# iHarmony vs bismark CtrlSlide

The clearest difference is price: iHarmony at $0.99 against bismark CtrlSlide's $1.99. bismark CtrlSlide's advantage is iOS requirement (15.0 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

iHarmony costs $0.99 and bismark CtrlSlide $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iHarmony ships an update every 5 weeks, bismark CtrlSlide every 2 months. The most recent releases landed on September 25, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | iHarmony | bismark CtrlSlide |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | **[4.8 (12 ratings)](https://appshunter.io/ios/app/iharmony/id292413210/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 77.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Paid | — |
| Size | 5 MB | 19 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alberto De Bortoli](https://appshunter.io/developer/292413213) | [bismark LLC](https://appshunter.io/developer/1213793300) |

## What reviewers say

### iHarmony

[App page](https://appshunter.io/ios/app/iharmony/id292413210)

This app provides musicians with instant access to a comprehensive music theory reference. It includes scales, chords, harmonizations, and notes with audio playback and support for multiple notation systems. It's designed for songwriting, studying, and quick reference.

**Highlights:** 1500+ scales, chords, and harmonizations, Chord harmonizations for every scale, Audio playback for every entry, Four notation systems (English, Italian, German, French), Full-text search, Offline functionality

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

**In-app purchases:** none

**What reviewers like**

- 👍 Quick and easy to use
- 🎶 Great for learning scales and chords
- 💡 Useful for songwriting and composition
- 🎵 Provides audio playback of scales/chords
- 📚 Comprehensive music theory reference

**What reviewers complain about**

- ❌ Audio issues (no sound, distorted sound)
- 🎛️ Some incorrect notation/spelling
- 🎨 Outdated UI/design
- ❓ Confusing navigation/layout
- 🔊 Sound not matching notes

**Reported bugs**

- Audio not working on iPhone
- Database null error
- Speaker distortion at high volume
- Playback sounds stilted/uneven
- Info link works irregularly or doesn't appear

**Requested features**

- Save favorite scales
- Add more exotic scales
- Allow harmonic playback (all notes simultaneously)
- Provide other theory features (harmonic substitutions, polychords, inversions)
- Add a search function for chords/scales


### bismark CtrlSlide

[App page](https://appshunter.io/ios/app/bismark-ctrlslide-midi-cc/id1553855327)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iHarmony free?

iHarmony costs $0.99, with no in-app purchases.

### Is bismark CtrlSlide free?

bismark CtrlSlide costs $1.99, with no in-app purchases.

### Do iHarmony or bismark CtrlSlide have ads?

Neither iHarmony nor bismark CtrlSlide shows ads.

### Which is updated more often, iHarmony or bismark CtrlSlide?

iHarmony ships an update every 5 weeks, and bismark CtrlSlide every 2 months. Most recently, iHarmony was updated on September 25, 2026 and bismark CtrlSlide on September 19, 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.*