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TypeSafe AI· Released Sep 15

Jev

Jev is TypeSafe AI's first public System One decision model: it answers closed questions (labels, yes/no, scores, choices) with structured output in milliseconds for a fraction of a cent, rather than generating prose.

Smart copy and paste that decides what to pasteSep 20

Entries

Rishi Raj Jain

@rishi_raj_jain_ · Sep 22

Jev plays Flappy Bird: a games & real time build posted by Rishi Raj Jain (@rishi_raj_jain_) that puts Jev, TypeSafe AI's System One decision model, to work, with a demo video on the post.

syumai

@__syumai · Sep 22

Syumai built a CLI wrapper that uses Jev to suggest the right subcommand from meaning rather than typo distance, so 'git record' suggests 'git commit'.

Wahab Khan

@chaosengineerr · Sep 22

Reply-guy stamper: a tools & apps build posted by Wahab Khan (@chaosengineerr) that puts Jev, TypeSafe AI's System One decision model, to work, with a demo video on the post.

appcypher

@theappcypher · Sep 18

Mario Never Dies: a games & real time build posted by appcypher (@theappcypher) that puts Jev, TypeSafe AI's System One decision model, to work, with a demo video on the post.

Arpit Khandelwal

@ArpitKhandelwa3 · Sep 22

LinkedIn slop filter: a content & growth build posted by Arpit Khandelwal (@ArpitKhandelwa3) that puts Jev, TypeSafe AI's System One decision model, to work, with a demo video on the post.

Maitree Mervana Parekh

@maitreemervana · Sep 25

Maitree turned raw videos of a wardrobe into a catalog and outfit generator, with Jev classifying each item and powering the semantic search bar.

gabidev

@GabiDev98 · Sep 21

Gabi built an open-source trading agent that uses Jev to place predictions on Polymarket's five-minute BTC up/down market and showed a winning trade.

Rishi Raj Jain

@rishi_raj_jain_ · Sep 17

Rishi Raj Jain redacts only the personal details in support messages rather than blanking whole columns, using Jev inside Neon Postgres.

Christopher Lee

@chris_not_busy · Sep 22

Chris built a clinical simulation where Grok proposes moves and Jev evaluates them at speed, exploring over twenty possible futures for a cancer patient in minutes.

Reinhard Zach

@mrza_ch · Sep 26

Mrza put Jev in a driving simulation where a small in-browser vision model describes the road and Jev decides whether to stop for a child, dog or teddy bear.

Hiroyuki Ota (ほた)

@hota911 · Sep 19

Hota911 let Jev play Puyo Puyo, giving it each candidate placement result and asking four questions per move: which phase of play, then which result is best.

Mario Jankovic

@mariojankovic · Sep 18

Mario Jankovic made an extension that combines YouTube's AI labels with each video's title and description so Jev can hide AI slop from your feed.

Wilson Lora 🇩🇴

@b0dre · Sep 22

B0dre built a movie search that runs Laya on his own machine and Jev over the API on the same query, finding local at 392 ms versus 676 ms via the API.

Carl Aiau

@carlaiau · Sep 22

Carl Aiau built an open-source reader where Jev highlights the emotion of each sentence as you scroll through Dostoevsky, plus a character map of the whole book.

Jev: quick answers

What can you build with Jev?
People have published 180 public builds made with Jev. The most common uses are productivity (35), coding (29), games (24), agents (23) and content (21).
What are the best Jev GitHub repos?
The most-starred open-source Jev projects in the index are laya: Non-autoregressive System 1 decision engine. Typed choice, score and y, jev-ultrafast: Fastest and cheapest web agent and kev: Jev-like family of decision models built on top of Qwen3.5/3.8 you can.
Where do people share Jev projects?
Mostly on X, GitHub and Web, from 164 creators between Sep 15 and Oct 1.