Use it in class tomorrow.

No sign-ups, no names, no ads.

CurioXL is 160 free science lessons for ages 6 to 18, in chemistry, physics, biology and earth & space. Every lesson is written at four reading levels, so a whole class learns the same science, each at the level that fits.

How it works in class

1. Each learner opens curioxl.com/start on any device, or a lesson link you share.
2. They choose their age group and get a made-up nickname. No name, email or account, ever.
3. They read at their level, answer questions as they go, and finish with a short quiz. Chemistry and physics lessons include an experiment to run on screen. Progress is kept on the device they used.

What learners never see

No ads, no chat, no messages from strangers, and no leaderboards. Nothing on CurioXL loads from other websites.

Pick a lesson

• Physics
• Chemistry
• Biology
• Earth & Space

For your whole school

CurioXL for Schools works with ClassLink: classes arrive already set up, you send the check-ins, and you see how each class is doing. Ask your school or district about it.

Start free