Charles Proxy vs Proxyman vs Rockxy: Which macOS HTTP Proxy Should You Use?

Three tools, one job

If you're a macOS developer who needs to inspect HTTP traffic, you've probably heard of Charles Proxy and Proxyman. Now there's a third option: Rockxy. All three let you intercept, inspect, and modify HTTP and HTTPS traffic. But they take very different approaches to the problem.

This isn't a feature-count competition. Different tools suit different developers. Here's an honest breakdown of what each offers, where each falls short, and when you should pick one over the others.

Feature comparison

Charles Proxy -- the veteran

Charles has been around since 2003. It's the tool most developers learn first, and for good reason: it works, it's documented extensively, and it runs on macOS, Windows, and Linux.

The trade-off is that Charles is a Java application. On macOS, it runs inside a JVM. The UI is Swing-based, which means it doesn't look or feel like a native Mac app. Keyboard shortcuts don't match macOS conventions. The window chrome is wrong. Text rendering is slightly off. None of this stops you from debugging, but after eight hours of use you feel the friction.

Charles costs $50 for a single-seat license. That's reasonable for a professional tool. It includes all features -- no freemium tiers.

Where Charles shows its age is in the feature set. No scripting support means you can't automate repetitive testing workflows. No diff view means comparing responses requires copy-pasting into an external tool. GraphQL support is limited to raw body display without operation parsing.

Charles is battle-tested. If you need a proxy that works on every platform and you've already invested in the workflow, there's no urgent reason to switch.

Proxyman -- the native champion

Proxyman is what happens when you build an HTTP proxy specifically for macOS and refuse to compromise on the UI. It looks native because it is native -- built with AppKit, designed to match macOS conventions, fast to launch, responsive at scale.

The development team ships regularly and maintains good documentation. The tool handles edge cases well: WebSocket, GraphQL, gRPC, and iOS simulator traffic out of the box. The scripting system uses JavaScript and is well-integrated.

The main consideration is the business model. Proxyman uses a freemium approach. The free tier covers basic inspection, but features like breakpoints, scripting, Map Local, and advanced rules require a paid license. If you need those features -- and most professional debugging workflows do -- you'll need to factor in the cost.

Proxyman is also closed-source. For many developers this doesn't matter. For some -- particularly those working in security-sensitive environments or those who want to audit what their tools do with network data -- it's a meaningful gap.

Rockxy -- the open-source newcomer

Rockxy takes a different position: fully open source (Apache 2.0), fully native (SwiftUI + AppKit), and fully free. Every feature ships to every user.

The proxy engine is built on SwiftNIO, the same framework Apple uses for server-side Swift. The request list uses NSTableView for virtual scrolling at 100,000+ rows. TLS interception uses the swift-certificates library with P-256 ECDSA keys.

Rockxy includes two features neither Charles nor Proxyman offer: a built-in diff view for comparing any two responses side by side, and JavaScript scripting without a paywall. It also has full breakpoint support for both requests and responses -- pause a request mid-flight, edit the URL, headers, or body, and forward the modified version.

The honest trade-off: Rockxy is newer. Charles has 20+ years of edge-case handling. Proxyman has a mature ecosystem with iOS helper apps, browser extensions, and a plugin system. Rockxy is shipping features at a rapid pace but hasn't accumulated the same depth of polish in every corner.

What Rockxy does have is transparency. The source code is on GitHub. There's no telemetry. No account required. No cloud dependency. If a proxy tool is going to sit between your apps and the internet, you can read exactly what it does.

When to choose each

Choose Charles Proxy if:

• You need cross-platform support (macOS, Windows, Linux)
• Your team already has Charles workflows and shared .chls session files
• You want a tool with two decades of stability behind it

Choose Proxyman if:

• Native macOS UI quality is your top priority
• You want commercial support and a company backing the product
• You need iOS simulator integration and browser extensions
• You're comfortable with a paid license for advanced features

Choose Rockxy if:

• Open source matters to you -- you want to read, audit, or modify the code
• Privacy is non-negotiable -- no telemetry, no cloud, no account
• You need diff and scripting without a paywall
• You want full breakpoint support (request + response) included
• You're contributing to the macOS developer tools ecosystem

Our honest take

We built Rockxy, so we're biased. We'll be upfront about that.

Charles and Proxyman are both good tools built by developers who care about their work. If you're happy with either, you don't need to switch. The ecosystem is better when multiple tools exist and push each other forward.

What we think was missing -- and what motivated building Rockxy -- is an HTTP debugging proxy that is simultaneously native, open source, and feature-complete. Charles is closed and non-native. Proxyman is native but closed and paywalled. Rockxy is all three.

We're still building. The feature gap is shrinking with every release. If open source and privacy matter to your workflow, give Rockxy a try. The code is on GitHub, and we'd appreciate a star if you find it useful.