Spinn vs Cube Synth Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spinn
This app offers a unique 4-band rotating modulation effect with individual rotor controls, customizable acceleration, and velocity-sensitive speed adjustments. It includes built-in amp modeling and room simulation for a versatile audio experience.
- 4-band rotating modulation
- Individual rotor speed controls
- Adjustable acceleration/deceleration
- Velocity-sensitive speed
- Custom amp modeling
- Room simulation
- AUv3 plugin support
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Spinn is a 4 band rotating modulation effect. It’s a bit similar to a Leslie but not aiming to replicate this character. 4 rotors with individual speed controls, acceleration and deceleration times, adjustable size and modulation. Each band also has a velocity control, which will adjust the speed according to the bands input level. Spinn features custom amp modelling (clean or hot) and room simulation. Global features: * Speed mode - (Slow, Fast, Off). * Room - (Small, Medium, Big) with mix control. * Amp - Clean or hot with 3 band equaliser and a drive control. * Stereo width control. * Crossover points * Input and output controls. And for each band: * Size - The rotor size * Mod - Modulation amount * Slow and fast speed control * Acceleration and deceleration times * Velocity - makes the speed change with input level * Level - Band level Spinn works both as a standalone app and as an AUv3 plugin. Full documentation available inside the app or at https://klevgrand.se/downloads/spinn-docs/ Audio examples and more info at https://klevgrand.se/products/spinn
Cube Synth Pro
Explore the power of additive synthesis with this app, allowing you to create complex soundscapes, vocal phrases, and rhythms. Easily morph between sound sources or dive deep into individual parameter control for precise sound design. Mimic natural instruments or vintage analog synths with unique features.
- Additive synthesis engine
- Sound morphing capabilities
- Over 400 sound presets
- Programmable arpeggiator
- Multiple built-in effects
- Standalone and AUv3 support
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Cube Synth Pro brings you the power and complexity of additive synthesis to your iPad studio. This kind of synthesis is well known for its potential capability of creating virtually any sound you can think of. But it’s also well renown for its huge amount of parameters you have to control for reasonable results. Therefore only a few synthesisers exists which uses this mighty synthesis technology. With Cube Synth Pro this prejudice will no longer be true. Specific sound morphing capabilities enables you to easily create complex evolving sound scapes, vocal phrases or stunning rhythms simply by choosing up to four sound sources from a predefined set. Then add one of the predefined envelopes and a unique, complex sound preset containing thousands of parameters is created! If you want to dive deeper into the inner secrets of this synthesis monster you can manipulate each parameter individually to get precise control over the sound. A number of high level parameters such as Brightness and Harmonic spread control hundreds of synthesis parameters in a way modelled after the inner workings of natural instruments. In addition to emulating natural instruments Cube Synth Pro gives you the ability to mimic the behaviour of the sound characteristic of vintage polyphonic synths by modelling the slight deviation from perfection which are inherent of analog systems. Cube Synth Pro gives you also a new method of getting randomly generated sound patches in a way you never experienced before: roll the dice! Every single try gives you a new unique sound patch, really every try, promised… Synthesis • Over 400 sound presets • Four morphing sound sources • Up to 512 partials per voice • Harmonic/Inharmonic spectra • User programmable noise spectra • Morphing filter banks • Unison mode with up to 8 oscillators per voice • Unique voice detuning scheme to simulate imperfections of poly analog synths. • 3 Envelopes with 64 time/level segments and tempo sync • Multi level random preset generator • 64 time/level segments per envelope Arpeggiator • Uses programmable sequences with up to 32 steps. • Can trigger single notes and chords. • Unique randomizer generates Arpeggios with 100% usability. • 32 Arpeggios included, unlimited useer arpeggios possible. • For each step you can program tie, accent, transposition and note order Effects • Chorus • Phaser • Overdrive • Ensemble • Echo/Delay • Reverb Global • Standalone App • AudioUnit AUv3 • Audiobus 3 compatible (Input slot) with state saving • Support for Ableton Link. • CoreMIDI / Virtual MIDI / Bluetooth MIDI • Audio recorder.
Verdict
Spinn and Cube Synth Pro both sit at 4.5 stars, but that hides the real split: 80% of Cube Synth Pro's written reviews are positive against 50% of Spinn's. Cube Synth Pro also leads on price ($9.99 vs $15.99) and update cadence (every 2 months vs every 8 months). 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
Spinn costs $15.99 and Cube Synth Pro $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Spinn holds the better App Store score, 4.5 against 4.3. Both are backed by a comparable volume of ratings — 4 and 16 respectively. Written reviews complicate that: 50% of Spinn's written reviews are positive against 80% of Cube Synth Pro's, so the app with the better star average is not the one people write more warmly about.
Spinn ships an update every 8 months, Cube Synth Pro every 2 months. The most recent releases landed on September 30, 2026 and September 25, 2026 respectively.
| Parameter | Spinn | Cube Synth Pro |
|---|---|---|
| Price | $15.99 | $9.99 — better |
| Rating | 4.5 (4 ratings) — better | 4.3 (16 ratings) |
| Positive reviews | 50.0% of reviews | 80.0% of reviews — better |
| Number of ratings | 4 | 16 — better |
| Update frequency | Every 8 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPad |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | Klevgrand Produkter AB | Harry Gohs |
Customer experience
Spinn
Cube Synth Pro
In-app purchases
Spinn
No in-app purchases
Cube Synth Pro
No in-app purchases


