WretchUp vs EG WaveSHAPER
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
EG WaveSHAPER
Create unique sounds by drawing waveforms or shaping built-in ones. Blend them with analog and sub oscillators, and automate parameters with drawable LFOs and envelopes. Explore a hybrid waveshaping and wavetable engine for complex sonic textures.
- Hybrid Wavetable/Waveshaping engine
- Draw custom wavetables
- Assignable LFOs and Envelopes
- Built-in Reverb, Delay, and EG Crush FX
- Core MIDI support
- AUv3 plugin compatibility
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EG WaveSHAPER is the first synthesizer that lets you create your sound with a finger. Draw the waveform on the screen or shape a builtin one, mix it with a classic analog oscillator and a sub oscillator and automate all the knobs with 2 drawable LFOs and 2 ENVs HYBRID WAVESHAPING ENGINE 'Waveshaping is a synthesis-and-transformation technique that turns simple sounds into complex sounds' 2 wavetables can be designed and morphed to create unique and dynamic sounds under your finger, choosing the morph attack and release; complex spectra can be created waveshaping the oscillator and introducing non linear distortion, rich harmonics and a tube-vacuum behaviour. The hybrid Waveshaping/Wavetable engine lets you combine a wavetable oscillator with a classic oscillator and a sub oscillator, to add additional sound layers and depth. LFOs & ENVs 2 Lfo and 2 Envelopes with indipendent time can be assigned to virtually any of the synth parameters. They can also be graphically designed with the touch of your finger or you can choose among the builtin envelopes. OTHER FEATURES - Hybrid Wavetable/Waveshaping engine - Draw your wavetable oscillator with your finger - 100+ presets (Pad, Lead, Bass and Fx) - 30+ builtin waveforms to use and modify - 2 LFOs and 2 ENVs assignable to any parameter - FX: Reverb, Delay and EG Crush - Detune osc to create huge unison sounds - FM and Noise with configurble FM Ratio and Noise eq - VCF and Reso filters - Complete presets management with export and share - Core MIDI: MIDI in, MIDI CC, MIDI channel pressure control - AU3 with full knobs parameters automation - Universal for iPad & iPhone
Screenshots
Verdict
The clearest difference is rating: EG WaveSHAPER at 4.8 against WretchUp's 3.1. EG WaveSHAPER also leads on iOS requirement (9.1 vs 11.0). WretchUp's advantage is price ($4.99 vs $8.99). On review sentiment, ratings volume, update cadence and ads 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
WretchUp costs $4.99 and EG WaveSHAPER $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
EG WaveSHAPER holds the better App Store score, 4.8 against 3.1. Both are backed by a comparable volume of ratings — 9 and 23 respectively. Written reviews complicate that: 91% of WretchUp's written reviews are positive against 85% of EG WaveSHAPER's, so the app with the better star average is not the one people write more warmly about.
WretchUp ships an update every 3 weeks, EG WaveSHAPER fortnightly. The most recent releases landed on October 3, 2026 and October 16, 2026 respectively.
| Parameter | WretchUp | EG WaveSHAPER |
|---|---|---|
| Price | $4.99 — better | $8.99 |
| Rating | 3.1 (9 ratings) | 4.8 (23 ratings) — better |
| Positive reviews | 90.9% of reviews — better | 84.6% of reviews |
| Number of ratings | 9 | 23 — better |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 | 9.1 — better |
| Further details — not scored | ||
| Size | 15 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | MoMinstruments GbR | Elliott Garage |
Customer experience
WretchUp
EG WaveSHAPER
In-app purchases
WretchUp
No in-app purchases
EG WaveSHAPER
No in-app purchases









