Fluxzy

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Score7.4

Rank#2 of 27

PriceFree

Free planYes

Runs onAndroid, API, iOS, Linux, macOS, Self-hosted, Windows

Summary

Fluxzy is an HTTP proxy for recording, examining, debugging, and changing HTTP/1.1, HTTP/2, and WebSocket traffic over plain or secure connections. Its proxyless capture can record app traffic without proxy setup, including apps that disregard system proxy settings. Rules can edit request and response headers, add authentication, simulate slow networks, forward requests, spoof DNS, alter TLS fingerprints, and force HTTP versions. Fluxzy also decodes gRPC and Protobuf traffic, with real field names available from .proto files, and can inspect OpenAI, Anthropic, and Google Gemini API traffic, including streaming responses and tool calls. Captures can be exported to formats such as HAR, PCAPNG, cURL commands, and native .fxzy files. It works offline without an account or cloud sync, and its site says it has no telemetry. The free Community edition includes all features but is for personal use and adds an x-fluxzy-community header. Pro costs 49.00 EUR per once for one developer; Enterprise costs 59.00 EUR per once with a three-seat minimum.

Who it is for

Fluxzy is aimed at developers and security engineers who need to inspect or modify application traffic. Its mobile capture options cover Android apps through a local VPN and iOS apps routed to the proxy.

What is good

Captures traffic without proxy configuration
Decodes gRPC and Protobuf traffic
Works offline without an account or cloud sync
Exports captures to several common formats

What to know first

Free Community edition is limited to personal use
Free edition adds an x-fluxzy-community header
Enterprise requires at least three seats

Verdict

Fluxzy combines traffic capture, inspection, editing, and export options, including for gRPC and LLM API traffic. The free edition has a personal-use restriction, while paid licenses remove it.

Fluxzy plans and pricing

All plans

Community Edition Free Personal use · x-fluxzy-community header · all features included fluxzy.io · 30 Sept 2026

Pro (Perpetual) €49 once Pay once, own forever One developer · No personal-use restriction · Windows, macOS, Linux fluxzy.io · 30 Sept 2026

Enterprise (Perpetual) €59 once One-time payment Minimum 3 seats · €59/seat for 1–9 · €49/seat for 10–49 · €39/seat for 50+ fluxzy.io · 30 Sept 2026

Compared on web debugging proxies

Free plan: Yesfluxzy.io
Request/response editing: Yesfluxzy.io
Breakpoint rules: Yesfluxzy.io
Traffic replay: Yesfluxzy.io
Response mocking: Yesfluxzy.io
WebSocket inspection: Yesfluxzy.io
Proxy chaining: Yesfluxzy.io

Facts

What it does: Fluxzy is an HTTP intermediate and man-in-the-middle proxy for recording, analyzing, debugging, and altering HTTP/1.1, HTTP/2, and WebSocket traffic over plain or secure channels.fluxzy.io · 30 Sept 2026
Proxyless capture: Proxyless capture records applications’ HTTP and HTTPS traffic without proxy configuration, including apps that ignore system proxy settings.fluxzy.io · 30 Sept 2026
Traffic modification: Rules can modify request and response headers, inject authentication, simulate slow networks, forward requests, spoof DNS, change TLS fingerprints, and force HTTP versions.fluxzy.io · 30 Sept 2026
gRPC debugging: Fluxzy decodes gRPC and Protobuf traffic with schema-less decoding or real field names supplied from .proto files.fluxzy.io · 30 Sept 2026
LLM API inspection: Fluxzy can capture and inspect OpenAI, Anthropic, and Google Gemini API requests and responses, including streaming responses and tool calls.fluxzy.io · 30 Sept 2026
Exports: Fluxzy exports captures as HAR, Fiddler SAZ, PCAPNG for Wireshark, cURL commands, .http files, and native .fxzy files.fluxzy.io · 30 Sept 2026
Integrations: Official NuGet packages provide Fluxzy engine access for .NET Standard 2.1, .NET 6, and .NET 8 applications.fluxzy.io · 30 Sept 2026
Offline and telemetry: Fluxzy works offline without an account or cloud sync, and the site states that it has no telemetry.fluxzy.io · 30 Sept 2026
Open-source status: Fluxzy.Core is open source under GPLv3, while the Fluxzy Desktop application is not open source.fluxzy.io · 30 Sept 2026
Binary security: Desktop downloads publish SHA-256 checksums, CLI downloads publish SHA-512 checksums, Windows binaries are Authenticode-signed, and macOS builds are Apple-signed and notarized.fluxzy.io · 30 Sept 2026
Mobile capture: Fluxzy Connect captures Android app traffic through a local VPN, while iOS apps can be routed to the proxy for inspection.fluxzy.io · 30 Sept 2026
License limits: The free Community edition is intended for personal use and adds an x-fluxzy-community header; paid licenses remove that header and the personal-use restriction.fluxzy.io · 30 Sept 2026
Refund policy: Fluxzy offers a full refund when contacted within 14 days of purchase.fluxzy.io · 30 Sept 2026
Audience: Fluxzy describes itself as a debugging tool for developers and security engineers.fluxzy.io · 30 Sept 2026