Fluxzy
fluxzy.io
What it is
Fluxzy is an HTTP proxy for recording, analyzing, debugging, and changing HTTP/1.1, HTTP/2, and WebSocket traffic, over plain or secure channels. Its proxyless capture records application traffic without proxy configuration, including apps that ignore system proxy settings. Rules can change headers, add authentication, simulate slow networks, forward requests, spoof DNS, alter TLS fingerprints, and force HTTP versions. It can decode gRPC and Protobuf traffic, and inspect OpenAI, Anthropic, and Google Gemini API requests and responses, including streams and tool calls. Captures can be exported as HAR, Fiddler SAZ, PCAPNG, cURL commands,.http files, or native.fxzy files. Fluxzy works offline without an account or cloud sync, and its site says it has no telemetry. Community is free for personal use and adds an x-fluxzy-community header. Pro is €49, paid once; Enterprise is €59, paid once with a three-seat minimum.
Spec sheet
- What it does
- Fluxzy is a streaming man-in-the-middle debugger that records, inspects, modifies and replays HTTP, HTTPS, HTTP/2, WebSocket and gRPC traffic.Read 15 Oct 2026 · fluxzy.io
- Audience
- Fluxzy describes itself as a debugging tool for developers and security engineers.Read 30 Sep 2026 · fluxzy.io
- Integrations
- Official NuGet packages provide Fluxzy engine access for .NET Standard 2.1, .NET 6, and .NET 8 applications.Read 30 Sep 2026 · fluxzy.io
- License
- Fluxzy.Core is GPLv3; the Desktop application is proprietary, and a separate commercial license is offered for closed-source embedding.Read 15 Oct 2026 · fluxzy.io
- Headquarters
- Paris, FranceRead 23 Sep 2026 · fluxzy.io
- Android app
- Google Play describes Fluxzy Connect as a companion for Fluxzy Desktop and CLI with SOCKS5 authentication and per-app VPN routing.Read 15 Oct 2026 · play.google.com
- Android data safety
- Google Play lists no third-party data sharing and no data collection for Fluxzy Connect.Read 15 Oct 2026 · play.google.com
- API and SDK
- Official NuGet packages Fluxzy.Core and Fluxzy.Core.Pcap expose the engine for .NET Standard 2.1, .NET 6 and .NET 8 applications.Read 15 Oct 2026 · fluxzy.io
- 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.Read 30 Sep 2026 · fluxzy.io
- Breakpoints
- Live breakpoints can pause traffic at DNS lookup, request and response stages for stepwise editing.Read 15 Oct 2026 · fluxzy.io
- CLI
- Fluxzy CLI is an open-source command-line tool for capture, certificate management, rule application, archive reading and export.Read 15 Oct 2026 · fluxzy.io
- Company establishment address
- Google Play identifies the Fluxzy developer address as 8 Rue Moinot, 78510 Triel-sur-Seine, France.Read 15 Oct 2026 · play.google.com
- Documentation depth
- The .NET documentation includes getting-started material, API reference pages, more than 20 examples and rule-action references.Read 15 Oct 2026 · docs.fluxzy.io
- Exports
- Fluxzy exports captures or requests to HAR, SAZ, PCAPNG, cURL, .http files and its native archive format.Read 15 Oct 2026 · fluxzy.io
- gRPC and Protobuf
- gRPC messages can be decoded without a schema or with field names supplied from .proto files.Read 15 Oct 2026 · fluxzy.io
- gRPC debugging
- Fluxzy decodes gRPC and Protobuf traffic with schema-less decoding or real field names supplied from .proto files.Read 30 Sep 2026 · fluxzy.io
- Independent product classification
- AlternativeTo lists Fluxzy Desktop as proprietary and free for personal use, with perpetual pricing shown between $49 and $96.Read 15 Oct 2026 · alternativeto.net
- Independent repository activity
- The public GitHub repository shows about 370 stars, 29 forks and more than 2,190 commits.Read 15 Oct 2026 · github.com
- JWT decoding
- Fluxzy automatically decodes bearer JWT headers and displays claims such as issuer, subject, audience and expiry.Read 15 Oct 2026 · fluxzy.io
- 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.Read 30 Sep 2026 · fluxzy.io
- Limit: browser hooking
- The launch-and-hook browser method cannot attach to an already-running browser and starts a fresh profile without saved passwords, cookies or extensions.Read 15 Oct 2026 · fluxzy.io
- Limit: HTTPS setup
- HTTPS decryption requires installing and trusting a Fluxzy root certificate on the client device.Read 15 Oct 2026 · fluxzy.io
- Limit: raw capture dependencies
- Raw packet capture requires an external compatible capture engine such as libpcap, WinPcap or an equivalent library.Read 15 Oct 2026 · fluxzy.io
- LLM API inspection
- Fluxzy can capture and inspect OpenAI, Anthropic, and Google Gemini API requests and responses, including streaming responses and tool calls.Read 30 Sep 2026 · fluxzy.io
- LLM debugging
- The debugger can inspect OpenAI, Anthropic and Gemini requests, streaming responses and tool calls.Read 15 Oct 2026 · fluxzy.io
- Maker headquarters
- The company page says Fluxzy SAS is registered in Paris, France.Read 15 Oct 2026 · fluxzy.io
- Maker legal name
- The Desktop EULA identifies Fluxzy SAS as a French company and gives SIREN 979 280 075.Read 15 Oct 2026 · fluxzy.io
- Mobile capture
- Fluxzy Connect captures Android app traffic through a local VPN, while iOS apps can be routed to the proxy for inspection.Read 30 Sep 2026 · fluxzy.io
- Mobile support
- Fluxzy Connect routes Android traffic through a local VPN, while iOS devices are configured to use Fluxzy as a Wi-Fi proxy.Read 15 Oct 2026 · fluxzy.io
- Mocking
- Mock-response rules return configured status codes, headers and bodies without requiring a backend.Read 15 Oct 2026 · fluxzy.io
- Offline and telemetry
- Fluxzy works offline without an account or cloud sync, and the site states that it has no telemetry.Read 30 Sep 2026 · fluxzy.io
- Offline operation
- Fluxzy Desktop is described as fully offline, with captured data staying on the local machine and no telemetry in the Community edition.Read 15 Oct 2026 · fluxzy.io
- Open-source status
- Fluxzy.Core is open source under GPLv3, while the Fluxzy Desktop application is not open source.Read 30 Sep 2026 · fluxzy.io
- Performance limit
- The repository benchmark reports lower throughput through the proxy than direct Kestrel traffic in each tested HTTP/1.1 and HTTP/2 scenario.Read 15 Oct 2026 · github.com
- Praise: live editing
- An AlternativeTo reviewer praised the Community edition for exposing premium-like features and making live editing easy to use.Read 15 Oct 2026 · alternativeto.net
- Protocol support
- The product supports HTTP/1.1, HTTP/2, WebSocket, gRPC and SOCKS5 traffic.Read 15 Oct 2026 · fluxzy.io
- Proxyless capture
- Transparent capture can intercept system traffic without proxy settings, environment variables or per-application configuration.Read 15 Oct 2026 · fluxzy.io
- Rating on Softpedia
- 5.0 out of 5 from 1 voteRead 15 Oct 2026 · softpedia.com
- Raw packet capture
- Fluxzy can save raw network packets as PCAPNG and include TLS key material for Wireshark analysis.Read 15 Oct 2026 · fluxzy.io
- Refund policy
- Fluxzy offers a full refund when contacted within 14 days of purchase.Read 30 Sep 2026 · fluxzy.io
- Rule engine
- Rules can change headers and bodies, inject authentication, throttle traffic, forward requests, spoof DNS and force protocol settings.Read 15 Oct 2026 · fluxzy.io
- Security of downloads
- Desktop binaries have SHA-256 checksums, CLI binaries have SHA-512 checksums, Windows builds are Authenticode-signed and macOS builds are Apple-signed and notarized.Read 15 Oct 2026 · fluxzy.io
- Self-hosting
- The CLI can run in Docker with the published fluxzy/fluxzy image for server and CI use.Read 15 Oct 2026 · fluxzy.io
- System requirements
- Desktop requirements are macOS 10.13 or newer, Windows 10 or newer x64, or Linux x64 with WebKitGTK, about 300 MB disk, 4 GB RAM and a 1170×740 minimum window.Read 15 Oct 2026 · fluxzy.io
- Traffic inspection
- Captured exchanges expose headers, bodies, connection details, TLS information, IP addresses and timing breakdowns.Read 15 Oct 2026 · fluxzy.io
- 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.Read 30 Sep 2026 · fluxzy.io
Plans and prices
Enterprise (Perpetual) — 1–9 seats €59, paid once Minimum 3 seats 1–9 seats · Minimum 3 seats Read 20 Sep 2026 · fluxzy.io
Enterprise (Perpetual) — 10–49 seats €49, paid once Minimum 3 seats 10–49 seats · Minimum 3 seats Read 20 Sep 2026 · fluxzy.io
Enterprise (Perpetual) — 50+ seats €39, paid once Minimum 3 seats 50+ seats · Minimum 3 seats Read 20 Sep 2026 · fluxzy.io
Community Edition Free all features · personal use · adds x-fluxzy-community header · no telemetry Read 15 Oct 2026 · fluxzy.io
Pro (Perpetual) €49, paid once one-time payment all Community features · commercial use · removes community header · one developer Read 15 Oct 2026 · fluxzy.io
Enterprise (Perpetual) €59, paid once one-time payment minimum 3 seats · 59 EUR for 1–9 seats · 49 EUR for 10–49 · 39 EUR for 50+ · centralized seat management Read 15 Oct 2026 · fluxzy.io
Strong points and limits
Strong points
- Captures traffic without proxy configuration
- Can edit requests and responses
- Decodes gRPC and Protobuf traffic
- Exports to HAR, PCAPNG, and other formats
- Works offline without an account or cloud sync
Limits
- Free Community edition is for personal use
- Community adds an x-fluxzy-community header
- Enterprise has a three-seat minimum
- Desktop application is not open source
Who it suits
Fluxzy is aimed at developers and security engineers who need to inspect or change application traffic. Its mobile capture options cover Android apps through a local VPN and iOS apps routed to the proxy.
Verdict
Fluxzy combines traffic capture, editing, protocol decoding, and multiple export formats. The free edition includes all features but carries personal-use and header limits; paid licenses remove those restrictions.
Where Specifiction places it
- Web Debugging Proxies#1 of 279.4
