@nielsmouthaan built a Grammarly-like Mac app with Jev, which they describe as TypeSafe’s first System One model for fast structured decisions rather than text. The point of the app was to feel that speed.

Niels Mouthaan (@nielsmouthaan) published this on 2026-09-17. @nielsmouthaan built a Grammarly-like Mac app with Jev, which they describe as TypeSafe’s first System One model for fast structured decisions rather than text. The point of the app was to feel that speed. 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. https://t.co/XIFYnHXO7Y How Jev or TypeSafe is used, in the post's own words: “Built a Grammarly-like Mac app with Jev.” The post does not name a separate audience. It is for people reading what @nielsmouthaan shows here (it includes media).