# Idle Spirits — 40Hz Brain Boost & Spirit Idle

> 40Hz Brain Boost & Spirit Idle (iPhone/iPad app by KEIK, LIMITED LIABILITY COMPANY.)

- Source: https://appshunter.io/ios/app/idle-spirits/id6757659907 (this page in markdown: same URL + `.md`)
- Developer: [KEIK, LIMITED LIABILITY COMPANY](https://appshunter.io/developer/1854674572)
- Category: Games, Health & Fitness, Casual, Music
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 101 MB
- Languages: English
- Released: 2026-01-13
- Data updated: 2026-08-14
- User reviews in markdown: https://appshunter.io/ios/app/idle-spirits/id6757659907/reviews.md

## What is Idle Spirits?

Casual idle healing game with 40Hz brain-boosting BGM, immersive spatial audio, and spirit collection.

◆ 40Hz BGM for Brain Activation
Features BGM containing 40Hz frequency, known to support brain health. Just listen to the meditation music while idling to relax and potentially boost brain function.

◆ Immersive Spatial Audio
80+ nature sounds with AVAudioEngine-powered reverb and spatial panning. Hear birds from the left, streams from the right. Each of the 10 stages has its own unique sound theme - forest, night, ocean, sakura, autumn, and rain.

◆ Simple Idle Gameplay
No complex controls needed. Just tap the screen to collect spirits. Perfect for short breaks or bedtime relaxation.

◆ 57 Spirit Collection
Meet diverse spirits across 10 beautiful stages, from forest fairies to cosmic beings. Register them in your collection book and enjoy tap effects.

◆ Healing Sound Features
- 40Hz Meditation BGM: Frequency known for brain benefits
- Healing Forest BGM: 4 soothing tracks
- Overtone Bath: Ultimate relaxation experience
- Sleep Timer: Perfect for bedtime
- Ambient Soundscape: Nature sounds play between hits

◆ Two Modes
[Chill Mode]
Main mode for relaxed spirit collecting. Meet 57 spirits across 10 beautiful stages.

[Survival Mode]
Special mode unlocked after completing Chill Mode. Thrilling dash-to-survive gameplay.

◆ Stages
- Healing Forest: Meet spirits in lush greenery
- Bird Paradise: A space where beautiful birds dance
- Firefly Night: In the midst of magical lights
- Cherry Blossom Spring: Under falling petals
- Autumn Twilight: A world dyed in sunset
- Water Paradise: By refreshing waters
- Crystal Cave: In mystical sparkles
- Elemental Altar: Where four elements meet
- Otherworldly Gate: A door to unknown realms
- Rainy Garden: A fresh garden washed by the rain

Complete your spirit collection while listening to 40Hz BGM.


## Version history (last 5 releases)

### 1.60 — 2026-08-04

Minor improvements and bug fixes.

### 1.50 — 2026-06-14

v1.50 - Smoother Performance

◆ Performance Improvements
- Optimized internals so the game stays smooth even during long sessions
- Reworked cleanup of spirits and effects to stop memory waste
- More stable frame rate for smoother ball and trail motion

◆ Cleaner Look
- Tidied up small decorations on the edges so you can focus on the calming world

◆ More
- Minor tweaks and stability improvements

Enjoy your relaxing idle time with the spirits.

### 1.4 — 2026-06-13

v1.40 - Große Grafik-Erneuerung & neue Stage

◆ Komplett neue Grafik
- Alle 57 Geister im weichen, beruhigenden Design neu gestaltet
- Schmetterlinge, Windräder, Windspiele, Vögel, Fische u.v.m. als schöne Illustrationen neu gezeichnet
- Verbesserte Aurora-Hintergründe und Leuchteffekte

◆ Neue Stage: Regengarten
- Eine beruhigende neue Stage voller sanftem Regen und Wassertropfen
- Triff Frösche, Schnecken und Kleeblätter nach dem Regen
- Das Wasserparadies hat jetzt noch mehr Fische

◆ Kombo-Klang-Harmonien
- Die Töne steigen angenehm, solange deine Kombo anhält
- Natürlicherer, vollerer Klang

◆ Außerdem
- Verbesserte Erscheinungsorte der Geister
- Audio-Fehlerbehebungen und mehr Stabilität

### 1.3 — 2026-04-10

v1.3 - Immersive Sound Overhaul

◆ Richer Soundscapes
- 80+ new nature sounds integrated (birds, streams, crickets, temple bells, campfire and more)
- Each stage now has its own unique sound theme
- Ambient soundscape layer: hear nature sounds between hits

◆ Spatial Audio Engine
- New AVAudioEngine with reverb effects per theme
- Spatial panning: sounds come from left/right based on position
- Forest reverb, Cathedral reverb for night, Ocean reverb with underwater feel

◆ Performance Boost
- Smoother gameplay with reduced particle effects
- Lower GPU usage for less heat
- Removed confusing vortex gimmick

◆ Other
- Version display now shows correctly in Settings
- General stability improvements

### 1.2 — 2026-02-05

◆ 40Hz Brain Activation BGM Added
New meditation BGM featuring 40Hz frequency, known to support brain health.

◆ Bug Fixes
- Fixed language switching issue in Settings
- Other stability improvements

Relax and activate your brain with 40Hz BGM!

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## More apps by KEIK, LIMITED LIABILITY COMPANY

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All apps by KEIK, LIMITED LIABILITY COMPANY: https://appshunter.io/developer/1854674572

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-14.*