# ZZZ Polyrhythm — Polyrhythm metronome

> Polyrhythm metronome (iPhone/iPad app by SMOLT STAGE, K.K..)

- Source: https://appshunter.io/ios/app/zzz-polyrhythm/id6773375285 (this page in markdown: same URL + `.md`)
- Developer: [SMOLT STAGE, K.K.](https://appshunter.io/developer/1708601451)
- Category: Music, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: American English, Japanese
- Released: 2026-06-11
- Data updated: 2026-07-20
- User reviews in markdown: https://appshunter.io/ios/app/zzz-polyrhythm/id6773375285/reviews.md

## What is ZZZ Polyrhythm?

Zzz Polyrhythm is a polyrhythm-focused metronome that lets you layer multiple
  rhythms simultaneously for advanced rhythmic practice. From classical
  2-against-3 to jazz shuffle to contemporary 7-against-11 — instantly build any
  rhythm pattern you can imagine and play it back with professional-quality
  voices.

  Key Features

  [Base Beat — the time-keeper]
  - Time signature: any numerator (1-16) and denominator (2 / 4 / 8 / 16)
  - BPM: precise control from 30 to 240
  - Tap Tempo: detect any tempo in real time
  - 8 voices: Wood Block / Click / Cowbell / Sine / Square / Tick / Hi Click /
  Low Thud

  [Layered Rhythms — Overlay]
  Layer additional rhythms on top of the base beat to construct complex
  polyrhythms.
  - Starting beat: not only "beat 1, beat 2" but also fractional positions like
  "beat 1.5"
  - Length: whole / half / quarter / eighth / sixteenth / thirty-second note ×
  none / dotted / double-dotted
  - Subdivisions: any tuplet from 2 to 11
  - Shuffle mode: play only the first and last clicks for a jazz swing feel
  - Timing offset: slide the start/end positions back and forth to fine-tune
  swing
  - Voice: choose an independent voice for each overlay from 8 sound presets
  
  [Visualizer]
  Concentric ring display lets you see rhythm timing at a glance. A dot lights
  up the moment each click fires, helping you grasp polyrhythm structure
  visually.

  [Presets] (Premium)
  Save your favorite rhythm configurations with custom names. Recall with one
  tap. Browse multiple presets and switch any time.
  
  [Phase-preserving BPM changes]
  Change BPM in the middle of a beat — the rhythm doesn't reset, it smoothly
  accelerates or decelerates, just like a professional studio metronome.

  Who it's for
  
  - Drummers / percussionists training complex rhythmic sense
  - Jazz / fusion players developing swing feel
  - Instrumentalists practicing 3-, 5-, 7-tuplet figures
  - Composers / arrangers analyzing multi-voice rhythm relationships
  - Performers studying traditional cross-rhythms and contemporary music
  
  Languages
  
  日本語 / English / 中文 / 한국어 / Español / Português
  
  Switch languages manually from the hamburger menu, or have the app follow your
  device's system language. 
  
  Free vs Premium
  
  [Free]
  - Base beat + up to 2 overlay layers
  - All 8 voices / any time signature / BPM 30-240
  - Tap Tempo / Shuffle / full feature access
  - Discreet banner ad + occasional interstitial
  
  [Premium (Ad-free)]
  - All ads removed
  - Add 3 or more overlay layers (unlimited)
  - Save / load / delete rhythm presets
  
  Subscription Details
  - Title: Premium (Ad-free)
  - Length: 1 month, auto-renewable
  - Price: 180 JPY / month
  
  Payment will be charged to your Apple ID account at confirmation of purchase.
  The subscription renews automatically unless it is canceled at least 24 hours
  before the end of the current period. Your account will be charged for renewal
  within 24 hours prior to the end of the current period. You can manage or
  cancel your subscription anytime in your App Store account settings after
  purchase.
  
  Terms of Use (EULA):
  https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
  Privacy Policy: https://smolt-stage.com/home/privacy/zzz-polyrhythm-privacy-policy-ios-en.html
  
  Developer
  
  SMOLT STAGE, K.K.
  © 2026 SMOLT STAGE, K.K.
  
  For questions and feature requests, please use the in-app feedback form. We
  hope this contributes to your musical practice.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| ZZZ Polyrhythm Premium | $0.99 | per month |



## Version history (last 2 releases)

### 1.0.1 — 2026-07-13

Added a marketing URL

### 1.0 — 2026-06-11

No release notes.

## More apps by SMOLT STAGE, K.K.

- [ZZZ Wake Up!](https://appshunter.io/ios/app/zzz-wake-up/id6768897512)
- [ZZZ Let's Read!](https://appshunter.io/ios/app/zzz-lets-read/id6771560607)
- [ZZZ HostLink](https://appshunter.io/ios/app/zzz-hostlink/id6778269713)
- [ZZZ FlashShare](https://appshunter.io/ios/app/zzz-flashshare/id6779496852)

All apps by SMOLT STAGE, K.K.: https://appshunter.io/developer/1708601451

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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 2026-07-20.*