Follow a good question.
Why does an octopus change color? Meet a remarkable animal and learn an idea you can explain in your own words.
Small adventures. Big questions.A little wonder
A little wonder
goes a long way.
Meet Nautilus, your child's curious ocean guide. Discover something surprising, solve a little puzzle, and create a story worth telling at dinner.
Math, letters & ocean adventures · Ages 3–12 · No sign-up needed
EXPEDITION 001 / THE CURIOUS REEF
“Ready to find out how an octopus hides?”NAUTILUS · YOUR NEXT ADVENTURE AWAITS
Free math & alphabet gamesNo ads in this experienceThree age levelsEnds with an offline activity
New / The little discovery clubA sea of numbers.
A sea of numbers.
A world of letters.
Count shells, meet the whole alphabet, build little words, and spot a pattern. Four playful activities with three friendly levels.
Pick a game & play free ↗What will you discover today?
- Math reef — count, add & multiply
- Alphabet garden — all 26 letters
- Letter detective & word builder
- Pattern lagoon — what comes next?
No timer. Gentle hints. No account or payment required.
01 / A good place to begin
Ask. Create. Explore.
A small, complete adventure. One idea to understand and a little room to make it your own.
Think a little deeper.
Try an age-adjusted counting puzzle. Get a gentle hint, take another look, and work it out at your own pace.
Make the story yours.
Choose a character and a destination. Finish with a drawing or an adventure you can act out away from the screen.
Room for every
little explorer.
Choose an age band. No birthday, name, or personal details needed for the guest adventure.
Ages 3–5
Simple words, a small counting puzzle, and choices to make together with a grown-up.
Ages 6–8
A new science word, a little addition, and an imaginative story to tell back.
Ages 9–12
More explanation, a multiplication puzzle, and a chance to ask what might happen next.
02 / For the grown-upsMore “look what I learned.”
More “look what I learned.”
Less guessing.
See the ideas your child explored and pick a conversation to continue together. The sample dashboard is clearly marked. Signed-in activity is shown separately.
- Actual activity, with clear empty states
- A printable learning summary
- Plain-language information about data and AI
Illustrative sample · Not a child's recordA small discovery,
A small discovery,
a bigger conversation.
THE CURIOUS REEF
Explored
Animal camouflage & counting
Created
An octopus adventure in the kelp forest
Ask together: “Where else have you seen something blend into its surroundings?”
03 / Clear from the startStart for free.
Start for free.
Grow your curiosity.
A free first adventure. A simple Family plan for more questions and stories.
Free learning
$0 always free
Math, alphabet, word and pattern games, plus the Curious Reef adventure. No account or card needed.
- Math, A–Z letters, words, and patterns
- Science and story choices in the ocean adventure
- Three age levels: 3–5, 6–8, and 9–12
- Offline activity and printable recap
- Optional recap saved on this device
Written activities. These free games do not use an AI service.
Family
$6.99 / month
$6.99 billed every month. Renews monthly.
- AI questions and answers in the chat beta
- AI story creation and creative prompts
- Saved learning activity across devices
- One parent account and one child profile
- Parent-managed subscription and invoices
USD. Applicable tax, if any, is shown before payment. Cancel before renewal to stop the next charge.
Family is coming soon. The guest adventure is free today.
Compare plans & read billing details →Before we dive in.
Can we try it without creating an account?
Yes. The guided adventure asks only for an age band. Your choices stay in the current page unless a grown-up chooses to save the recap on this device.
Is the guest adventure powered by AI?
No. It uses written educational content and a story assembled from your choices. The separate signed-in chat app can use AI when the server service is available.
Where does our information go?
Guest adventure choices are not sent to an AI service or account database. Signed-in profiles and chat history are stored through Supabase, and AI chat text is processed through the server and AI provider. Read the privacy information.
Does it work on a phone?
The adventure works in a browser on a phone, tablet, or computer. No microphone is required. Optional read-aloud uses your browser's speech feature when available.
Does Nautilus monitor my child's wellbeing?
No. Automated chat flags can miss things or misread context. They are not a diagnosis, monitoring service, or substitute for a trusted adult. Read the safety notes.