Every developer tool says "no lock-in" on its landing page. It's the cheapest promise in software — easy to write, almost never tested, and by the time you find out it wasn't true, you've already built six months of work on top of it.
So instead of saying it, here's the test we hold ourselves to. One question, and it's the only one that matters.
The exit test
Stop using the tool tomorrow. Is your project still standard, shippable code that runs without it?
That's it. Not "can you export." Not "is there a migration path." Those are consolation prizes you accept after you've already been locked in. The real question is whether the tool ever inserted itself into your source in the first place.
Run that test against most visual editors and the answer is no:
Export-and-fork tools — the moment you export and hand-edit, the tool and your repo are separate forever. There's no exit back; the design tool can't read your changes. You don't own one project, you maintain two.
SDK-ownership tools — your components live in a proprietary model, rendered by the tool's runtime. "Stop using it" means migrating a schema, rewriting components, untangling a dependency you can't remove. The exit cost is the lock-in.
AI app generators — better here, since they hand you code and walk away. But they also walk away from the next change. They don't stay in sync with the source, because they were never connected to it.
The pattern: every one of them either never touched your real code, or touched it in a way you can't undo. Sovereignty is the opposite of both — the tool works on your real source, and leaves nothing behind when it goes.
What we put in writing
We call this principle developer sovereignty, and we made it a concrete guarantee, not a vibe:
The code processed by CrossUI Studio is standard React code. We promise not to embed any proprietary runtimes, closed-source dependency packages, or any logic "traps" that cannot run outside the platform into your source files. If you stop using CrossUI Studio, your project remains a standard React project — no migration effort required.
Three things that are not in your files after Studio touches them:
No proprietary runtime. Nothing your app needs to import from us to render. It runs on plain React, the same as before.
No closed-source dependencies. We don't slip a package into yourpackage.jsonthat only resolves through us.
No platform-locked logic. No magic comments, no special syntax, no node that only means something inside our canvas.
What's left in your repo is what a senior engineer on your team would have typed by hand. That's the whole point.
Why we can actually promise this
Most tools can't make this promise because of how they're built. If a tool owns a rendering model — its own representation of your component tree — then "saving" means serializing that model back to code. Serialization is lossy. The tool writes what it knows and discards what it doesn't, which is why exported code looks subtly foreign and why re-emitting a file strips your comments.
Studio is built the other way around. Your source code's AST is the single source of truth, and every surface — the canvas, the inspector, the code editor — is just a view over that AST. We never hold a parallel model that has to be flushed back to disk. When you change a prop on the canvas, we patch the one AST node that changed and write back only the bytes that moved.
The consequence you can see in git diff: a padding change is one line. Indistinguishable from what you'd have typed. And because we never owned anything but a view, there's nothing to take with us when you leave — the source was always yours, the whole time.
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