# mKer vs In Theory

The clearest difference is review sentiment: In Theory at 100% against mKer's 64%. In Theory also leads on rating (5.0 vs 4.5) and update cadence (weekly vs every 3 weeks). mKer's advantage is ratings volume (22 vs 4) and price ($3.99 vs $4.99). On ads, in-app purchases, monetization model and iOS requirement there is nothing between them.

mKer costs $3.99 and In Theory $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

In Theory holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: mKer has 22 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 64% of mKer's written reviews are positive against 100% of In Theory's.

mKer ships an update every 3 weeks, In Theory weekly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | mKer | In Theory |
| --- | --- | --- |
| Price | **$3.99** | $4.99 |
| Rating | [4.5 (22 ratings)](https://appshunter.io/ios/app/mker/id1635296839/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/in-theory-interval-keyboard/id1667984658/reviews)** |
| Number of ratings | **22** | 4 |
| Positive reviews | 63.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Paid | Paid |
| Size | 57 MB | 7 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Axart Labs OU](https://appshunter.io/developer/1814434331) | [Cem Olcay](https://appshunter.io/developer/523633853) |

## What reviewers say

### mKer

[App page](https://appshunter.io/ios/app/mker/id1635296839)

A versatile MIDI step sequencer designed for music creation. It offers multiple outputs, extensive pattern and lane customization, and advanced step editing. Best used within an AUv3 host app for sound generation.

**Highlights:** 8 MIDI outputs, 64 Patterns with 16 Lanes each, Customizable Steps and Step Size per Lane, Advanced Step Parameters (Pitch, Velocity, Probability, etc.), Flexible Editor with Step Entry Keyboard, 32 Clips with Repeat Functionality, Performance Tab with Assignable Sliders and Morphing

**Features:** macOS Compatibility

**In-app purchases:** none


### In Theory

[App page](https://appshunter.io/ios/app/in-theory-interval-keyboard/id1667984658)

This app provides a unique interval-based MIDI keyboard with over 110 scales. It allows for flexible chord creation by toggling additional intervals and notes from different octaves. It integrates with external MIDI keyboards and sequencers for advanced music production.

**Highlights:** Interval-based MIDI keyboard, Over 110 built-in scales, Customizable chord voicing, MIDI keyboard input support, MIDI CC message control, AUv3 plugin compatibility, Visual scale and note display

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

**In-app purchases:** none


## Frequently asked questions

### Is mKer free?

mKer costs $3.99, with no in-app purchases.

### Is In Theory free?

In Theory costs $4.99, with no in-app purchases.

### Which has better reviews, mKer or In Theory?

In Theory is rated higher. mKer averages 4.5 out of 5 from 22 ratings, while In Theory averages 5.0 from 4 ratings.

### Do mKer or In Theory have ads?

Neither mKer nor In Theory shows ads.

### Which is updated more often, mKer or In Theory?

mKer ships an update every 3 weeks, and In Theory weekly. Most recently, mKer was updated on October 23, 2026 and In Theory on October 24, 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.*