Six browser demos of Jev's three primitives, each running the same judgment past Gemini or Claude for a side-by-side, with visitors pasting their own keys into localStorage instead of sharing a server-side key.
User repository on GitHub
Next.js UI showing off TypeSafe's System One model (Jev) — parallel Noul judgments and a Choice-based citation checker, deployable to Vercel
Repo stats from the GitHub API, cached Oct 2026.Homepage
Six live demos of TypeSafe's System One model (Jev) — each pairing a real interaction with a real judgment, and each one checkable against Gemini or Claude in the open.
Quoted from the project's README. Read the full README.
Watch out
Nothing runs without the visitor pasting a key, so you cannot read the demos without a TypeSafe account and an OpenAI or Anthropic account for the side-by-side. Although the calls execute server-side, the key travels from the browser into each Server Action as a parameter and is only kept in localStorage client-side. The comparison strip costs real money: every demo also calls Gemini or Claude with the visitor's second key at that provider's published per-token rates, and the result is never used for what the demo itself does. The tone rubric is the one route where the models genuinely diverge, so its numbers describe a disagreement as much as a quality gap. Copy reviewed against the repository README on 2026-10-04, not from running it.
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matthewp/flue-jev-demoTypeScriptOriginal write-ups on what this entry is for.
Posts from builders shipping with Jev right now.
