# メトロノーム Poly vs Jazz Time Trainer

The clearest difference is ads: Jazz Time Trainer at none against メトロノーム Poly's shown. Jazz Time Trainer also leads on iOS requirement (13.0 vs 15.6). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

メトロノーム Poly ships an update every 6 days, Jazz Time Trainer every 4 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | メトロノーム Poly | Jazz Time Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 days | **Every 4 days** |
| Size | 6 MB | 19 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nito Kiyoshi](https://appshunter.io/developer/1861743869) | [Sangwoo Shin](https://appshunter.io/developer/6778440317) |

## What reviewers say

### メトロノーム Poly

[App page](https://appshunter.io/ios/app/poly-2/id6756605549)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Jazz Time Trainer

[App page](https://appshunter.io/ios/app/jazz-time-trainer/id6778440315)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is メトロノーム Poly free?

メトロノーム Poly is free to download, with no in-app purchases.

### Is Jazz Time Trainer free?

Jazz Time Trainer is free to download, with no in-app purchases.

### Do メトロノーム Poly or Jazz Time Trainer have ads?

メトロノーム Poly shows ads; Jazz Time Trainer does not.

### Which is updated more often, メトロノーム Poly or Jazz Time Trainer?

メトロノーム Poly ships an update every 6 days, and Jazz Time Trainer every 4 days. Most recently, メトロノーム Poly was updated on October 30, 2026 and Jazz Time Trainer on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*