Read & learn
Written guides.
Understand Jev, one idea at a time. Walkthroughs, recipes, and writeups — our notes first, the original next.
A public registry · independent & community-run
Explore the Jev ecosystem.
Learn, build, and play with Jev — from deep technical guides to creative experiments.
Watch & learn
Video guides.
See an idea take shape. Tutorials, demos, and deep dives, organized by topic and credited to their creators.
Make & explore
Experiments.
See what builders made with Jev. Games, tools, repositories, articles, and more — traced to their sources.
The directory03 / 03 · Experiments
Find something worth exploring.
Every category, from games and tools to repositories and writeups, traced to a primary source.
Same ideas.
Different paths.
This is the full registry, not just the featured picks. Figures like speed, cost, and stars are maker-reported or captured snapshots, not JevMade measurements.
1613 experiments · showing 1021–1080
Fly the same seeded cargo-drone corridor as a human pilot, a geometric baseline, and Jev.
SOURCE SCREENSHOTEXPAND ↗
A browser bird asks Jev whether to flap once, twice, or not at all as each pipe approaches.
SOURCE SCREENSHOTEXPAND ↗
A town simulation with twelve residents, each limited to their own view of the world.
SOURCE SCREENSHOTEXPAND ↗
Who would win in a fight? Jev judges an animal tournament on land, in water and in the air.
SOURCE SCREENSHOTEXPAND ↗
Play a complete browser chess game against Jev and inspect how it distributes confidence across legal moves.
SOURCE SCREENSHOTEXPAND ↗
Describe a portrait one letter at a time and watch Jev reshape a suspect lineup—or question a hidden suspect directly.
SOURCE SCREENSHOTEXPAND ↗
Watch Jev steer Snake toward food and power-ups while live meters reveal its intent, safety calls, and trap risk.
ACTUAL RECORDING12 SEC ↗
Play chess against Jev in pygame, or give it both colours and watch a fully automated match.
SOURCE SCREENSHOTEXPAND ↗
Follow a Jev-guided ROS 2 turtlesim route from an early control failure to a corrected four-waypoint run.
SOURCE SCREENSHOTEXPAND ↗
Compare Jev's driving choices when its road description comes from perfect simulator state or a vision model.
SOURCE SCREENSHOTEXPAND ↗
Play animated chess against configurable Jev strategies, or pause a Jev-versus-Jev match to inspect a decision.
SOURCE SCREENSHOTEXPAND ↗
Replay a documented Jev-versus-Stockfish tournament with legal moves, raw responses, complete games, and provisional ratings.
SOURCE SCREENSHOTEXPAND ↗
Send a Three.js spaceship on mining and combat missions while Jev selects targets and gauges danger.
SOURCE SCREENSHOTEXPAND ↗
Build a persistent 3D town where Jev can shape resident intentions and broad regional policies.
SOURCE SCREENSHOTEXPAND ↗
Watch Jev decide whether Snake should turn left, turn right or keep going.
ACTUAL RECORDING12 SEC ↗
Solve four-part harmony quizzes, then switch to an endless Rhodes piano whose chords are chosen by Jev.
SOURCE SCREENSHOTEXPAND ↗
Scroll X as Jev washes each tweet in a watercolor gradient mixed from thirteen palette colors.
SOURCE SCREENSHOTEXPAND ↗
A Snake experiment where Jev suggests moves and a safety check can reject them.
ACTUAL RECORDING12 SEC ↗
Read or autoplay an illustrated gamebook while Jev chooses among the exploration and combat actions currently available.
SOURCE SCREENSHOTEXPAND ↗
Watch live or recorded Jev turns across six browser games, including 2048, Snake, and a raycaster shooter.
SOURCE SCREENSHOTEXPAND ↗
Watch up to six personality-driven fighters battle, or enter the arena yourself while Jev controls the other combatants.
SOURCE SCREENSHOTEXPAND ↗
Jev helps the residents of a small simulated town decide how to spend their days.
SOURCE SCREENSHOTEXPAND ↗
Play Xiangqi against Jev and inspect score bars for its strongest legal moves.
SOURCE SCREENSHOTEXPAND ↗
A Flappy Bird test that grades Jev's decisions and lets you replay the results.
SOURCE SCREENSHOTEXPAND ↗
A wraparound snake keeps moving on a fixed clock while Jev periodically chooses to continue or turn.
SOURCE SCREENSHOTEXPAND ↗
Solve Japanese lateral-thinking mysteries by asking questions that Jev judges against a hidden truth.
SOURCE SCREENSHOTEXPAND ↗
A text adventure that uses Jev to understand commands you write in your own words.
SOURCE SCREENSHOTEXPAND ↗
Play four-seat Texas Hold'em while comparing Jev's betting judgments with a rules coach and Monte Carlo equity estimate.
SOURCE SCREENSHOTEXPAND ↗
Challenge Jev at 15×15 Gomoku after a tactical search narrows each turn to four promising moves.
SOURCE SCREENSHOTEXPAND ↗
A point-cloud rigid-body simulator asks Jev to classify possible collisions after conventional broad-phase filtering.
SOURCE SCREENSHOTEXPAND ↗
Uncover a hidden word with yes-or-no questions while Jev judges ambiguity and attempted cheating.
SOURCE SCREENSHOTEXPAND ↗
Watch Jev navigate FrozenLake with a full map or tackle MiniGrid DoorKey through a limited field of view.
SOURCE SCREENSHOTEXPAND ↗
Analyze a message's tone or watch Jev choose its way through a generated 15-by-15 maze.
SOURCE SCREENSHOTEXPAND ↗
Watch a browser snake follow short, code-generated routes selected by Jev.
SOURCE SCREENSHOTEXPAND ↗
Study Jev's decision concepts in Japanese, then test them in a short game about spotting a disguised delivery unit.
SOURCE SCREENSHOTEXPAND ↗
Play terminal Sudoku yourself or watch Jev choose cell-and-digit moves while the benchmark tracks whether it solves the grid.
SOURCE SCREENSHOTEXPAND ↗
A browser Snake game autoplays while Jev chooses each direction from the moves currently available.
SOURCE SCREENSHOTEXPAND ↗
Choose a musical scale and hear a browser synth continue the melody with Jev-selected notes and rests.
SOURCE SCREENSHOTEXPAND ↗
Compare Jev with a conventional language model on route planning, Minesweeper, Hanoi, and a simulated drone.
SOURCE SCREENSHOTEXPAND ↗
Jev picks strategic preferences while a traditional engine searches for moves on a chess.com board.
SOURCE SCREENSHOTEXPAND ↗
Play browser tic-tac-toe against Jev, which chooses its turn from the squares still available.
SOURCE SCREENSHOTEXPAND ↗
Paste a story or find one on Wikipedia, then chart three characters’ action intensity and feelings across the plot.
SOURCE SCREENSHOTEXPAND ↗
Experiment with pixel art by asking Jev to map simple silhouettes or judge generations of code-made sprites.
SOURCE SCREENSHOTEXPAND ↗
Search and browse a persistent fictional web whose generated pages are assembled under Jev’s direction.
SOURCE SCREENSHOTEXPAND ↗
Turn a document into a sentence-by-sentence heat map of requirements, tension, rhetorical role, or other chosen dimensions.
SOURCE SCREENSHOTEXPAND ↗
Direct a music-video pipeline in which Jev chooses camera, composition, lighting, and tone before other tools generate each cut.
SOURCE SCREENSHOTEXPAND ↗
Let Jev choose one legal land action for an OpenFront bot based on the current border situation.
SOURCE SCREENSHOTEXPAND ↗
Watch Jev play both sides of chess, then replay each move’s probability distribution beside Stockfish’s grade.
SOURCE SCREENSHOTEXPAND ↗
Compare ways of showing Jev candidate moves in a head-to-head arena for two falling-block games.
SOURCE SCREENSHOTEXPAND ↗
Play tic-tac-toe while Jev chooses its move from the cells that remain empty.
SOURCE SCREENSHOTEXPAND ↗
Compare Jev’s Battleship shots with random, hunt-and-target, and placement-density strategies on seeded games.
SOURCE SCREENSHOTEXPAND ↗
Compare 21 ways of describing legal SameGame moves to Jev, with every raw request and response preserved.
SOURCE SCREENSHOTEXPAND ↗
Pit Jev against random and hand-tuned players in Tetris, Snake, and 2048 while logging confidence for every move.
SOURCE SCREENSHOTEXPAND ↗
Triage simulated warehouse-robot incidents with Jev and compare its decisions with a small local classifier.
SOURCE SCREENSHOTEXPAND ↗
Decode an ad’s persuasion pattern, then rank template-built rewrites against a synthetic focus-group rubric.
SOURCE SCREENSHOTEXPAND ↗
Point an agent at a macOS canvas of live pages and let Jev resolve described elements or steer a short browser goal.
SOURCE SCREENSHOTEXPAND ↗
Compare Jev with general language-model judges on one multilingual booking-inquiry routing task.
SOURCE SCREENSHOTEXPAND ↗
Load books, PDFs, Word files or images on Windows or Android and ask bounded questions with answers expressed as probabilities.
SOURCE SCREENSHOTEXPAND ↗
Run a persona-driven website journey and record where the simulated visitor becomes confused, stuck, or lost.
SOURCE SCREENSHOTEXPAND ↗
Find code that deserves a closer look by asking Jev to rank possible design problems.
SOURCE SCREENSHOTEXPAND ↗
Jev, briefly
A decision model, not a chatbot.
A chat model generates text token by token and hopes you parse it. Jev never generates a word. Your code sends the state of the world plus typed questions; Jev returns every answer in one parallel pass — typed values with calibrated probabilities and a confidence score your code can trust. About 70–500 ms end to end, $0.042 per million input tokens, output free. Trained with what TypeSafe calls Reinforcement Learning for Calibrated Decisions.
choice Pick one of these.
You define the options. Jev returns the chosen option, a probability for every option, and a confidence. The workhorse of routing, agents, and games — the answer space is always legal, so there is nothing to parse and nothing to hallucinate.
score Rate this on a rubric.
You describe ordered levels — say trivial / normal / critical. Jev returns the level, the probability of each, and a confidence. Scores turn fuzzy judgment (“how severe is this log line?”) into a number-free decision your code can branch on.
noul Is this statement true?
You assert a statement; Jev returns the probability that it is true — a noul. Moderation, verification, guardrails, “does this diff actually fix the bug?”: one question, one calibrated probability.
Official material lives at typesafe.ai and docs.typesafe.ai. JevMade is an independent community registry — not affiliated with or endorsed by TypeSafe AI.
Recurring lessons
Patterns that keep showing up.
One decision per tick
Games, drones, trading bots, and browser agents all converge on the same loop: serialize the state, ask one decisive question, act, repeat. Jev’s latency makes the loop feel instant — the model lives inside the control loop, not outside it.
Confidence as a gate
The answer says what; the confidence says whether to act. The most reliable entries threshold on confidence to route edge cases to a slower model or a human — automation with an honest escape hatch.
Shrink the choice space in code
Makers rarely ask Jev to pick from everything. Local tactics prune 225 gomoku moves to ~40; DOM filters turn a page into an element table; code narrows options, Jev judges within them.
Jev judges, LLMs talk
A recurring split: Jev makes every decision cheaply and instantly, and a small LLM is only invoked when a human-facing string must actually be written. Decision and generation are separate budgets.
Made something with Jev?
Send the link — repo, live demo, post, or video — plus a line on what it does and which primitives it uses. Every entry is verified against its primary source before it ships.
Submit your experiment → hello@JevMade.com