Comparison

IMPULSation vs GSiRotary

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

IMPULSation

This app is a powerful convolution reverb that lets you load custom impulse responses for endless sound possibilities. Recreate classic amp tones, spaces, and delays with optimized signal processing. It offers a user-friendly interface with essential controls for precise sound shaping.

Highlights
  • Load custom impulse responses (.wav, .aif)
  • AUv3 and AAX plugin support
  • 88 factory presets
  • MIDI Learn and Program Change
  • Pre-Delay, Wet/Dry, Decay controls
  • Stereo Widener
  • iCloud Backup and Sharing
Features
Read full description

IMPULSation is an impulse response/convolution reverb that allows you to load in your own impulses for an an unlimited amount of neverb and amp possibilities. To give you an idea of the power of this app: There are literally hundreds of thousands of impulses freely available online and our app will load them all, given that it’s properly formatted in either .wav or .aif format. Say for example you have an electric piano sound that you want to run through a classic Fender™ AMP. You do a web search for “Fender AMP Impulses” and pick from the thousands of possibilities. You will literally spend hours upon hours freely downloading all of the available spaces, amps, reverbs, and/or delays to use within your favorite AUv3 DAW. The technology of convolving and deconvolving is a method of putting in a signal through an amp, reverb unit, delay unit, or space and with sophisticated mathematical interpolations techniques, you can create a very close replica of the actual source. Our IMPULSation is specifically designed for AMPs, reverbs, delays, and spaces of which our code is optimized to detect which is being used. The detection allows us to optimize the signal for better CPU and for optimal sound. As with all of our other apps, our goal is always simplicity with power. We give you all the important features needed for a great sound, without being too complex. The features are as follows: NEW UPDATED FEATURES: ▪ BlueTooth MiDI Capable ▪ iCloud Backup and Sharing of Presets ▪ Enhanced AUv3 Preset Resizing ▪ Expansion Pack Banners and Branding ▪ Metal support, Faster UI, Faster loading, and major CPU Updates ▪ Two Mode MIDI Program Change General Features: - AUv3 - AAX - 88 Factory Presets - The ability to load in your own impulses using the iOS files app (Works With External Drives via iPadOS) - MIDI Learn parameter **SPECIAL NOTE: Importing works by selecting a folder with .aif or .wav files in it and all of the files will be imported from that folder. App Controls: - Pre-Delay - Wet Controls with Range control for precise scaling - Dry Controls - Decay Controls - Waveform View - Stereo Widener that enhances pre-stereo signals - Master Output Includes Over 200 Impulses from very popular vintage reverb units: - LEX200 - LEX480X - RLND RE201 - RLND DEP3 Echo - EMT 244 - NBA Lush - ASR-10/DP4 - Exotic Places - Special FX ------- ATTENTION iFX Rack Users: 1. The default reverbs are the ones from the FantasyVerb 2. We will be offering a paid IAP option to import impulses. ---------------- Terms and Privacy Notices: • EULA Terms of use - https://gospelmusicians.com/EULA.html • Privacy Policy - https://gospelmusicians.com/privacy-policy.html • Terms and Conditions - https://gospelmusicians.com/terms-conditions.html

About

GSiRotary

This AUv3 plugin emulates the iconic sound of Leslie rotary speakers for iPad. It offers detailed control over speeds, ramp times, balance, and microphone placement, along with built-in tube overdrive and reverb. Achieve authentic vintage speaker tones with low CPU impact.

Highlights
  • AUv3 plugin for compatible host apps
  • Emulates Leslie tube models (122, 147, etc.)
  • Adjustable speeds for upper and lower speakers
  • Adjustable ramp up and down times
  • Adjustable balance between speakers
  • Adjustable microphone position
  • Built-in tube overdrive and digital reverb
Read full description

Please note: this is an AUv3 plugin that can be used with compatible host Apps. GSiRotary for iPad is the portable version of the very same Rotary Speaker algorithm found in the software GSi VB3-II and in the hardware keyboards Crumar Mojo (Classic and Suitcase), Mojo Desktop, Mojo 61 as well as in the GSi Gemini. As a Rotary Speaker effect it reproduces the effect and the tonal characteristics of the famous Leslie speakers, specifically the tube models 122, 147, 142, 145 and 251. It's not based on one single model, because there's actually very little difference between these models. Changing some parameters can make it sound more like a model or more like another one, letting alone the fact that even two or more apparently identical Leslies of the same model would not sound really identical after more than 60 years. GSiRotary takes this into account and offers a parameter set that can help us reach the rotary speaker sound we have in mind. Main features: - very low impact on CPU and RAM - adjustable speeds for upper and lower speakers separately - adjustable ramp up and down times - adjustable balance between upper and lower - adjustable microphone position (angle and distance) - built-in tube overdrive and digital reverb - comes as AUv3 plugin - supports background audio

Screenshots

IMPULSation4 screens
GSiRotary2 screens

Verdict

The call

The clearest difference is price: IMPULSation at $9.99 against GSiRotary's $19.99. IMPULSation also leads on update cadence (every 4 months vs every 17 months) and ratings volume (14 vs 3). GSiRotary's advantage is review sentiment (80% vs 50%). On rating, 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

CostPrice · In-app purchases · Ads · Monetization

IMPULSation costs $9.99 and GSiRotary $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 3.7 for IMPULSation against 3.7 for GSiRotary. Both are backed by a comparable volume of ratings — 14 and 3 respectively. Written reviews are what separate them: 50% of IMPULSation's written reviews are positive against 80% of GSiRotary's.

UpkeepUpdate frequency

IMPULSation ships an update every 4 months, GSiRotary every 17 months. Both last shipped on October 24, 2026.

Scorecard4 real differences · 6 level
IMPULSation versus GSiRotary: the parameters behind the verdict, then further details
ParameterIMPULSationGSiRotary
Price$9.99 — better$19.99
Rating3.7 (14 ratings) — better3.7 (3 ratings)
Positive reviews50.0% of reviews80.0% of reviews — better
Number of ratings14 — better3
Update frequencyEvery 4 months — betterEvery 17 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size139 MB12 MB
Age rating4+4+
DeveloperMIDIculous LLCGenuine Soundware

Customer experience

IMPULSation

All ratings14 ratings
Positive64.3%
Neutral14.3%
Negative21.4%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

GSiRotary

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

None

IMPULSation

No in-app purchases

None

GSiRotary

No in-app purchases

Questions

Is IMPULSation free?
IMPULSation costs $9.99, with no in-app purchases.
Is GSiRotary free?
GSiRotary costs $19.99, with no in-app purchases.
Which has better reviews, IMPULSation or GSiRotary?
IMPULSation is rated higher. IMPULSation averages 3.7 out of 5 from 14 ratings, while GSiRotary averages 3.7 from 3 ratings.
Do IMPULSation or GSiRotary have ads?
Neither IMPULSation nor GSiRotary shows ads.
Which is updated more often, IMPULSation or GSiRotary?
IMPULSation ships an update every 4 months, and GSiRotary every 17 months. Most recently, IMPULSation was updated on October 24, 2026 and GSiRotary on October 24, 2026.

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