-premise deployment, and a dedicated account manager. The Lifetime plan is 99.00 USD once, with everything in Pro, beta features, and lifetime updates; it is the clearest fit for a solo buyer who wants to avoid recurring annual charges.
A free trial is offered. The pricing page promises a 30-day money-back guarantee, while the Terms of Service generally deny refunds except where law or a specified refund policy requires them; buyers should resolve that distinction before paying. Team licenses are per-seat, and individual licenses are limited to one device.
Platforms
NetworkSpy runs on macOS, Linux, and Windows. Downloads include Apple Silicon support, Debian and Ubuntu packages, and Windows 10/11 support. Physical iOS and Android devices can send traffic through it for inspection, although those mobile systems are proxy clients rather than listed desktop application platforms.
Who it's for
Choose NetworkSpy for application debugging that spans HTTPS, gRPC, Protobuf, WebSockets, or streamed LLM responses, especially when request mutation, replay, and breakpoints are central to the work. Personal and Professional suit individual developers; Team Starter and Business fit groups that need shared administration, while Enterprise targets organizations requiring on-premise deployment and custom security work. It is less attractive for someone who regularly switches between computers under one individual license or only needs basic HTTP viewing.
Pros and cons
Pros
Broad protocol coverage, including Protobuf-decoded gRPC and live WebSocket messages.
Strong intervention toolkit: editing, replay, breakpoints, response mocks, and comparisons.
Local handling of inspected traffic, with useful custom viewers and AI-stream metrics.
Plans scale from free use to SSO, audit logs, on-premise deployment, and dedicated support.
Cons
Individual licenses permit only one device, limiting developers who move between machines.
The free plan restricts LLM token-stream analysis, so model-focused users may need to pay.
Business costs $149 a month, and Enterprise pricing is custom.
The 30-day guarantee and generally non-refundable terms are not aligned, creating purchase uncertainty.
Alternatives
For a broader shortlist, see Web Debugging Proxies.
HTTP Toolkit is the better pick when Android, iOS, web access, or built-in HTTP client tools matter alongside interception and breakpoints.
Moni Proxy fits users who want a free plan with explicit mock, rewrite, DNS, ignore-host, and daily compose-request caps.
ProxyHawk is an option for Android and iOS work where a monthly plan includes three devices and unlimited traffic.
Reqable suits those who prefer a free one-device plan with 100MB storage and small rule quotas.
Fluxzy is worth considering for personal-use desktop, mobile, API, or self-hosted deployments.
Fiddler Everywhere is a paid alternative with a trial and a Lite plan at $10 a month.
Probe is an alternative with free HTTPS interception, mobile debugging, breakpoints, JavaScript scripting, and saved sessions.
Proxyman is a paid alternative offering a limited evaluation plan.
Verdict
NetworkSpy is a strong choice for developers who need one desktop proxy to dissect and manipulate conventional, streaming, and AI-related traffic. Its main reason to choose it is the combination of protocol breadth, replay controls, and token-level LLM analysis. Look elsewhere if a one-device individual license is impractical, if you need a lower-cost multi-device setup, or if the refund wording is unacceptable.
Verdict
NetworkSpy covers request inspection, replay, breakpoints, and several protocol types, with a stated local handling approach for inspected traffic. Review the feature limits and license terms, and note that the pricing page and terms describe refund conditions differently.
Where Specifiction places it
- Web Debugging Proxies#3 of 279.1
