The Jev ecosystem, mapped
Within a month of launch, a real ecosystem appeared. We track it here, grouped by what it tells us about the category. Star counts are a snapshot from mid-September 2026 and will drift.
Open-source replicas
The most telling signal: people are rebuilding the idea on open weights.
SemIf
Semantic "if" statements from open models, running on a local RTX 3090. Independent project, the flagship of the open-replica wave.
mini-jev
A small open re-implementation of the Jev judgment pattern.
Qwen-2.5-1B-RLCD
A 1B open model fine-tuned with the RLCD-style calibrated-decisions recipe.
Tooling & integrations
awesome-jev-by-typesafe
The official curated list: use cases, patterns, prompts, starter code.
pg-jev
A Postgres extension — ask your tables questions in plain language, get typed answers.
jev-browser
Browser automation driven by Jev — operation and target decided in one round trip.
foreman
Orchestration/tooling built around Jev judgments.
Demos & agents
jev-review
A staged code-review workflow and local dashboard built on Jev.
typesafe-mario
A Jev agent playing Super Mario Bros from structured emulator state.
What the ecosystem tells us
- The interface is the product. Almost every project keeps the "state → typed questions → structured answer" contract and swaps the model. That's a healthy sign the pattern — not one vendor's API — is what's valuable.
- Open replicas are closing fast. A 1B open model doing RLCD-style training means the decision layer may not stay proprietary for long. Watch this space.
- The viral demo was Doom. Structured entity state in, keystrokes out, every frame — the same loop as production gating, just with a game engine. It drove the 1,886-point HN thread for a reason.
For the latest additions, see the news timeline.