Two Mac apps that put coding agents on Apple's toolchain. Prices and features checked October 30, 2026.

TLDR;

Bitrig is built to get an app to exist. Flowdeck is built for the engineer who has to keep it working.

If you want an app quickly and you're happy letting the tool make the decisions, Bitrig fits. If you write Swift for a living, or you want what you prototype today to survive the next two years, Flowdeck does.

Both are Mac apps, both run your agent against Apple's toolchain, both open real Xcode projects. That's where the overlap ends. Bitrig is a chat that produces an app. Flowdeck is an engineering environment where agents work under the same rules you would: your project, your standards, your definition of done.

Side by side

Who's in the chair

You can describe an app to either one and get it built. The difference is what comes back, and who each one assumes will maintain it.

Bitrig turns your description into Swift and assumes you'd rather not look underneath. It calls itself a vibe coding app, and its iPhone app is pitched as a way to learn to write Swift apps with no coding experience required. Its site keeps coming back to one promise: you never have to leave Bitrig. CloudKit has sharp edges, they say, and Bitrig handles them.

For a prototype, that's right. The tool makes the decisions so you don't have to. The team behind it built SwiftUI, and the polish shows, 3D simulators and all.

Flowdeck assumes an engineer will survive the prototype. Describe the same app and you get an architecture you'd keep and tests that run, because the agent works inside coding standards and best practices built over years of shipping Apple apps. With Flowdeck you can prototype in an afternoon and then keep going in the same tool when it gets real.

And when it gets real, the sharp edges are the job. Once thousands trust you with their data, a CloudKit schema change isn't a detail you hand to a tool. A bad migration doesn't break a demo. It breaks someone's data, on devices you can't reach. That's a decision you make, review and own. Flowdeck hands it back to you.

Code Standards and validation

Bitrig runs your agent with whatever skills you bring. Flowdeck doesn't leave that to chance. Every session starts with Flowdeck's Apple skill pack: coding standards and best practices, covering SwiftUI, concurrency, Apple frameworks and the build and test loop. Same rules for Claude Code, Codex or your favorite agent.

Bitrig tests by tapping through the app like a user. Flowdeck does that too, but also makes the agent prove the change: it builds, runs the tests that cover it, walks the flow it touched and reports exactly what it checked, at the depth you pick. Anything that fails goes back to the agent and comes back verified, not promised.

Xcode project support

This is the part a prompt-to-app tool keeps out of sight, and it's where engineers actually spend the week.

Flowdeck reads and manages the whole project: workspaces, schemes, targets, build configurations, destinations and test plans. Per-scheme overrides, build setting overrides, xcodebuild arguments and environment variables live in one config that Studio, the CLI, your agent and your CI all read. The build your agent runs is the build CI runs.

Bitrig understands Xcode projects and can open them and run your app, but it stops there.

Automation

Apple gives you xcodebuild, simctl and a GUI. The glue between them has always been your problem. Flowdeck is that glue.

In Flowdeck, build failures come back as structured diagnostics. Launched apps are registered and watched, so a crash is an event your agent sees, not a window that quietly disappears. Every command exits with a code that tells CI whether configuration, build, test or launch was what failed.

With Bitrig you can still automate testing, but it does not hand any diagnostic tools to your agent. When something fails, the only thing you can do is pretty much ask your agent to fix it.

In both, UI automation works through the accessibility tree on iOS simulators and on macOS apps: find, tap, type, swipe, pinch, rotate, assert, no UI test target required. Simulator state is one command away: location, push notifications, privacy permissions, Dynamic Type, appearance, language, status bar, pasteboard, keychain.

In Flowdeck, automation keeps going after the code. Open a pull request and PR Autopilot watches the checks, sends an agent to fix a failing build or a merge conflict, and iterates until everything is green.

Logs, data and performance

Bitrig uses xcodebuild and the raw Apple toolchain behind the scenes. And it works.

The difference is that Flowdeck commands wrap everything in structured NDJSON. It actually converts a 3,000-line xcodebuild failure into a 12-line typed error. Your agent reads the specific failure instead of the surrounding noise. Your scripts and CI systems use this same output format.

It's also where your tokens go. Flowdeck uses 99.99% fewer tokens to read the same clean build: 2.2 million tokens with raw xcodebuild (what Bitrig uses) versus 121 tokens with Flowdeck. With four agents building and testing in a loop all day, that's the difference between finishing the feature and waiting for the limit to reset.

Parallel work

Both run several agents at once, each with its own build data. Bitrig gives every agent its own worktree. Flowdeck can do the same, or run several agents in one worktree. The bigger difference is the simulator. Bitrig decides how many simulators to launch based on your Mac's memory and hands them between agents as needed. In Flowdeck every agent gets its own simulator and keeps it.

A simulator passed between agents can carry state: an installed build, granted permissions, data left over from the last agent's test. That's where the weird bugs live, the test that only fails after another agent used the device. I'd rather pay in memory. Flowdeck itself gets built this way, around 60 PRs per person every two weeks from parallel worktrees.

Agents and models

Both let you bring your own agent and your own subscription. Flowdeck works with Claude Code, Codex, OpenCode, and Cursor.

Flowdeck gives each job its own agent: one to plan, one to implement, a utility agent for commit messages and PR descriptions, each with its own model and effort. Plan with the expensive model, implement with the cheap one, and hand context from one provider to another without replaying the whole transcript.

Shipping

Bitrig puts release behind a button. It signs, provisions, uploads to TestFlight and submits for review without you opening Xcode or App Store Connect. If release is a chore you want gone, that's the point.

Flowdeck doesn't do that yet. But it's fair to say that most engineers already have a release process: their signing setup, their CI, their review checklist. Signing stays in CI, where you and your team already manage it.

Price

Bitrig is free for 10 messages a day, or $15 a month for Pro. That's $180 a year, on top of the AI subscription. Pro offers both a credit-based plan and bring-your-own-subscription.

Flowdeck Studio is $79 a year with the CLI included, on top of the AI subscription you already pay for. No credits. If Flowdeck disappeared tomorrow, your projects are still plain Xcode projects.

Which one

Pick Bitrig if you're new to iOS development and want to explore an idea, want the tool to make the decisions for you, and you're happy living inside one app.

Pick Flowdeck if you're an engineer, whether you start from a description or from a repo people already depend on, and you want agents working the way the rest of your engineering already works: in your repo, your terminal and your CI, held to real standards, with you deciding what merges.

The first weekend of your app is the fun part. Flowdeck is built for year three.