Cosmosono
The logic puzzle you can hear – for young and old.
Hear the signal, find the planets that send it – and every solution becomes music.
For iPhone and iPad
- No ads
- No tracking
- No account
How it works
Seismo, a little alien, has crash-landed next to Professor Halley’s radio station. To find his way home he has to learn to read the signals of distant solar systems – and you help him.
Every planet sends in its own rhythm: the one on orbit 2 on every second beat, the one on orbit 3 on every third, the one on orbit 4 on every fourth. In the signal you see and hear them all at once. Your job: find out which planets are sending.
Every signal has exactly one solution, and reasoning is enough – you never have to guess. When your choice fits on every beat, the signal is decoded, and the planets play it as a melody.
For the whole family
A game that grows with you: easy enough for children who are just learning to count in time, and tricky enough for grown-ups who want to puzzle away a Sunday.
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Learning to count as you play
Which planet sends on 3, 6, 9 and 12? Anyone just learning to count discovers divisors and multiples through play, learns to puzzle things out and gets a feel for rhythm. The “Radio pals” have very easy signals to get started, and part 1 is free.
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A real puzzle for grown-ups
Shifted planets, echoes of moons, nebulae, duets and several suns: every signal has exactly one solution and can be cracked without guessing. On Sundays it gets really hard.
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Music to feel
Every planet has its note, every solution becomes a little melody in three-four time. With headphones, silently by eye or on iPhone as vibration.
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Playing together
The daily signal is the same for everyone. Compare your stars in the evening – and share your result without giving away the solution. With Plus the whole family plays through Family Sharing.
What you’ll find in the app
At first only the journey and Zen are open – so it stays calm. After the radio school the other places open, and Halley shows them to you in a short tour.
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Journey
After the radio school, at least 15 chapters tell Seismo’s story, each with a new idea. Along the way there are detours to a black hole.
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Today
A new signal every day, the same for everyone – easy on Mondays, hard on Sundays. With Plus you also get your own puzzle that grows with you.
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Your solar system
Suns, worlds and glows you collect with stars: choose the orbit and speed of every planet, orbit shades and distant galaxies – or roll the dice for a suggestion.
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Zen
No clock, no story: endless signals to listen to, a melody to fall asleep to and calm breathing in the rhythm of your system. Your stars bring new star systems, up to 48.
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Diary
Your days at the receiver: streak, awards, every signal you solved and your daily melody of the last four weeks.
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Radio pals
Very easy signals to get started, for beginners of any age. Part 1 with 12 signals is free, part 2 with 16 more comes with Plus. Before the Plus page or a link opens here, the app asks a small question for grown-ups.
The journey: radio school and at least 15 chapters
First, radio school teaches you the rules, then every chapter brings a new idea. From day one, the first five chapters are available. After that, the radio window to Seismo’s home opens regularly, and a new chapter arrives – Seismo’s journey is made to be enjoyed, not rushed.
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Before the journey
Radio school Free
In a few minutes Halley shows how planets send and how to read their signal.
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Morning star Free
The first real signals: which planets are inside?
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Phases Free
Not every planet starts on beat one – some are shifted.
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Constellation Free
Up to five shifted planets at once.
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Duet Plus
Two systems with two tempos share one signal.
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Nebula Plus
Some beats are hidden – you work it out from what you hear.
At least 10 more chapters Plus
Ten arrive one by one through the radio window, each with a new idea – all the way to the finale. Seasons add chapters of their own, the first one in winter. What happens there is yours to discover. “Winter at Halley’s” is open until 31 January 2027. The first chapter is free. Seasons are open for a limited time only. Your stars and rewards stay.
Detours to the black hole
After chapters 3, 7, 11 and 15 a black hole calls: 12 missions with the gravitational lens, which makes every pulse arrive a second time – later against the clock, before the system is swallowed.
Zen: time to wind down
Three ways to switch off – each with a timer, even with the screen locked. Listening, falling asleep (up to 20 minutes) and breathing are free. Your Zen library grows as you play: stars and rewards bring new star systems, up to 48. Cosmosono Plus adds your solar system as music, a playlist, mixed nature sounds, a long timer and a gentle alarm.
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Listen
One signal after another plays by itself, with no clock and no stars. You just listen.
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Fall asleep
The music slowly calms down to a gentle slumber tempo and fades out softly in the last minutes – with nature sounds if you like.
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Breathe
A glowing circle breathes with you: relaxed (4 in, 6 out), for sleep (4 – 7 – 8) or as a box (4 – 4 – 4 – 4).
Drag to turn
Your own solar system
With every star your own solar system grows: new suns like a pulsar, a red giant or a white dwarf, worlds of lava, water and ice, plus comets, polar lights and a star nebula. Suns and worlds are based on something real in the sky.
Your sun then shines in every signal and on your Home Screen.
iPhone and iPad
Cosmosono is made for iPhone and iPad. Apple Watch and Mac are coming soon. Your progress and your solar system stay in sync between your devices through your own iCloud – for everyone, even without Plus, with no account and no server of ours.
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iPhone
Play wherever you are: the journey with Seismo, the daily signal and Zen to fall asleep. On iPhone, you also feel every pulse as a gentle vibration. Widgets show your solar system on the Home Screen and your streak on the Lock Screen, and Zen shows the time left as a Live Activity.
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iPad
Plenty of room for signals: in landscape, your planetary system and the signal sit side by side, and a sidebar takes you to Journey, Today, Solar system, Zen and Diary. Zen has a calm view with big buttons, nice for the bedside table. There are Home Screen widgets here too.
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Apple Watch Coming soon
Cosmosono is coming to Apple Watch soon: your solar system on your wrist and calm breathing with gentle taps.
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Mac Coming soon
Cosmosono is coming to Mac soon, with the same progress through your iCloud.
Accessibility
We want as many people as possible to be able to play Cosmosono. This is what the app can do today:
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Playable without sound
Every signal can also be solved silently, by eye. The app always starts muted, and on iPhone you can feel every pulse as a vibration if you like.
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Shapes, not just color
Shapes show whether a sum is right: ▲ means too many pulses, ▼ too few, and a dot means it matches. The shapes grow with the text size.
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Large text
Text pages such as Settings, the diary, the guide and the Plus page grow with the system text size, to more than 200%. On the board the text grows a little less, so everything fits on the screen.
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Reduced motion
With “Reduce Motion” turned on, Cosmosono moves more calmly: fewer animations, no shaking or flying.
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Light or dark
Light, dark or like the system: the dark look is easy on the eyes, even in bed at night.
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VoiceOver
Buttons and controls are labeled for VoiceOver. We keep working to make every signal solvable without looking.
Free and Plus
You can play Cosmosono for free – with no ads. Cosmosono Plus unlocks everything.
Free
forever
- the radio school
- chapters 1–3 and the first signal of chapter 4
- “Radio pals” (part 1)
- the daily signal
- the first chapter of every season
- Zen for listening, falling asleep (up to 20 minutes) and breathing, with a library that grows with your stars
Cosmosono Plus
monthly, yearly (with a 1-week free trial) or as a one-time purchase that’s yours forever
- the whole journey to the finale, with new signals arriving regularly
- “Radio pals” part 2 and every chapter of each season while it runs
- your own puzzle every day
- Sunday and special-day puzzles, the archive
- all of Zen: your solar system as music, playlist, mixed nature sounds, long timer, gentle alarm, puzzles without a clock
- the sound worlds harp, marimba, music box and spheres, and the double star
- unlimited hints
- with Family Sharing
At launch, the one-time purchase Cosmosono Plus “Forever” is available at a founders’ price – up to and including 10 January 2027.
Prices are shown in the App Store and in the app. Subscriptions renew automatically unless you cancel at least 24 hours before the end of the current period (Settings → [your name] → Subscriptions). Cancel at least 24 hours before the free trial ends and you pay nothing. The one-time purchase is not a subscription.
Why is the game called Cosmosono?
“Cosmos” is the universe. In Latin, “sono” means “I sound”, and in Italian, “cosmo sono” roughly means “I am cosmos”. So Cosmosono is a universe that sounds.
The idea is old. Pythagoras already believed that the planets make a sound as they move along their orbits: a music of the spheres that we just can’t hear. In 1619, Johannes Kepler wrote a book about the harmony of the world (Harmonices Mundi). In it, he gave each planet its own melody: the faster a planet moves along its orbit, the higher it sounds.
In Cosmosono, every orbit really sounds: planets pulse on their orbits, their pulses add up to a signal, and the signal becomes a melody. And like Jocelyn Bell, who discovered the first pulsar in 1967, Seismo and Professor Halley listen for signals from space.
Help and frequently asked questions
How do I restore a purchase?
In the app under Settings → “Restore Purchases”, with the same Apple Account you bought with.
How do I cancel a subscription?
In your iPhone or iPad Settings → your name → Subscriptions, or in the app under Settings → “Manage subscription”. Cancel at least 24 hours before the free trial ends and you pay nothing.
My progress is missing on my other device.
Sync runs through your own iCloud. Sign in to both devices with the same Apple Account and keep iCloud turned on for Cosmosono.
Does Plus cover my whole family?
Yes. Cosmosono Plus supports Family Sharing: everyone in your family group gets Plus on their own devices, with their own progress.
What is the radio window?
From your first day on, the radio window to Seismo’s home opens again and again, at noon, and brings the next signals or a new chapter. On the journey page, the app shows when it opens next.
How do I get new star systems in Zen?
You start with a small selection. Stars and rewards bring new star systems, quickly at first, up to 48 in all. You earn stars in the chapters and in the daily signal. The daily signal and chapters 1–3 are free, so your library grows without Plus too. The star systems are the same with and without Plus, and Listen and Fall asleep share them.
Why does the app ask a multiplication question in Radio pals?
Radio pals is also meant for the youngest players. So before the Plus page or a link to the web opens there, the app asks grown-ups to solve a small multiplication. A wrong answer simply brings a new question.
I can’t hear anything.
Cosmosono always starts muted so it never surprises you with sound. Tap the speaker button in the game.
Does Cosmosono need an internet connection?
No. The game works fully offline. The app only uses Apple services for App Store purchases and iCloud sync.
How do I delete my progress?
In the app under Settings → “Reset progress”. Solved signals, stars, streak and awards are deleted – on your other devices with the same iCloud too. Your solar system stays.
Contact
Questions, bugs or ideas? Write to us. Please include your device and the app version (in the app: Settings → About).
Email: kontaktnospam.@orthonormal-spamfallestudio.com
Go to the contact form