Spinn vs BTS FX
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
BTS FX
This audio effect plugin offers a versatile multi-effect suite for music production. It features a bitcrusher, distortion, reverb with a freeze function, and a limiter, all controllable within compatible DAWs.
- Bitcrusher with adjustable rate and bit
- Distortion module with various algorithms
- Reverb module with freeze function
- Brick-wall limiter
- Oversampling module (2x, 4x, 8x)
- Stereo/Mode processing
- Parameter randomizer
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BTS FX emerges as a dynamic multi-effect plugin, incorporating a diverse set of modules. Available on as Auv3 audio effect or can be loaded in IAA. App requires compatible Auv3 or IAA host (DAW) to load an effect. Among its Main features are: Pre/Post Moog Ladder Filter Bitcrusher with adjustable Rate and Bit controls Distinctive Distortion Module offering various reshaping algorithms. The plugin boasts a lush Reverb Module with a unique Freeze function , complemented by a Brick-wall Limiter Module and convenient Input/Output Gain adjustments. Additionally the Oversampling module provides 2x, 4x, and 8x factors, featuring both polyphase allpass IIR and FIR versions with latency compensation. Further enhancing its capabilities, BTS includes Stereo/Mode processing and a Parameter Randomiser for added creative exploration. Preset Manager, etc.
Screenshots
Verdict
The clearest difference is rating: BTS FX at 5.0 against Spinn's 4.5. BTS FX also leads on update cadence (every 2 days vs every 8 months) and price ($9.99 vs $15.99). 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
Spinn costs $15.99 and BTS FX $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
BTS FX holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 4 and 3 respectively.
Spinn ships an update every 8 months, BTS FX every 2 days. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.
| Parameter | Spinn | BTS FX |
|---|---|---|
| Price | $15.99 | $9.99 — better |
| Rating | 4.5 (4 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 4 — better | 3 |
| Update frequency | Every 8 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Klevgrand Produkter AB | Dmytro Kiro |
Customer experience
Spinn
BTS FX
In-app purchases
Spinn
No in-app purchases
BTS FX
No in-app purchases






