Best Charles Proxy Alternatives for macOS in 2026

Charles Proxy has been the default HTTP debugging tool for over fifteen years, but its Java-based Swing UI and $50 license fee push many developers to look elsewhere. The best alternatives in 2026 are Rockxy (open-source, native macOS), Proxyman (native macOS, freemium), mitmproxy (CLI, cross-platform, MIT-licensed), HTTP Toolkit (Electron, cross-platform), and Fiddler (Windows-first, .NET-based).

Quick comparison

1. Rockxy

Rockxy is an open-source HTTP/HTTPS debugging proxy built natively for macOS with SwiftUI and AppKit. The proxy engine runs on SwiftNIO, and the entire codebase is licensed under AGPL-3.0.

Every core feature ships free: HTTPS interception, request/response breakpoints, JavaScript scripting, Map Local/Remote rules, side-by-side response diffing, HAR import/export, and a request timeline with DNS/TCP/TLS/TTFB waterfall breakdown. There is no account system, no telemetry, and no cloud dependency. Your traffic stays on your machine.

Strengths: Fully open source. Native macOS performance -- no Electron, no JVM. All debugging features included without a paywall. Active development with frequent releases.

Weaknesses: macOS-only. Younger project than Charles or Proxyman, so the plugin ecosystem and community are still growing. No iOS simulator auto-capture yet.

See how Rockxy stacks up feature-by-feature on the comparison page, read the focused Proxyman alternative guide, or grab it from the download page.

2. Proxyman

Proxyman is a closed-source, native macOS proxy with a polished UI. It launched in 2019 and has built a solid reputation for design quality and iOS simulator integration. If you work with iOS apps daily, the automatic simulator certificate setup is genuinely useful.

The free tier covers basic HTTP/HTTPS inspection. But breakpoints, scripting (both JavaScript and Python), Map Local, and advanced filtering require a paid license at $69/year or $99 for a lifetime seat.

Strengths: Mature native macOS app. Excellent iOS/tvOS simulator support. Good documentation. Stable release cadence.

Weaknesses: Closed source -- you cannot audit what happens to your traffic data. Core debugging features (breakpoints, scripting) are paywalled. Includes telemetry by default. macOS-only.

3. mitmproxy

mitmproxy is a Python-based, MIT-licensed proxy that runs from the terminal. It also ships mitmweb, a browser-based UI for inspecting traffic visually. Cross-platform (macOS, Linux, Windows).

Where mitmproxy excels is scriptability. You write Python scripts that hook into any point in the request/response lifecycle -- modify headers, rewrite bodies, inject delays, log to external systems. For automation and CI pipelines, it's hard to beat.

Strengths: Fully open source (MIT). Extremely scriptable with Python. Cross-platform. Large community and extensive documentation. Works well in headless/CI environments.

Weaknesses: No native GUI -- mitmweb is functional but basic compared to dedicated desktop apps. Steep learning curve if you're not comfortable with CLI tools. Setting up HTTPS certificate trust on macOS requires manual Keychain steps. Performance with very large captures (100k+ requests) can degrade in mitmweb.

4. HTTP Toolkit

HTTP Toolkit is an Electron-based proxy with a clean web UI. The core proxy and UI are open source (AGPL-3.0). It runs on macOS, Linux, and Windows.

The standout feature is one-click browser and Android device interception -- it launches a pre-configured browser instance or connects to an Android device with minimal setup. The free tier covers basic interception. Pro ($14/month) adds breakpoints, performance analysis, and advanced matching rules.

Strengths: Cross-platform. Good browser and Android interception. Open source core. Clean, modern interface.

Weaknesses: Electron-based, so it draws more memory and CPU than a native app on macOS. Advanced features require a Pro subscription. No native macOS look and feel. WebSocket and GraphQL support are less mature than dedicated native tools.

5. Fiddler

Fiddler has been around since 2003. The original Fiddler Classic is a .NET/Windows application -- still used heavily in enterprise environments. Telerik (Progress Software) now maintains two versions: Fiddler Classic (Windows-only, free) and Fiddler Everywhere (Electron, cross-platform, paid).

On macOS, your only option is Fiddler Everywhere, which requires a license ($12/month or $10/month billed annually). It covers HTTP/HTTPS inspection, rules, and API composing.

Strengths: Long track record. Deep .NET/Windows ecosystem integration. Fiddler Classic is free on Windows. Large knowledge base and community from two decades of use.

Weaknesses: Fiddler Everywhere on macOS is Electron -- not native. Requires a paid subscription for Mac use. The Classic version doesn't run on macOS at all. The product direction has shifted heavily toward enterprise/team features.

Which one should you choose?

There is no single right answer. It depends on your platform, budget, and how you work.

• macOS + open source: Rockxy. All features free, AGPL-3.0 licensed, native SwiftUI app. Best fit if you want full transparency and don't need cross-platform.
• macOS + mature ecosystem: Proxyman, if you have the budget. The iOS simulator integration and years of polish make it a reliable choice for mobile-heavy teams.
• Cross-platform CLI power user: mitmproxy. Python scripting, CI-friendly, MIT-licensed. Ideal for automation-heavy workflows or teams on mixed OS environments.
• Cross-platform GUI: HTTP Toolkit. Electron-based but well-designed, with strong browser and Android interception. Good middle ground between CLI and native.
• Windows-primary team: Fiddler Classic (free) or Fiddler Everywhere (paid). Two decades of Windows ecosystem integration is hard to replicate.

If you're on macOS and want to try the open-source route, Rockxy is worth a look. Every feature in the table above -- breakpoints, scripting, diff, rules engine -- ships included.