Comparison

Spinn vs BTS FX

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

Head to head
About

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.

Highlights
  • 4-band rotating modulation
  • Individual rotor speed controls
  • Adjustable acceleration/deceleration
  • Velocity-sensitive speed
  • Custom amp modeling
  • Room simulation
  • AUv3 plugin support
Read full description

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

About

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.

Highlights
  • 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
Features
Read full description

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

BTS FX2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Spinn costs $15.99 and BTS FX $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Spinn versus BTS FX: the parameters behind the verdict, then further details
ParameterSpinnBTS FX
Price$15.99$9.99 — better
Rating4.5 (4 ratings)5.0 (3 ratings) — better
Positive reviews50.0% of reviews—
Number of ratings4 — better3
Update frequencyEvery 8 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS13.012.0 — better
Further details — not scored
Size16 MB25 MB
Age rating4+4+
DeveloperKlevgrand Produkter ABDmytro Kiro

Customer experience

Spinn

All ratings4 ratings
Positive75.0%
Neutral25.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

BTS FX

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Spinn

No in-app purchases

None

BTS FX

No in-app purchases

Questions

Is Spinn free?
Spinn costs $15.99, with no in-app purchases.
Is BTS FX free?
BTS FX costs $9.99, with no in-app purchases.
Which has better reviews, Spinn or BTS FX?
BTS FX is rated higher. Spinn averages 4.5 out of 5 from 4 ratings, while BTS FX averages 5.0 from 3 ratings.
Do Spinn or BTS FX have ads?
Neither Spinn nor BTS FX shows ads.
Which is updated more often, Spinn or BTS FX?
Spinn ships an update every 8 months, and BTS FX every 2 days. Most recently, Spinn was updated on September 30, 2026 and BTS FX on September 29, 2026.

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