Last updated: 2026-09-20 · Project descriptions from public demos and author posts
The Jev Ecosystem
Within days of launch, developers started building on Jev's typed-decision primitive — agents, guardrails, database filters, games, and even an open-source reproduction of the interface itself. This directory tracks the notable ones.
Open-source reproduction
openjev
Reproduces the Jev interface pattern on a small open model by reading typed option probabilities off the logits. The community's answer to “is this a durable primitive or a vendor wrapper?” — apparently durable.
Agents
jev-ultrafast
Browser Use's agent with Jev as its decision layer — completed a Zürich→London Google Flights search in 7.1 seconds.
mobile-jev
Droidrun's phone agent drove Uber on a real Android device: 9 actions in ~21 seconds (no booking completed).
typesafe-computer-use
Computer-use agent with Jev as the cheap gatekeeper for every action.
heist-one
Jev runs the guard AI logic in a heist game demo — decisions, not scripts.
Infrastructure & tooling
jev-guard
Rates every agent tool call as deny / ask / allow against your rules before execution.
pg-jev
Adds plain-language filtering to Postgres queries via Jev decisions.
HA-Jev
Turns Jev answers into Home Assistant entities for smart-home logic.
jevmeter
Scores every sentence of a video debate for about $0.05 total.
Typewriter
Steve Krouse's live typing demo — 16 Jev judgments update in real time as you type.
jev-trader
Market-signal experiments. Independent testing showed Jev does no better than a coin flip on short-horizon prediction — see the rule.
Want to be listed?
Building something with Jev? It'll likely show up on Hacker News or X — our tracker picks it up from there and adds it here automatically, or reach out with a link.