# SL OCTAPAD PRO vs Harmonium Lessons

The clearest difference is price: Harmonium Lessons at Free against SL OCTAPAD PRO's $4.99. Harmonium Lessons also leads on update cadence (every 2 weeks vs every 7 months). SL OCTAPAD PRO's advantage is in-app purchases (none vs 3) and iOS requirement (15.6 vs 18.0). On ads and device support there is nothing between them.

Harmonium Lessons is free to download; SL OCTAPAD PRO costs $4.99 up front. Harmonium Lessons sells 3 in-app purchases, starting at $9.99 per month. SL OCTAPAD PRO asks for nothing beyond the download.

SL OCTAPAD PRO ships an update every 7 months, Harmonium Lessons every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | SL OCTAPAD PRO | Harmonium Lessons |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Size | 73 MB | 10 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Amila Rathnayake](https://appshunter.io/developer/1802446958) | [Mitaanshu Agarwal](https://appshunter.io/developer/1896724075) |

## What reviewers say

### SL OCTAPAD PRO

[App page](https://appshunter.io/ios/app/sl-octapad-pro/id6746116666)

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

**In-app purchases:** none


### Harmonium Lessons

[App page](https://appshunter.io/ios/app/harmonium-lessons-soloist/id6776353071)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Harmonium Monthl | $9.99 | per month |
| Harmonium Yearl | $59.99 | per year |
| Soloist Harmonium Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is SL OCTAPAD PRO free?

SL OCTAPAD PRO costs $4.99, with no in-app purchases.

### Is Harmonium Lessons free?

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

### Do SL OCTAPAD PRO or Harmonium Lessons have ads?

Neither SL OCTAPAD PRO nor Harmonium Lessons shows ads.

### Which is updated more often, SL OCTAPAD PRO or Harmonium Lessons?

SL OCTAPAD PRO ships an update every 7 months, and Harmonium Lessons every 2 weeks. Most recently, SL OCTAPAD PRO was updated on November 3, 2026 and Harmonium Lessons 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.*