A curated list of tools, integrations, and experiments built on Jev, the System One model from TypeSafe AI that makes fast, typed, confidence-aware decisions.
Jev doesn't write paragraphs. You give it a question and a set of candidates, and it returns a typed answer with a confidence score, in milliseconds and for fractions of a cent. That makes it a good fit for work that needs many small decisions in a loop: picking the next click in a browser or on a phone, routing a task to the right model, classifying documents, scoring code changes, or deciding whether to trade.
No waitlist needed: Jev is available through Vercel AI Gateway as typesafe-ai/jev.
Within each section, projects are sorted by GitHub stars. Counts are refreshed weekly by a workflow. Stars belong to the whole repository, including projects where Jev is one optional integration.
- Official resources
- Frameworks & integrations
- Browser & computer use
- Mobile & robotics
- Coding agents & developer tools
- MCP servers & agent skills
- Observability
- Data, search & classification
- Trading
- Games & fun
- Apps with Jev inside
- Community SDKs
- Open models & replications
- Other lists
- TypeSafe AI - Product site for System One models and Jev.
- Documentation - Guides, SDK references, patterns, and the HTTP API.
- Quick start - From an API key to your first typed decision in Python or JavaScript.
- Primitives - Choice, Score, and Noul, and when to use each.
- Patterns - Confidence-gated routing, composite scoring, speculative fan-out, intent routing.
- TypeSafe Console - API keys and live request inspection.
- Workflow evals - Published workflows, model comparisons, and methodology.
- skills - Official agent skills for designing TypeSafe workflows from Claude Code, Codex, and similar agents. ⭐ 272
- typesafe-sdk-js - Official TypeScript/JavaScript SDK with inferred answer types. ⭐ 129
- system-one-adapter-python - Drop-in
TypeSafeClientreplacement backed by regular LLM APIs, handy for local testing. ⭐ 121 - typesafe-sdk-python - Official sync and async Python SDK. ⭐ 88
- ComposioHQ/composio - Python and TypeScript providers that let Jev select tools and bind supported arguments, with partial-call and abstention results. ⭐ 30.2k
- vercel/ai - AI SDK's TypeSafe provider exposes Jev through the experimental evaluation API for typed Choice, Score, and Boolean questions. ⭐ 26.8k
- 0xPlaygrounds/rig - Rust agent framework with an experimental
rig-typesafeaicrate for typed Jev judgments. ⭐ 8.7k - ax-llm/ax - DSPy-style framework with TypeSafe/Jev support for boolean and class signatures, plus a native client for probabilities and scoring. ⭐ 2.9k
- agentjido/req_llm - Elixir library with typed Jev evaluation through TypeSafe or OpenRouter, retaining probability distributions and provider responses. ⭐ 577
- ash-project/ash_ai - Maps Ash action arguments and return types to Jev evaluation requests through ReqLLM. ⭐ 189
- donvito/ai-backends - API server with a dedicated Jev evaluation endpoint and an interactive playground for typed decisions. ⭐ 145
- trycua/cua - Open-source computer-use platform with cross-OS drivers. Its
jev-useexample lets Jev choose the next action. ⭐ 23.4k - browser-use/jev-ultrafast - Browser agent that uses Jev to pick target elements and only calls a small LLM when it has to type text. ⭐ 5.6k
- awlevin/typesafe-computer-use - macOS computer use for about $0.0002 a step: OCR the screen, let Jev pick the next click. ⭐ 223
- socai-io/socai - Browser and computer-use agent tuned for social media research and content extraction. ⭐ 190
- jkudish/jev-browser - Browser automation driven by Jev. ⭐ 105
- wy-coliney/jev-browser-use - Jev handles the clicks while Codex plans and verifies, for 5-10x faster browser runs. ⭐ 102
- kitze/unclutter - Browser extension that uses Jev to strip page clutter, with reusable template rules. ⭐ 100
- moritzkremb/jev-voice-browser - Voice-controlled browser. Jev resolves intent and target in about 300 ms per spoken word, and Playwright executes. ⭐ 76
- realZachi/typesafe-adblock - Fun Chrome extension that asks Jev "is this element an ad?" and removes it. BYOK, no backend, not a real ad blocker. ⭐ 49
- jcpsimmons/jev-macos-loop - Native macOS GUI automation on Apple silicon: OmniParser CoreML and Apple Vision OCR find the controls, and Jev picks the action. ⭐ 2
- rokbenko/quackd - One CLI for many robots (Open Duck Mini, LeRobot, ToddlerBot, ROS bases). An LLM does the planning and Jev handles the cheaper steps. ⭐ 211
- droidrun/mobile-jev - Agent that drives real Android devices with Jev. Includes live demos, a CLI, and execution traces. ⭐ 139
- RomanSlack/jev-drone - Camera-only autonomous drone in MuJoCo with Jev in the control loop at 2.5 Hz. ⭐ 62
- tamaratran/fast-jev-compaction - Claude Code plugin that replaces compaction summaries with Jev decisions. Each tool call is scored, stale ones are dropped, and the rest stays verbatim. ⭐ 3.3k
- vercel-labs/ai-cli - Terminal CLI whose
ai evaluatecommand asks typed questions about stdin and returns JSON, using Jev through Vercel AI Gateway by default. ⭐ 803 - ksenxx/kiss_ai - Agent framework whose optional Jev task classifier decides whether a request needs development work, with an LLM fallback. ⭐ 552
- notque/vexjoy-agent - Agent toolkit with a Jev-powered
/dcommand for routing requests to agents, skills, and pipelines. ⭐ 420 - WrongStack/WrongStack - Coding agent with opt-in Jev skill suggestions and fleet-dispatch classification through TypeSafe or OpenRouter. ⭐ 328
- thruwire/foreman - Software factory "foreman" built on Jev. ⭐ 299
- SREGym/SREGym - Benchmark for incident-resolution agents with optional Jev review of Codex diagnostic tests and submissions, disabled by default. ⭐ 287
- yonatangross/orchestkit - Claude Code toolkit with opt-in Jev session classification and workflow routing, including shadow modes and fallbacks. ⭐ 278
- devagrawal09/jev-review - Staged code review over git diffs or whole codebases, scoring correctness, safety, reliability, compatibility, and test risk in a local dashboard. ⭐ 269
- monotykamary/pi-fabric - Pi agent runtime with typed Jev judgments and foreground or background decision loops with explicit budgets. ⭐ 234
- gargpratyush/jev-router - Routes each Claude Code or Codex turn: easy tasks go to fast models, hard ones to strong models. ⭐ 140
- NiazMorshed2007/jev-review - Local-first MCP plugin for continuous quality review by AI coding agents. ⭐ 122
- vinilana/jev-eval-agent - Evaluation agent built on Jev. ⭐ 85
- lakeday-org/perch - Semantic code linting with Jev. ⭐ 72
- y0usaf/pi-jev - Jev as a decision layer for the Pi coding agent, with a tool-call gate and typed
jev_ask. ⭐ 67 - DevMortimer/pi-warden - Guardrails for Pi: Jev flags irreversible or off-task tool calls, stuck loops, and unverified "done" claims. ⭐ 64
- 0xNatoshi/jev-codex-router - Per-turn routing for Codex: Jev picks the model, reasoning depth, and speed mode. ⭐ 45
- mrnugget/jev-shell-history - Fish-style zsh history autosuggestions ranked by Jev. ⭐ 44
- IAmUnbounded/save-token-jev-clean - Portable context compaction for coding agents: Jev decides which tool calls still matter, and conversation text stays verbatim. ⭐ 40
- coldteadotai/abide - Makes your coding agent follow your project rules: Jev checks every edit or turn against each rule in AGENTS.md and returns a probability. ⭐ 38
- ellipsis-dev/blink - Codebase search powered by Jev. ⭐ 17
- EliaAlberti/jev-rules - Claude Code plugin where Jev picks which of your rules apply to each prompt, so Claude only sees the relevant ones. ⭐ 9
- morcoan/JevSeek - Local coding workspace: Jev routes actions and DeepSeek generates arguments. Native tools, persistent sessions, React desktop app. ⭐ 2
- valentynkit/jev.nvim - Neovim plugin that asks the buffer a plain-language question, splits it into functions with Treesitter, and ranks Jev's per-function scores in quickfix.
- valentynkit/jev-belay - Claude Code Stop hook that reads the transcript for evidence and, only when files changed with no passing check since, spends one four-question Jev call before letting an unverified "done" stand.
- kitze/skillbox - Self-hosted, versioned skills library for AI agents with optional Jev recommendations. ⭐ 161
- dbreunig/building-with-jev-skill - Agent skill for writing and improving programs that call Jev. ⭐ 104
- jkudish/jev-mcp - Fast, cheap, typed judgments from Jev as MCP tools. ⭐ 73
- itsmostafa/typesafe-mcp - MCP connector that gives any agent direct access to Jev. ⭐ 69
- Dicklesworthstone/skillranker - Rust CLI that ranks agent skills for the next step from live session context. Ships Claude Code hooks. ⭐ 48
- Arize-ai/phoenix - Observability platform with documented Python and TypeScript integrations for tracing TypeSafe System One calls through OpenInference. ⭐ 11.5k
- Arize-ai/openinference - Python and TypeScript instrumentation that records TypeSafe SDK calls as OpenTelemetry spans with inputs, outputs, model, and token usage. ⭐ 1.2k
- robbyczgw-cla/hermes-web-search-plus - Hermes search plugin with optional Jev checks for news intent, extracted-page quality, and language; disabled by default. ⭐ 410
- realZachi/pg-jev - PostgreSQL extension for asking your tables questions in plain language. ⭐ 167
- kyotofin/tax-doc-classifier - Tax document page classifier. Reports 100% strict accuracy on 261 IRS forms at about $0.001 per page. ⭐ 125
- superagents-lab/jev-search - Web search with Jev handling source selection, query understanding, and relevance ranking. ⭐ 115
- giuliosmall/pg_typesafe - Pre-alpha PostgreSQL extension for categorical classification with Jev. ⭐ 76
- pithings/advocaat - Small, type-safe client for asking questions about your data with Jev. ⭐ 74
- trungdq88/youtube-sponsor-detection - Detects YouTube sponsor segments from live audio and transcript. ⭐ 56
- ChetasLua/jevmeter - Scores every sentence of a video with Jev and renders a live meter on a 16:9 edit. ⭐ 56
- jexp/neo4jev - Jev navigates a Neo4j graph by classifying neighbouring relationships. ⭐ 20
- virattt/ai-hedge-fund - Educational investment research and backtesting with a native Jev adapter for investor decisions. The documented workflow does not place real trades. ⭐ 63.5k
- jarrodwatts/jev-trader - One buy/sell decision per Monad block on Kuru MON-USDC. Runs in dry-run/mock mode by default and makes no promise of profit. ⭐ 875
Trading bots can lose money. Read the code and run in dry-run mode first.
- fhshaik/typesafe-mario - Jev agent that plays Super Mario Bros. from structured emulator state. ⭐ 262
- dabit3/jev-experiments - Assorted Jev experiments. ⭐ 226
- standardagents/jevpilot - Playable Three.js driving simulator with a Jev-powered autopilot. ⭐ 72
- valentynkit/jev-plays-pokemon-red - Pokemon Red on PyBoy: code owns the route and the arithmetic, Jev picks only at branches, and every battle turn logs a faint prediction scored by Brier against what the RAM says.
Larger products that use Jev for one part of the job.
- vercel-labs/json-render - Generative UI framework with experimental Jev-based composition from a component catalog. The integration is unreleased and requires a source build. ⭐ 16.5k
- CatCatUncle/openworkbuddy - Local-first AI office agent. Jev checks each acceptance criterion as a yes/no question in goal mode (README in Chinese). ⭐ 159
- MillionSend/millionsend - Open-source email platform on AWS SES. The hosted version scores outbound mail with Jev for content monitoring. ⭐ 159
Unofficial clients for languages the official SDKs don't cover.
- cequence-io/openai-scala-client - Scala client with a native TypeSafe System One module for typed questions and a closed-schema adapter for its OpenAI-style interface. ⭐ 248
- Twister915/typesafe-ai - Rust client with async and blocking backends and observable retries. ⭐ 7
- Tangerg/typesafe-sdk-go - Go SDK. ⭐ 7
- saibimajdi/typesafeai-dotnet-sdk - .NET SDK. ⭐ 5
- joshmn/typesafe-sdk - Ruby client. ⭐ 3
- jonesmelton/verdict - OCaml client built on Eio. ⭐ 0
None of these are the official TypeSafe model. They are independent projects that copy Jev's input/output shape with open weights.
- TheoLeeCJ/SemIf - "Semantic ifs" from open models on a single home GPU (3090). Formerly
openjev. ⭐ 1.6k - vinnylarouge/jevlike - Trains a Jev-like model on your own data to pick one option from a changing candidate set. More an interesting experiment than a practical tool. ⭐ 892
- TianyuCodings/NanoJev - Nano replica of Jev with parallel decisions, dynamic candidates, and an end-to-end training pipeline. ⭐ 385
- NandhaKishorM/laya - Fine-tuned open decision model, benchmarked against Jev's published numbers. ⭐ 242
- ekzhang/openjev-sglang - Jev-compatible, prefill-only API endpoint built on open models with SGLang. ⭐ 157
- jaredpalmer/kev - Tiny Jev-like model on Qwen2.5-0.5B that you can train and run on a MacBook. ⭐ 149
- hr98w/jev-visual - Educational Jev-like visual inference experiment on Apple Silicon. ⭐ 109
- featherless-ai/simple-jev - Turns any open model into a classifier / Jev-style endpoint. ⭐ 65
- kshetrajna12/reflex - Small open decision model on Qwen3.5: state plus typed questions in, calibrated probabilities out. ⭐ 62
- iammrduncan/typesafe-ai-benchmark - LLM gateway that imitates TypeSafe's structured output, for benchmarking against the real thing. ⭐ 32
- Anil-matcha/awesome-jev-by-typesafe - Use cases, patterns, prompts, and starter code. ⭐ 526
- AbdelStark/awesome-typesafe - Official resources and community projects for TypeSafe and System One models. ⭐ 228
- yibie/awesome-jev - Public projects, integrations, and discussions. ⭐ 172
- cobanov/awesome-jev - Source-backed list of projects built with Jev. ⭐ 115
- fatwang2/awesome-jev - Project directory plus a reusable Jev-based GitHub review workflow. ⭐ 114
- AnotiaWang/awesome-jev - Applications, libraries, and resources for Jev and System One. ⭐ 67
Found something good? Open a pull request. See CONTRIBUTING.md.
This list is released under CC0 1.0. This project is not affiliated with TypeSafe AI.