# Vetro vs polymachine

The clearest difference is rating: Vetro at 4.0 against polymachine's 3.4. Vetro also leads on in-app purchases (none vs 2). polymachine's advantage is update cadence (weekly vs every 2 months) and review sentiment (67% vs 40%). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. polymachine sells 2 one-off in-app purchases. Vetro asks for nothing beyond the download.

Vetro holds the better App Store score, 4.0 against 3.4. That said, the two scores are not equally well evidenced: polymachine has 13 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 40% of Vetro's written reviews are positive against 67% of polymachine's, so the app with the better star average is not the one people write more warmly about.

Vetro ships an update every 2 months, polymachine weekly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Vetro | polymachine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/vetro-visual-metronome/id1637121079/reviews)** | [3.4 (13 ratings)](https://appshunter.io/ios/app/polymachine/id6761276852/reviews) |
| Number of ratings | 2 | **13** |
| Positive reviews | 40.0% of reviews | **66.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 6 MB | 106 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Joan Duat](https://appshunter.io/developer/1866565344) | [Mike Gao](https://appshunter.io/developer/384844113) |

## What reviewers say

### Vetro

[App page](https://appshunter.io/ios/app/vetro-visual-metronome/id1637121079)

This app provides a visual metronome with dynamic beat synchronization via Ableton Link. It supports custom animations and works across multiple devices, enhancing practice and recording sessions.

**Highlights:** Visual metronome, Ableton Link synchronization, Custom GIF and Lottie animations, Multiple visualization modes, Cross-device support (iPhone, iPad, macOS), Adjustable time signatures

**In-app purchases:** none


### polymachine

[App page](https://appshunter.io/ios/app/polymachine/id6761276852)

This app offers a unique approach to music creation by combining geometric principles with modular synthesis. Explore generative algorithmic drums, oscillators, and harmonies, with specialized tools for 808s and kick drum integration.

**Highlights:** Geometric music theory integration, Modular synthesis engine, Generative algorithmic drums, Oscillators and harmonies, 808 and kick drum linking, Log drum pattern generator

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sound Expansion | $1.99 | one-time |
| Pro Features | $34.99 | one-time |


## Frequently asked questions

### Is Vetro free?

Vetro is free to download, with no in-app purchases.

### Is polymachine free?

polymachine is free to download, with in-app purchases available.

### Which has better reviews, Vetro or polymachine?

Vetro is rated higher. Vetro averages 4.0 out of 5 from 2 ratings, while polymachine averages 3.4 from 13 ratings.

### Do Vetro or polymachine have ads?

Neither Vetro nor polymachine shows ads.

### Which is updated more often, Vetro or polymachine?

Vetro ships an update every 2 months, and polymachine weekly. Most recently, Vetro was updated on October 30, 2026 and polymachine on October 31, 2026.

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