User repository on GitHub
Jev Playground 2.0
- Forks
- 0
- Last pushed
- Updated Sep 2026
Repo stats from the GitHub API, cached Oct 2026.Homepage
A reference app for Jev's typed primitives: three use cases — support routing, compare-and-choose and content triage — behind one server-side SDK boundary, with a developer view of every question, threshold and token count.
User repository on GitHub
Jev Playground 2.0
Repo stats from the GitHub API, cached Oct 2026.Homepage
This is one of several Jev listings for the same project. The canonical entry is Jev — mayank953.
A TypeSafe System One playground: give Jev a messy real-world input and it turns it into fast, typed judgments that application code can use. Jev is TypeSafe's flagship System One model. It answers narrow, typed questions — Choice, Score, and Noul — with calibrated probabilities. It does not generate prose and it does not decide workflows. This playground demonstrates the division of labor: Jev judges; this application decides.
Quoted from the project's README. Read the full README.
Watch out
It is a demo instrument with no database, keeping nothing beyond session statistics in sessionStorage. Jev evaluates text only, its primary training language is English so other languages score lower, and the probabilities are calibrated across prediction groups rather than guaranteed for any single answer. Thresholds are the application's own values, so what looks like a model setting in the UI is code in rules.ts. The API key is read server-side at call time and never reaches the browser, but every use case still makes live hosted calls; only the test suite runs without credentials, against a mocked answer boundary. A few forwarder shims under src/lib/jev and src/components are marked do not import and left for a follow-up cleanup. Copy reviewed against the repository README on 2026-10-04, not from running it.
Original write-ups on what this entry is for.
Posts from builders shipping with Jev right now.