Help & questions

Yes - that's what they're built for. Every line is spoken aloud and shown as a caption, and children tap big pictures instead of typing. Sit with them for the first lab; after that most 5- and 6-year-olds explore happily with a grown-up nearby.

Any modern web browser: iPad and iPhone (Safari), Android tablets, Chromebooks, Windows and Mac. Open k5stem.com/play/kindergarten - there's nothing to install and no account to make. Turn the sound on: the labs are narrated. On Chromebooks, Windows and Mac you can also install the free Chrome extension, which works offline.

About 10 to 15 minutes. Each one is a short investigation - wonder, guess, test, think - followed by a small challenge, a badge and a printable lab record. Children can stop and start again any time.

Each lab targets one of the 8 NGSS* Kindergarten performance expectations - together they cover the whole Kindergarten year. Every lab page names its standard, the science practice it uses, and links to the official text.

It's a simulation built to behave like the real thing: a harder push really rolls farther, water really warms more slowly than sand, a plant kept in the dark really grows tall, thin and pale. The science is simplified so the main idea stands out, and every lab suggests a real hands-on activity to try afterwards.

Push the Ball! is free - no sign-up. The other 7 labs unlock with one payment: Family $19 (one household, up to 5 devices) or Classroom & Co-op $49 (one class or group, up to 30 devices). No subscription, and updates to the labs are included.

Your license key is on Gumroad's receipt screen and in the receipt email. Paste it on the Unlock page of this site (or in the labs: Grown-ups → Unlock). All 8 labs open on that device straight away.

Each browser where you enter the key - for example Safari on your iPad and Chrome on your laptop count as two. Clearing the browser's data uses a new slot when you enter the key again; if you run out, reply to your Gumroad receipt email and we'll reset it.

Yes, the same key unlocks the free Kindergarten Science Labs extension for Chrome and Edge. Open it, tap Grown-ups, answer the grown-ups question, open Unlock and paste the key. The extension counts as one of your plan's devices.

Yes. The Classroom & Co-op plan covers one class, co-op or tutoring group on up to 30 devices. Labs work well on a classroom screen for a whole-class launch and on tablets for centers. See the page for teachers.

Ask within 30 days of buying for a full refund - just reply to your Gumroad receipt email.

Gumroad, a payment platform for independent creators. It's the merchant of record: it takes the card or PayPal payment, adds sales tax or VAT where it applies, and emails your receipt. We never see your card details.

No. There are no accounts, no ads and no tracking. Badges stay in the browser on your device. The only thing ever sent anywhere is your license key, to Gumroad, to check the purchase - and only after a grown-up agrees.

Tap the big Play button to start a lab - browsers only play sound after a tap. Check the speaker button in the lab's top bar, the device volume, and on an iPhone or iPad the silent switch or Focus mode.

That lab isn't unlocked on this device yet. Enter your license key on the Unlock page, or buy a plan. If you unlocked it before, the browser's data may have been cleared - enter the key again.

The website needs an internet connection. For offline use, install the free Kindergarten Science Labs extension for Chrome or Edge from the Chrome Web Store. All the labs are inside it, so once it's unlocked it works without a connection.

They're in the works - one lab for every NGSS* performance expectation from Grade 1 to Grade 5. The lab map shows what's planned. Follow K5 STEM on Gumroad to hear when a new grade is ready.