GSiRotary vs Morphimus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
Morphimus
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Morphimus is a playful, touch-first synth playground that turns simple gestures into rich, musical sound. Tap bubbles, slide the rainbow strip, spin the orbit wheel, glide along the tone stream, and jam drum pads to shape bright plucks, dreamy clouds, punchy beats, zappy FX, and flowing wave textures. With expressive live controls, colorful motion, and fast, responsive audio, Morphimus offers a fresh, hands-on way to explore music on iPhone and iPad. With advanced randomization features, exploration is at the heart of the experience. Re-roll the individual sound flavors to get a vastly different timbre, or use the global re-roll to roll a random combination of play style, sound flavor, key, and effects. You can also save and recall your favorite sounds.
Screenshots
Verdict
The clearest difference is price: Morphimus at $4.99 against GSiRotary's $19.99. Morphimus also leads on update cadence (every 11 days vs every 17 months). GSiRotary's advantage is iOS requirement (12.0 vs 18.6). On ads, in-app purchases and device support 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
GSiRotary costs $19.99 and Morphimus $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
GSiRotary ships an update every 17 months, Morphimus every 11 days. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.
| Parameter | GSiRotary | Morphimus |
|---|---|---|
| Price | $19.99 | $4.99 — better |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 17 months | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 12 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Genuine Soundware | SEAN IAN HALENWOOD |
In-app purchases
GSiRotary
No in-app purchases
Morphimus
No in-app purchases









