# WretchUp vs In Theory

The clearest difference is rating: In Theory at 5.0 against WretchUp's 3.1. In Theory also leads on update cadence (weekly vs every 3 weeks) and review sentiment (100% vs 91%). WretchUp's advantage is iOS requirement (11.0 vs 13.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

WretchUp costs $4.99 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 3.1. Both are backed by a comparable volume of ratings — 9 and 4 respectively. Written reviews point the same way: 91% of WretchUp's written reviews are positive against 100% of In Theory's.

WretchUp ships an update every 3 weeks, In Theory weekly. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | WretchUp | In Theory |
| --- | --- | --- |
| Price | $4.99 | $4.99 |
| Rating | [3.1 (9 ratings)](https://appshunter.io/ios/app/wretchup/id928543264/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/in-theory-interval-keyboard/id1667984658/reviews)** |
| Number of ratings | **9** | 4 |
| Positive reviews | 90.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Paid | Paid |
| Size | 15 MB | 7 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MoMinstruments GbR](https://appshunter.io/developer/953815356) | [Cem Olcay](https://appshunter.io/developer/523633853) |

## What reviewers say

### WretchUp

[App page](https://appshunter.io/ios/app/wretchup/id928543264)

This app offers a unique audio manipulation experience, allowing users to create sonic mayhem with pitch-shifted delays, filters, and sampling. It's designed for live performance and studio use, enabling musicians and sound enthusiasts to generate wild noises and unique effects.

**Highlights:** Pitch-shifted delay with feedback and filter, Live performance-oriented controls, Gesture-based play, Record vocals and instruments, Sample and manipulate loops, Inter-App-Audio and Audiobus support

**Features:** Vision Pro support

**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 WretchUp free?

WretchUp costs $4.99, with no in-app purchases.

### Is In Theory free?

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

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

In Theory is rated higher. WretchUp averages 3.1 out of 5 from 9 ratings, while In Theory averages 5.0 from 4 ratings.

### Do WretchUp or In Theory have ads?

Neither WretchUp nor In Theory shows ads.

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

WretchUp ships an update every 3 weeks, and In Theory weekly. Most recently, WretchUp was updated on November 1, 2026 and In Theory on November 3, 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.*