# OnStem vs Stemulator

The clearest difference is ads: Stemulator at none against OnStem's shown. Stemulator also leads on update cadence (every 9 days vs every 3 weeks) and device support (4 vs 2). On price and in-app purchases there is nothing between them.

Both are free to download. OnStem sells 4 in-app purchases, starting at $0.99 per month and Stemulator sells 8 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

OnStem ships an update every 3 weeks, Stemulator every 9 days. Both last shipped on November 5, 2026.

## The numbers

| Metric | OnStem | Stemulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (13 ratings)](https://appshunter.io/ios/app/stemulator/id6757211000/reviews)** |
| Number of ratings | — | **13** |
| Positive reviews | — | 94.4% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 137 MB | 60 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [阳 刘](https://appshunter.io/developer/1616314142) | [Stemulator LLC](https://appshunter.io/developer/1865353381) |

## What reviewers say

### OnStem

[App page](https://appshunter.io/ios/app/onstem-local-music-split/id6756013787)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OnStem Pro – Monthly | $0.99 | per month |
| OnStem Pro – Quarterly | $2.39 | per 3 months |
| OnStem Pro – Annual | $8.99 | per year |
| OnStem Pro – Lifetime | $9.99 | one-time |


### Stemulator

[App page](https://appshunter.io/ios/app/stemulator/id6757211000)

This app uses advanced audio separation models to extract individual elements from any song with studio-quality precision. It offers modes for producers to download stems and for musicians to play along with real-time mixing and chord mapping.

**Highlights:** Extract up to 18 stems per track, Producers Mode for stem downloads, Musicians Mode for real-time mixing, Generate MIDI chord maps, Real-time chord mapping and waterfall MIDI piano, Supports major audio formats for import and export

**Features:** Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Professional | $4.99 | per month |
| Studio | $9.99 | per month |
| Audiophile | $19.99 | per month |
| Production | $29.99 | per month |
| Professional (Annual) | $39.00 | per year |
| Studio (Annual) | $79.00 | per year |
| Audiophile (Annual) | $149.00 | per year |
| Production (Annual) | $249.00 | per year |


## Frequently asked questions

### Is OnStem free?

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

### Is Stemulator free?

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

### Do OnStem or Stemulator have ads?

OnStem shows ads; Stemulator does not.

### Which is updated more often, OnStem or Stemulator?

OnStem ships an update every 3 weeks, and Stemulator every 9 days. Most recently, OnStem was updated on November 5, 2026 and Stemulator on November 5, 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.*