Updated Sep 25, 2026

What people are building with Jev

Projects, posts and guides about Jev, the System One model from TypeSafe AI. Each entry links to its source and shows the cost and speed its author reported.

Browse the builds What is Jev?

729builds
156guides
21use cases

4Stars
GitHubOpen source
Jev-Compatible
Make an existing SGLang or vLLM deployment answer as a decision service.
David-Lolly
3Stars
GitHubContext and memory
dsh-jev-prune
Context compaction for DeepSeek Harness, judged by Jev.
yangyu666
1,000 papersVolume
GitHubDocuments and OCR
jev-papers
A thousand arXiv papers, one Jev decision each, checked by an LLM judge.
stas4000
4
3Stars
GitHubAgents and browsers
prompt2jev
Turn a prompt, or the code that runs one, into a Jev decision.
sumleo
~3Stars
GitHubRobotics and devices
OmniJev
Multimodal Jev for robot decision-making.
Iron-LYK
3Stars
GitHubTools and apps
fork-cast
What to eat, decided without any labels, on probabilities.
HaoxiangXia
4Stars
GitHubBenchmarks and evals
Jev-in-the-Loop
Research on which LLM-decision tasks Jev actually speeds up.
Tongyun1
3Stars
GitHubSDKs and integrations
jev_elixir
Jev from Elixir.
Elue
2Stars
GitHubDocuments and OCR
hermes-jev-curator
Typed relation governance and safe archive plans.
anpicasso
2Stars
GitHubBenchmarks and evals
Metask-Jev
Calibrated typed-decision models, one forward pass each.
Metask AI
11Stars
GitHubGames and real time
clash-jev
A Clash Royale bot with no trained policy at all.
bytelabs-oss
GitHubAgents and browsers
ego-jev
One ~0.4 s typed decision per DOM step, instead of an LLM turn.
ZephyrDeng
4~0.4 s
2Stars
GitHubAgents and browsers
dwim
Type what you want, and the right menu item runs in any Mac app.
Rohit Mehta
19Stars
GitHubOpen source
open-jev (browser TypeScript)
Typed decisions in the browser: one state, any number of options.
Nico Martin
19Stars
GitHubOpen source
OpenJev
An open Choice, Noul and Score API on open models.
zhangcy122
13Stars
GitHubAgents and browsers
JevLoop
An agent loop where the decisions cost no LLM call.
zjunlp
9Stars
GitHubOpen source
jevgraph
Knowledge graphs built from typed relation decisions, with the evidence kept.
chenmingtang830
8Stars
GitHubSDKs and integrations
jev-feels
Semantic decisions as ordinary Ruby: feels?, decide, score.
Qew7
5Stars
GitHubOpen source
jevflow
Probabilistic decisions as composable backend primitives.
Mawfyy
GitHubSecurity and abuse
Agent Chaperone
Screen an agent's tool calls with Jev before they run.
agent-chaperone
2
GitHubSDKs and integrations
Jev-CLI
Jev from the command line.
Josh Long
3
<15 msLatency
GitHubOpen source
von
A sub-15 ms local drop-in alternative to Jev.
wfzyx
411
Alex Volkov
@altryne
This is actually insane. This uses @typesafeai Jev model, as a plugin in Claude to review all the un-nesseasary tool calls, and it takes 1s to run! Like, literally, 1 second to take my Claude session from nearly 1M to ... 86K tokens! 😮 Ask your claude to install it and be amazed Use this prompt ``` Install, and configure : https://github.com/tamaratran/fast-jev-compaction ```
GitHubContext and memory
Pick
fast-jev-compaction
Stars
6.2k
Reported
~1M → 86K tokens
18kStars
GitHubUI
json-render
Vercel Labs’ generative UI framework, with a Jev composer behind a flag.
Vercel Labs
1.5kStars
GitHubAgents and browsers
Agent Desktop
Desktop control from the accessibility tree, with Jev picking the operation.
Lahfir
201Stars · ≈ −60% vs largest model backtest
GitHubRouting and model choice
Jev Codex Router
Jev picks the model and the thinking effort for every Codex turn.
Natoshi
57Stars
GitHubCoding and code review
blink
Codebase search by sending a hundred walkers through the file tree.
Ellipsis
33Stars
GitHubSearch
SemDecide
grep for meaning and jq for judgment, with a Unix exit code.
Sharvil Saxena
32Stars · ~0.25 s judgment
GitHubCoding and code review
Canny
A warden that will not let a coding agent finish on a claim.
Qkal
83Stars
GitHubTools and apps
Kill My Idea
Describe a startup idea. Jev says kill it, fix it or ship it.
monteduro
344Stars · every 8 steps decision
GitHubGames and real time
TypeSafe Mario
Jev picks NES controller inputs from telemetry, never from pixels.
fhshaik
20Stars · 60 Hz sim, 20 Hz snapshots server
GitHubGames and real time
1v1 Jev — Quickscope Arena
A browser shooter where the opponent is Jev, first to five kills.
Garrett Emrick
71Stars · 1 call / 2 s pacing
GitHubTrading and markets
Prism Liquidity Agent
An LP rebalancing agent that routes every Jev call through one gate.
Irfandi M
85Stars · 1 request cost per hop
GitHubSearch
neo4jev
Walking a Neo4j graph one hop at a time, each hop a typed choice.
Michael Hunger
23Stars · 24.0 rows/s, one node measured
GitHubDocuments and OCR
jev-curate
A Rust dataset sifter that keeps clean rows verbatim and drops the rest.
Akash Priyadarshi
Akshay 🚀
@akshay_pachaar
GitHubBenchmarks and evals
jev-as-judge
Traces
10 frozen
Questions
4 in one request
SkillRouting and model choice
Pick
hermes-jev-skills
Model routing, memory, compaction and skill selection for Hermes agents.
kerpopule
GitHubAgents and browsers
Jev-cu
A computer-use repository built around Jev.
Sac-Y
GitHubOpen source
awesome-typesafe-jev
A source-backed field guide to TypeSafe’s System One model.
AbdelStark
438
GitHubOpen source
805 verified Jev examples
Examples indexed by the decision each one makes.
kydlikebtc
GitHubOpen source
AppitStudio/awesome-jev
Curated Jev resources and runnable examples for typed decisions.
AppitStudio
GitHubAgents and browsers
Jev Browser
Jev chooses the control, Playwright acts.
openqa-cn
GitHubSDKs and integrations
system-one
A provider-neutral System One runtime for TypeScript and Pi.
iamaamir
GitHubOpen source
system1-agents
Jev, Laya and Cua-S1 as the brain for agents.
ThinkFlowLab
GitHubRouting and model choice
Intent-Router
Typed IntentSpec contracts as the input layer for routers.
angel291592
GitHubOpen source
jev-suite
Four decision-quality tools on Jev, with code keeping the final say.
klauswg
GitHubOpen source
laya-server
A self-hosted API for Laya, compatible with the Jev API format.
1Panel-dev
GitHubOpen source
jevk5
An open-weight alternative to Jev, Apache-2.0.
allebee
GitHubBenchmarks and evals
Jev_Star
A Jev and System One related repository.
sc2musa
GitHubOpen source
jev-tree
A probability tree and graph runtime for verifiable decisions.
Chuf-H
GitHubSearch
laya-jev-GraphRAG
GraphRAG with swappable System One models.
bodepudimuneendra-netizen
GitHubAgents and browsers
Jev agent with top-k logits proposals
A research design for a Jev-native agent system.
6Mikao9
GitHubOpen source
stuntd
A local proxy that answers typed LLM decisions with a Laya head.
bladedevoff
GitHubOpen source
laya-pilot
Replayable Excel test cases from live browser pages.
anthonyli
GitHubOpen source
sys1
A System One compatible API for open decision models, in Rust.
alvarobartt
GitHubOpen source
laya-goish
Laya GGUF inference and an HTTP server in Rust.
cogentica-ai
GitHubOpen source
snap
Typed decisions from unstructured state, with no generated text.
emnlmn
GitHubSDKs and integrations
jev-recipes
80+ TypeScript recipes for agents, retrieval and verification.
agencyenterprise
GitHubOpen source
jevper
A Jev-shaped classification wrapper over OpenAI-like clients.
zhulinchng
GitHubAgents and browsers
Pick
jev-harness
An LLM proposes, Jev answers, code decides, every step leaves a receipt.
TypeSafe AI
GitHubBenchmarks and evals
JevAny
Calibration-aware reinforcement learning for decision systems.
weitianxin
GitHubOpen source
lejudge-jev-jepa
Natural-language constraints for JEPA planning, judged by a decision model.
AbdelStark
GitHubOpen source
laya-candle
A Jev-like Rust port using Laya, fully local and with no Python.
Trystan-SA
GitHubSDKs and integrations
go-jev
A Go SDK and CLI for typed Jev decisions.
mattn
GitHubSDKs and integrations
gut
Elixir control-flow helpers for LLM and Jev judgment.
vinibrsl
GitHubOpen source
A WeChat reply assistant with Jev and DeepSeek
Windows and Apple Silicon builds, with local OCR and human control.
Aimark-dai
GitHubOpen source
Kev
An open-source System One engine with calibrated probabilities.
arjun988
GitHubOpen source
JevHub
A hot list of the Jev ecosystem.
frontierlabai
GitHubDocuments and OCR
JEV-Paper-Radar
Jev reads every new arXiv paper each morning and keeps the few you need.
Eliot5566
GitHubGames and real time
JevTown
A Jev-based AI town simulation.
NevaMind-AI
GitHubBenchmarks and evals
awesome-jev-robustness
Tests, calibration audits and failure-mode studies of Jev.
Yifan-Lan
GitHubAgents and browsers
Learn Jev end to end
A free course: 13 agent use cases with a fast brain and a slow brain.
harshithsunku
GitHubOpen source
laya-fast
An Apple Silicon runtime for Laya: Neural Engine plus GPU router.
DJLougen
GitHubOpen source
awesome-jev-survey
An evidence survey of Jev and Jev-like typed decision models.
Eurekaleo
GitHubOpen source
JevEmbed
Turn embeddings into choices, scores and judgments.
HITsz-TMG
GitHubOpen source
headroom
A local-first brain-budget meter for Codex, scored by Laya.
llm-learner
GitHubAgents and browsers
macos-computer-use-kit
AX-first computer use on macOS with optional Jev semantic guards.
Sur-Cai
GitHubTrading and markets
jev-as-quant
Typed System One decisions as the judgment layer of a quant stack.
jiayylu
GitHubOpen source
open-jev-laya
Browser-only Laya demos powered by Transformers.js.
killkli
GitHubOpen source
laya-apple
A correctness-validated Laya runtime for Apple Silicon.
tc3oliver
GitHubContext and memory
cairn-jev-lab
Test what your AI should remember, with Jev deciding admission.
Cairn-ink
GitHubOpen source
jevelry
Open code for Jev, shown on Hacker News.
phegler
GitHubAgents and browsers
Sniffslop
A browser extension that classifies text with Jev.
a_c
GitHubCoding and code review
Jevopt
Compiler optimisation decisions made with Jev.
ramneet_singh
GitHubSearch
Jev-powered Obsidian search
Search an Obsidian vault with Jev deciding relevance.
MikeLembo
GitHubOpen source
Beating Jev with open models
An attempt to beat Jev’s accuracy, speed and cost with open models.
rob313
GitHubOpen source
laya-coreml
A faster, local Laya-like model for the Mac.
mkagenius
GitHubSEO and GEO
Pick
jev-seo
A live SEO audit for any site, with Jev judging every page.
AgriciDaniel
Omid Sayfun
@OmiidSayfun
Couldn't find my important unread emails, so I built a Chrome extension. Jev finds them and labels them by what they're about. You can check it out here: github.com/iamomiid/jev-i…
GitHubInbox and support
jev-inbox
Daniel Raeder
@DanRaeder
While Jev is down for new invites, I worked with Claude last night to build Vej (a jev clone that runs locally.) It's weakest at score types, but almost 1:1 for noul and choice. You can use it to build and play with jev-based apps until you can get in. github.com/draeder/Vej
GitHubOpen source
Vej
Muskan Paliwal
@PaliwalMuskan19
built this skill-picker for myself because apparently having 30+ agent skills also means remembering which one does what 😭 jev (@typesafeai), being the god that it is, ranks them for a given task and tells me and my agents which skills are actually worth using phew. one less thing for my brain to cache. https://github.com/MuskanPaliwal/skill-picker
GitHubRouting and model choice
skill-picker

Jev GitHub repos

Code you can read, fork and run: jev-ultrafast, OpenJev, nanojev, jevlike, simplejev, jev-trader, jev-mcp and the rest. Each repo calls Jev for a decision — which link to follow, which bucket a ticket goes in, which move to make — and the figures on a card are the ones its author published.

318 builds and 12 guides