YouUseAI

Learning that's fun,and plenty to discover.

Activities for children from age three read every instruction aloud and teach it the way school does. For you there are 3D games, a photo darkroom, a trip planner and tools for Markdown and JSON.

Open the kids' corner Open an app Why this site exists

Thinking skills: reasoning, coding, the abacus
Sorted by your child's age
3D games, each with an age rating
A reasoning test with answers, timetables, photo editing and developer tools

For kidsMind PlanetsAges 5–10 · 5 planets · 3 age bandsYour child flies to five planets, each training one ability that children's intelligence tests measure: patch a patterned rug and fill the gap in a grid, balance a see-saw, turn tiles to copy a picture and fold a punched paper, remember the order the pals pop up in, and spot every pal that matches. Every round brings new puzzles, in three age bands: 5–6, 6–8 and 8–10. You see where your child is strongest — never an IQ number.Let them play
For kidsMath ExpressAges 6–8 · 3 lines · 90 stationsEvery wagon carries exactly ten crates, so the sum happens in front of your child: adding is the crane loading crates, taking away is lifting them off, and a full wagon locks into a ten. Three lines are three levels — find the result, the middle number, then the first — with thirty stations each. After a second miss the owl counts it out crate by crate and offers one more like it. The clock only records how long the trip took; it never counts down.Let them play
For kidsTimes FortAges 7–10 · 3 grades · 38 stationsPlush monsters march up the hill, each holding a balloon with a number on it; the wall asks 6 × 4, and when your child taps the one carrying 24 the catapult flings a cake that sends it tumbling back down, giggling. Every table is met three ways, the way a class meets it: recited in order, shuffled, then run backwards as division. The three wrong balloons are always the neighbouring facts, so a wrong tap tells you which confusion your child has. Three stars on every station of a floor builds a new piece of the fort.Let them play
For kidsLogic GardenAges 4+ · 3 levels · 8 puzzle typesA machine that only eats one kind of thing: your child feeds it, watches what it chomps and what it spits out, and works out the rule. Higher up: the odd one out, patterns, story order, a grid with a gap — and your child sets a rule for the owl, who gets one wrong for them to fix. Every round brings new puzzles, each with exactly one answer. You see whether they are strongest at sorting, patterns or order.Let them play
AppsMind Gauge6 parts · new questions every time · worked answersAn IQ-style test in six parts — matrices, number series, scales, 3D rotation, a memory span and symbol coding. The questions are new every time, each one comes with its worked answer, and the result is a profile of five abilities rather than an IQ number nobody can back up.Open app
AppsRoute Board10 cities · 115 places · up to 5 daysPlan a trip of up to five days: pick from 115 places across ten Vietnamese cities, get each day ordered with an arrival time for every stop, then take it away as a maps link, a printable sheet or a public link.Open app
GameKinja RunEndless runner · 5 biomesAn endless runner in 3D: pick a dinosaur or a wolf, then jump, slide and dash through five biomes.Play now
DeveloperMarkdown PreviewLive preview · Export HTML/PDFWrite Markdown on the left and watch it render on the right — tables, code, maths, diagrams and more.Open tool

What do you want to do?

For kids18 Apps6 Game14 Developer2

100%

On your machine

Games and apps send nothing out

Ads

No pop-ups, nothing in the way

Products

Games, apps, a kids' corner

To pay

No Pro plan, nothing locked

For kids

Play that teaches them something

From counting and letters to reading, telling the time and the abacus — every activity is spoken aloud and sorted by age.

18 for children

KidsHotLive

Mind Planets

Five planets, five abilities: patterns, number, space, memory and sharp eyes. Puzzles in the style of children's intelligence tests, in three age bands from 5 to 10.

Let them play

KidsHotLive

Math Express

Grade 1–2 adding and taking away on wagons of ten crates: your child sees the sum happen, and sees whether the answer fell short or ran over. Three levels of thirty stations; after a second miss the owl counts it out crate by crate.

Let them play

KidsHotLive

Times Fort

Plush monsters carry numbered balloons up the hill, and tapping the one with the answer fires a cake that sends it rolling back down. Every table is met three ways, like in class, a wrong tap shows you which fact is soft, and three stars on every station of a floor builds a piece of the fort.

Let them play

Visit the kids' corner

Apps

Plan a week, fix a photo or test yourself, in the browser

A timetable for your child, a day-trip route, a follow-along run video, an instrument that plays itself — all worked out on your machine, nothing uploaded.

6 apps

AppHotNew

Mind Gauge

Most IQ test sites hand everyone the same questions and keep the answers to themselves. Here every attempt is a new set, and afterwards you can go through each question with its answer.

Open app

TravelLive

Route Board

Paste a list of places and get the day back in order, with an arrival time for every stop — then take it away as a maps link, a printable sheet or a public link.

Open app

AppNew

My Timetable

The school week runs by period, the after-school week runs by the clock, and no timetable maker draws both. This one draws them on the same A4 page, from stickers a child can place.

Open app

See all apps

Games

Jump in and play a round

3D runners, shooters, puzzles and a sand box that burns and explodes — pick one and you're playing.

14 games

GameHotLive

Beast Run

Thirty beasts, a three-minute run, one massive herd. Pick the right gates to grow it as large as you can, then send the whole stampede into the boss.

Play now

GameHotLive

Kinja Run

An endless runner in 3D — six animated runners, jump and slide past traps while the ground keeps speeding up.

Play now

GameHotLive12+

Toy Box

Drag a toy out of the tray, drop it anywhere and let go — nothing here is driven by hand. The rocket counts down and lifts off, the fire truck finds the road, the T-Rex hunts.

Play now

See all games

Developer

Small tools that do real work

Markdown and JSON, formatted and checked on your machine. Nothing leaves it.

2 tools

Dev toolLive

Markdown Preview

A Markdown editor with a live preview: type, and the rendered document keeps up. Everything runs in your browser.

Open tool

Dev toolLive

JSON Lab

A complete JSON toolkit in the browser: edit, validate, browse, query, convert and compare — your data never leaves your device.

Open tool

See all developer tools

Why it exists

Built to use, not to sell

A good app usually comes with ads, a sign-up wall, or locked features. This site doesn't.

YouUseAI started because that got old. Everything here runs on your machine: open the page and use it, with nothing to install and no account to create.

No investors to pay back, and no Pro plan tucked away somewhere. One person built it, and anyone can use all of it.

See the apps GitHub

What you get

Every game and app here comes with these

They are not one product's features — games, apps and the kids' activities all have them.

Switch devices, keep your progress

Sign in with Google once and your stars and scores follow you to another device. Play on two, and the higher record is the one kept — never the lower.

Your data, yours to see and delete

Your profile shows exactly what the site holds about you: your email and your progress. Download a copy or wipe it, in one press.

Send it to someone as a link

A route, a timetable or a Markdown note can go out as a link. Whoever opens it sees it straight away, no account needed.

Take the result with you

Copy it, download a file, open that file later and carry on. Nothing you make is locked inside the page.

Vietnamese and English

Every screen is in both languages, light and dark. Switch either whenever you like.

It runs on your machine

Games and apps run inside your browser, so the photos, files and work you make stay on your machine.

FAQ

The questions people actually ask

Money, accounts, data, the source code — answered straight.

Do I have to pay?

No. There is no paid tier, no advertising and nothing locked — and nothing here to buy.

Do I have to sign up?

No. Signed out, your progress stays on this device, and switching devices or clearing the browser loses it. Sign in with Google and it follows you; the site keeps your email and your progress, nothing else.

What happens to my data?

Games and apps run in your browser, so what you make stays on your machine. If you sign in, the site keeps your email and your game progress. Your profile lists all of it, and you can delete it yourself at any time.

Is the source code open?

Yes. MIT licence — read, reuse, modify and redistribute it, as long as you keep the copyright notice.

Where do I report a bug or ask for something?

The feedback board on this site. Every note is read; the ones people vote for get built first.

Disclaimer

All tools on YouUseAI are provided free of charge, on an "as-is" and "as-available" basis, without warranties of any kind, express or implied. The person who built this site is not liable for any direct or indirect loss or damage arising from their use. Games are for entertainment only. You use the service at your own risk.

Feedback

Found a bug? Missing something?

This site is built by one person, and every note is read. Tell us what broke, what feels clumsy, or what you wish existed — you will see the status of your note change as it gets handled.

Something is broken
Feature request
Other

Send feedback

Go on, pick one.

Pick anything above and it runs, with nothing to install.

Play a game See the apps