Built a Grammarly-like Mac app with Jev.

@nielsmouthaan Niels Mouthaan · Sep 17, 2026 · case #577665
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Built a Grammarly-style Mac app on Jev to test how fast structured decisions feel inside a real writing tool.

The original post

Built a Grammarly-like Mac app with Jev.

Jev is TypeSafe’s first “System One Model”, built for fast, structured decisions rather than generating text like an LLM.

I wanted to see how fast that feels in a real app.

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Numbers are a snapshot taken from X when the case was added to the library (schema v1, collected 2026-09-19); they will not match today.

Where this case fits

Filed under general Jev builds. In the pattern Jev is built for, the model answers a bounded question per step — and ordinary code acts on the answer, because the answer is already a value rather than a paragraph. Browse the full case library for the work it sits next to.

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Last updated: 2026-09-22 · sources & corrections · every card links to its author's original post