Supported Features
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Dark Interface
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Differentiate Without Color Alone
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Sufficient Contrast
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Reduced Motion
Crystal Cavern Idle Mine
A quiet idle game, no sound
Only for iPhone
Free
iPhone
Now in 17 languages, set automatically by your iPhone. Plays the same whether you cannot hear or must stay quiet. 4 text sizes, 5 colour schemes including high contrast.
Crystal Cavern is an idle game with no sound at all.
Tap the crystal in the middle of the screen and you earn crystals. That is the whole basic move.
Spend them on buildings and the cave keeps earning every second, even while the app is closed. You can collect up to eight hours of it when you come back.
■ No sound
No music, no effects. If you cannot hear, or you are somewhere you cannot make noise, nothing is lost. Haptics are there instead.
■ You choose what reads well
Four text sizes. Five colour schemes, two of them maximum contrast — white on black and black on white.
■ Twelve seams
As you dig, the seam changes and the crystal shifts colour and shape. You start at Quartz; twelve layers lie below. Each rebirth opens a deeper one.
■ Rebirth
Melt everything down into cores. Each core adds +2% to your tap value and income, permanently. The deeper you dig, the more cores are left behind.
■ Glowing orbs
Now and then an orb drifts across the screen. Tap it before it fades for a bonus. The best one multiplies everything by five for thirty seconds.
■ Built to be easy to use
- Playable from a keyboard
- Respects the reduce-motion setting
- Progress saves itself on this device
- A save code moves your progress to another device
- Pause whenever you like; nothing accumulates while paused
About adverts: a short video plays only when you claim a bonus. The game is fully playable without watching one. No advert is ever required to progress.
Languages: 17 (English, Japanese, Chinese Simplified and Traditional, Korean, Spanish, French, German, Italian, Portuguese, Dutch, Polish, Russian, Turkish, Vietnamese, Thai, Indonesian), shown automatically in your iPhone's language.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- From one trillion up, crystals are now written short, like 1.23 × 10⁴¹, and the count at the top always fits on one line. Very large numbers no longer spill over several lines and push the buttons down
- Cores and the multiplier are shortened the same way
The developer, Yoshihiko Okano, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
The developer indicated that this app supports the following accessibility features. Learn More
For more information, visit the developer’s accessibility website .
Information
- Seller
- Yoshihiko Okano
- Size
- 5.5 MB
- Category
- Simulation
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later.
- iPhone
- Languages
English and 16 more
- English, Dutch, French, German, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Vietnamese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 Yoshihiko Okano