Every Jev guide, in one place
18 guides, grouped by the question each one answers: what Jev is and what a decision costs, how to put it inside an agent, and what people are already using it for. Every one of them is a page on this site, and every figure on them is the one its author published.
Updated 24 Sept 2026 · by Made with Jev
New here? Read Jev explained, then how to use Jev. Everything else on this page answers one narrower question.
What Jev is, what it returns and what it costs
Start here if you have not made a call yet. Shortest first: the plain explanation, the full one, the name for the pattern, the comparison, the price and the data behind all of it.
- Jev explainedThe plain-English version, in three minutes and with no jargon in it.
- What is JevThe full explainer: what a call returns, what it costs, how long it takes and where it fails.
- What is Jev EngineeringThe name for the split: an LLM writes, Jev decides, code acts.
- Jev vs an LLMThe same job done both ways, with the figures each builder published.
- Jev pricing$0.042 per million input tokens, output free, and no free tier.
- Jev statisticsThe Build Report: builds counted, cost per decision, latency and stars, recomputed as the directory grows.
How to build with Jev
From the first call to a harness that runs unattended, then the two questions everyone asks once the bill arrives: can I run it myself, and can I train my own.
- How to use JevYour first call line by line, then the SDKs, the gateways and the video walkthroughs.
- Jev with Claude CodeRouting and compaction inside Claude Code, and where the 200× headline stops.
- Jev MCPThe MCP servers that let an agent ask for a typed judgment while it works.
- Jev agentic harnessThe decision layer: the model proposes, Jev answers, code acts, with a receipt per step.
- Jev orchestrationWho goes next, is this good enough, and when a person has to step in.
- Open-source JevThere are no open weights. These are the models that answer typed questions on your own machine.
- Fine-tune JevYou cannot fine-tune Jev itself. What people train instead, and what each run cost them.
What people use Jev for, by job
The same builds the feed carries, read by who you are rather than by what the decision is. Every figure on these pages is the one its author published.
- Jev use casesEvery catalogued build, grouped by the job Jev does inside it.
- Jev as a judgeJev in place of an LLM judge: evals, rubrics, and what the confidence score is not.
- Jev for SEOAudits, GEO and slop checks at a per-page cost that makes them routine.
- Jev for adsCompetitor libraries read in full, and creative pretested before the spend.
- Jev for marketingResearch, testing, publishing, demand and analysis, with the published cost of each.
Jev builds, repos and videos, by format
The guides above are ours. These are the lists underneath them: 685 catalogued builds and 156 other people’s guides, docs and talks, filtered by the form they take.
- All buildsThe full feed: every build, guide and post, newest first.
- Jev Engineering reading listEvery guide, talk and build that shaped Jev Engineering, in reading order: the LangChain harness guide, TypeSafe’s founder talks, jev-ultrafast and instant compaction.
- Jev GitHub reposjev-ultrafast, OpenJev, nanojev, jevlike, simplejev, jev-trader and every other repo that calls Jev. Each one linked, with the figures its author published.
- Jev agent skillsAgent skills that build with Jev or hand it the agent’s small decisions. Install TypeSafe’s own with npx skills add typesafe-ai/skills.
- Jev demos and threads on XWatch the Jev demos posted on X without leaving the page. Every card plays the video from the original thread, from browser agents to Doom.
- Jev tutorials and demosEvery Jev tutorial, walkthrough, interview and demo worth watching, collected and playable on this page. Start with the one that matches what you want to build.
- Jev apps you can tryWorking Jev apps, open in one click, no install and no API key. Each one sends Jev a question and shows you the typed answer that comes back.
- Jev docs and cookbooksTypeSafe’s quickstart and docs, the LangChain harness guide, the awesome-jev lists and the launch coverage. What to read before your first Jev call.
Jev use cases, all 21 of them
The same builds again, split by what the decision is for. For the version grouped by the job Jev does rather than by taxonomy, read Jev use cases.
- Agents and browsers163
- Context and memory31
- Coding and code review38
- Routing and model choice49
- SDKs and integrations119
- Open source120
- Benchmarks and evals130
- Search35
- Documents and OCR28
- Security and abuse29
- Inbox and support23
- Social feeds49
- Ads and marketing22
- Sales and leads13
- SEO and GEO10
- Ecommerce7
- Games and real time72
- Trading and markets20
- Robotics and devices14
- UI13
- Tools and apps49
Jev tools you can use here
Not reading: things that run. The tools board lists what other people ship, and one free tool runs on this site, on Jev, with no key of your own.
Made with Jev is independent and not affiliated with TypeSafe AI. Something missing? Submit a build.