User repository on GitHub
- Forks
- 12
- Last pushed
- Updated Sep 2026
Repo stats from the GitHub API, cached Oct 2026.Homepage
CommunityJev Demos & Experiments
Jev — mayank953
Six side-by-side web demos where Jev returns typed probabilistic decisions, plain code owns routing, and a switchable small model writes the words for Claude or Kimi tiers.
- Stars
- 19
- Language
- JavaScript
- License
- MIT
- Published by
- Community
- Author
- mayank953
- Last verified
- Oct 2026
About this project
Six live, side-by-side demos of TypeSafe's Jev — a "System One" model that returns typed, probabilistic decisions (70–500 ms, $0.042 per 1M input tokens, output free) instead of generated text. Jev makes the decision. An LLM writes the words. Your code owns the control flow. Switch the LLM side between Claude (Haiku 4.5 / Sonnet 5 / Opus 5) and Kimi (K2.6 / K3) from the header — every tab, price and pipeline label follows the switch. Open That's it — no build step, no keys required to try it.
Quoted from the project's README. Read the full README.
Works forJev for Classification
Used inJev for Software & DevTools
- Languages
- JavaScript
Highlights
- Covers model routing with confidence escalation, six-question ticket triage, bulk inbox classification, and live title reranking.
- Runs with no keys in badged simulated mode and picks up added keys without restart for most changes.
- Accepts browser-supplied keys per visitor with isolated spend caps, plus hosted mode that ignores server keys.
- Includes guided tour narration, pace control, and clean screenshot view without touching measured latencies.
Watch out
Race lanes show measured API times except the illustrated duel, router scores speed and cost rather than quality, and missing baselines show as unavailable. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
Jev answers typed questions with probabilities while the LLM only writes copy and the app routes on code. Tabs cover routing, triage, inbox scale, slop filtering, title scoring, and cost comparison.
Any tab without its key runs in clearly badged simulated output with a header pill explaining why. Add one Jev key plus one LLM key for a fully live run; providers fail independently.
A hard session budget caps paid LLM spend and falls back to simulated output when reached, the inbox race caps comparison emails while Jev still classifies the full set, and cheap reasoning settings are used throughout.
Hosted mode ignores server keys so visitors must bring their own browser keys, per-key budgets isolate spend, keys are redacted and never stored server-side, and plain HTTP leaves keys unencrypted so use HTTPS.
Clone the repo, run npm install, optionally copy .env.example to .env, then npm start and open http://localhost:3000. Node 22.6 or newer is required because the app runs TypeScript directly through Node's native support, with no build step and no ts-node.
It overlays the normal UI: a narrator bar that captions each step with real numbers, a spotlight highlighting the section being explained, per-tab guide cards, a 'what to notice' callout after each run, and a hands-off guided tour of all six demos. Pace control changes only caption pauses, never measured latencies.
Keys go into this browser's sessionStorage, so they vanish when the tab closes, unless you tick 'Remember on this device' to keep them in localStorage. Each key is checked with a one-token call and gets its own spend cap, and 'Clear keys' removes them.
Other listings of this project
Forks and copies of this project in the directory. This entry is the canonical one.
13GitHub stars
Go Unix CLI that pipes state on stdin into one Jev question — noul, choice, or score — across TypeSafe, Cloudflare, and Vercel providers, printing machine-readable JSON and signaling success by exit code.
Jev Repos & SDKs#community#github
Community
stefafafan/jevGo
stefafafan/jevGo40GitHub stars
Claude Code plugin with jev find, jev ask, and a Read hook that keeps large-file context out of the agent by scoring relevance with Jev.
Jev Agents & MCP#community#jevbest#catalog-import
Community
BorisLeMeec/jevGo
BorisLeMeec/jevGo8GitHub stars
PowerShell module that asks Jev typed yes-no, choice, and score questions from the pipeline, raising named answers as object properties for filtering and selection.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
dfinke/JevPowerShell
dfinke/JevPowerShell136GitHub stars
Unofficial operator companion showing how Jev works as a function call, with an offline lab, smart-home demo, TypeScript harness CLI, and portable agent skills.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
cobusgreyling/JevPython
cobusgreyling/JevPython5GitHub stars
Ruby gem that groups noul, choice, and score questions into one parallel Jev query, exposing a typed result plus raw probabilities.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
virolea/jevRuby
virolea/jevRuby2GitHub stars
Minimal Go client for Jev using only the standard library, with typed Choice, Noul, and Score questions plus local confidence thresholds.
Jev Tools & CLIs#community#github
Community
drpaneas/jevGo
drpaneas/jevGo1GitHub stars
An unofficial Go client that keeps Jev answers in your own types, so a choice over your enum yields that enum and the compiler checks the switch you write on it.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
anilsenay/jevGo
anilsenay/jevGo5GitHub stars
Go client for the TypeSafe System One API and the Jev model. Send one state with named Noul, Choice and Score questions and read back a typed answer, a probability for every option and a confidence. Ships a token-bucket rate limiter, a JavaScript-SDK-style retry policy and a full set of error sentinels.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
kataras/jevGo
kataras/jevGo3GitHub stars
Research notes on Jev plus a Cloudflare Worker demo you can paste a support ticket into. Useful for the failure modes rather than the pitch: no arithmetic, unreliable date comparison, scores that are not measurements, and speed and cost figures from TypeSafe's own evaluations.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
zeke/jevTypeScript
zeke/jevTypeScript1GitHub stars
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.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
haibt163/jevTypeScript
haibt163/jevTypeScript0GitHub stars
Sixty commits of a content site built by a Python pipeline — bilingual content modules, generated OG images, updated news, a serverless API, CI workflows and a DEPLOY.md — under a bare repo name with no description or topics.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
netcode001/jevPython
netcode001/jevPythonMore Jev resources like this
45GitHub stars
Drop-in OpenAI-compatible cache proxy for repeatable agent workflows: exact hits stay local, and with a TypeSafe key Jev judges whether a cached response is semantically reusable for the current request.
Jev Demos & Experiments#community#jevbest#catalog-import
33GitHub stars
Joke JavaScript helper that asks the Jev decision model whether a number is even and resolves to a boolean.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
wobsoriano/is-jevenJavaScript
wobsoriano/is-jevenJavaScript30GitHub stars
Side-by-side game harness where Laya running locally and Jev over API answer the same typed questions for snake, kombat, runner, flappy, tetris, and human-versus-model matches.
Jev Demos & Experiments#community#jevbest#catalog-import
22GitHub stars
Zero-dependency client that turns any logprobs-capable chat endpoint into typed choice, boolean, and score decisions with abstention.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
9pings/notjevJavaScript
9pings/notjevJavaScript24GitHub stars
Native macOS computer-use agent on Apple silicon that finds controls with local CoreML detection, OCR, and accessibility, then asks Jev to pick the next finite-choice action.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
jcpsimmons/jev-macos-loopJavaScript
jcpsimmons/jev-macos-loopJavaScript13GitHub stars
Chrome extension that adds a second Twitch chat column showing only messages Jev rates as matching your chosen intent, with every row linked to its probability distribution.
Jev Demos & Experiments#community#jevbest#catalog-import
From the Jev guides
Original write-ups on what this entry is for.
A game tick is a state plus a legal action list. How Clash Royale, Minecraft, and the earlier Mario, Pokémon, StarCraft, and drone loops ask Jev one step at a time.
Jev Demos & Experiments#gaming#agents#control
Read article
From the Jev community
Posts from builders shipping with Jev right now.