iFretless Brass vs WretchUp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iFretless Brass
This app allows string instrument players to create expressive music using a variety of brass and synth sounds. It features detailed sample libraries and advanced touch sensitivity for natural performance. Supports MIDI and Audio Unit integration for external devices and recording apps.
- Expressive brass and synth sounds
- Detailed sample library
- Advanced touch pressure detection
- Natural vibrato and slides
- MIDI input/output support
- Audio Unit integration
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iFretless Brass enables guitar and string instrument players to play expressive music with a variety of instruments. It includes a detailed library of samples from real brass instruments as well as a collection of classic synth sounds. Each note is sampled at nine different volume levels in order to capture the full range of tones produced by the original instrument. Key features: 1) Supports MIDI input and output for interface with external devices such as digital pianos and electronic wind instruments as well as virtual MIDI compatible iOS apps. 2) A patented algorithm uses the accelerometer accurately detects touch pressure on the screen and respond with dynamic selection of samples of the appropriate timbre and volume. 3) Responds to fretless vibrato and between-note slides in a natural way, making it one of the most expressive performance interfaces available anywhere. 4) MPE MIDI support 5) Audio Unit support allows you to use the app as a virtual instrument inside of audio recording and mixing apps such as GarageBand Sound library includes: Euphonium Trombone Trumpet Trumpet 2 Flugelhorn Tuba French Horn Muted Trumpet and a collection of classic synth samples
WretchUp
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.
- 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
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An effect instrument anyone can play - sonic anarchy in the palm of your hand. iOS Mars: "Barely controlled chaos“, "sonic extremes“, "well suited for live use“ Music App Blog: "if you like the occasional dose of sonic mayhem, then this is an app that will let you make it" WretchUp is the sonic instrument from the imagination of Mouse on Mars Instruments. Used by the duo in their live performances, it's a playable effect inspired by analog hardware. Sing into it, speak into it, plug in an instrument, sample sounds, and then make sonic mayhem. It's been tested in Mouse on Mars' live shows and used in studio albums. But now it's available to anyone - whether you're a musician wanting to create unique sounds or you just want to make some wild noises and frighten friends and enemies. // FEATURES - Pitch-shifted delay with feedback and filter - Unique controls, designed to be used in live performance and tested onstage - Play with gestures, even without looking closely at the screen - Record vocals or instruments from the built-in mic or another input - Sample loops and change their speed - Adjust the feedback loop, pitch, and filter for unique sounds - Make inputs by holding down your finger, or lock input for continuous sampling - Inter-App-Audio supported - Audiobus supported www.mouseonmars.com/mominstruments Features artwork by Rupert Smyth. Pure Data-based, open source patch created by Florian Grote and Peter Kirn with Mouse on Mars. App design by Oliver Greschke. Powered by free and open source software libpd. Note: like all mic-based effects, you need to enable microphone input. If you accidentally did not allow mic input, you can allow later via: Device settings, WretchUp, Data settings, Microphone, allow mic input.
Screenshots
Verdict
The clearest difference is rating: iFretless Brass at 4.9 against WretchUp's 3.1. WretchUp's advantage is review sentiment (91% vs 68%) and price ($4.99 vs $9.99). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
iFretless Brass costs $9.99 and WretchUp $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
iFretless Brass holds the better App Store score, 4.9 against 3.1. Both are backed by a comparable volume of ratings — 10 and 9 respectively. Written reviews complicate that: 68% of iFretless Brass's written reviews are positive against 91% of WretchUp's, so the app with the better star average is not the one people write more warmly about.
iFretless Brass ships an update every 6 weeks, WretchUp every 3 weeks. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.
| Parameter | iFretless Brass | WretchUp |
|---|---|---|
| Price | $9.99 | $4.99 — better |
| Rating | 4.9 (10 ratings) — better | 3.1 (9 ratings) |
| Positive reviews | 68.0% of reviews | 90.9% of reviews — better |
| Number of ratings | 10 — better | 9 |
| Update frequency | Every 6 weeks | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 241 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Mangoo Consulting Company Limited | MoMinstruments GbR |
Customer experience
iFretless Brass
WretchUp
In-app purchases
iFretless Brass
No in-app purchases
WretchUp
No in-app purchases









