# Scent Harmony vs Electroll

The clearest difference is iOS requirement: Scent Harmony at 9.0 against Electroll's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Scent Harmony ships an update every 11 months, Electroll every 7 months. The most recent releases landed on October 1, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Scent Harmony | Electroll |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 7 months** |
| Size | 4 MB | 16 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Immaculate Nduta](https://appshunter.io/developer/1620860472) | [Dong Huang](https://appshunter.io/developer/1456095361) |

## What reviewers say

### Scent Harmony

[App page](https://appshunter.io/ios/app/scent-harmony/id1670604472)

**Features:** macOS Compatibility

**In-app purchases:** none


### Electroll

[App page](https://appshunter.io/ios/app/electroll/id6737530607)

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

**In-app purchases:** none


## Frequently asked questions

### Is Scent Harmony free?

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

### Is Electroll free?

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

### Do Scent Harmony or Electroll have ads?

Neither Scent Harmony nor Electroll shows ads.

### Which is updated more often, Scent Harmony or Electroll?

Scent Harmony ships an update every 11 months, and Electroll every 7 months. Most recently, Scent Harmony was updated on October 1, 2026 and Electroll on October 4, 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.*