Comparison

ScalePlay 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

ScalePlay

This app generates intricate musical patterns and sequences using complex scale theory. It's a powerful tool for both music production and education, offering scale references, virtual instruments, and interactive playback features.

Highlights
  • Generates intricate ostinatos and sequences
  • Applies complex scale patterns
  • User-defined songforms and chord changes
  • Scale references for hundreds of scales
  • Nine virtual instruments and 128 sounds
  • Visualizes scale relations
  • Interactive playback with generated patterns
Features
Read full description

ScalePlay is a generative music app capable of producing the most intricate ostinatos and sequences by applying complex scale patterns over user defined songforms and chord changes. It can be used in music production and is also a fantastic tool for music education. It includes scale references for hundreds of scales, nine virtual instruments and 128 instrument sounds. Its unique set of features allows the musician to visualize scale relations and to play along with generated patterns. Modern musicians often practice playing scales according to organizing principles like thirds. What is meant by that is to play a scale tone, then its third, then the second scale tone, the third on top of that one and so forth. The exercise would result in the scale tones 1, 3, 2, 4, 3, 5, etc. Not an easy feat at first, because before even getting started, one has to know the base scale. Playing patterns through different keys and scale types finally is a demanding task even for advanced musicians. ScalePlay constructs patterns like these and much more complicated ones by using two simple grids. Grids have been around in music apps for years, but they are based on half-tone steps and include all available notes of the spectrum. That leaves one difficulty on the table, namely that of correctly identifying the notes of a scale. These grids also don’t easily allow for patterning as in our scale in thirds. So a different solution is called for and ScalePlay provides just that and so much more. In the application songs are used as metaphor to organize different scale types into a harmonic context. They are constructed with chords which in turn determine what scale types are available at a given time. During playback the app then cycles through these virtual chords or as with TouchPlay allows to call them up at will. This architecture is very helpful for superimposing ScalePlay patterns over existing pieces and even practicing improvising over changes. For practicing ScalePlay shows a pattern's progression on the built-in instrument and also provides a music notation reference. One can slow things down to need and play along. With the pattern lock feature all patterns can be kept in the same general vicinity. So instead of raising all scale tones when a base chord moves from C to G for example, patterns stay in place. This allows guitarists to practice scale patterns over changes while remaining in the same position. ScalePlay is also a fabulous generative music app. That is because of the magic that happens when these self-repeating scale structures are put in motion. Fantastic music occurs. Since ScalePlay supports virtual MIDI and can be recorded into any iOS based DAW. It also features TouchPlay for advanced looping. With TouchPlay scale structures can be looped endlessly and out of order. The TouchPlay environment is superimposed over ScalePlay's main interface and allows live switching between different scale types with the tap of a finger in continuous or full pattern mode. Of course ScalePlay supports multi-app multitasking as well as split-view and split-screen to make this feature even more useful. Instruments • Banjo, Bass, Cello, Double Bass, Guitar, Mandolin, Piano, Viola, Violin Some other Features: • 211 scale types • Virtual MIDI • Advanced looping with TouchPlay • Full general MIDI instrument library

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
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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

BTS FX2 screens

Verdict

The call

The clearest difference is update cadence: BTS FX at every 2 days against ScalePlay's every 3 months. BTS FX also leads on device support (3 vs 1) and iOS requirement (12.0 vs 26.0). ScalePlay's advantage is ratings volume (10 vs 3). On price, rating, ads and in-app purchases 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

ScalePlay costs $9.99 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

On the App Store both sit at effectively the same score — 4.9 for ScalePlay against 5.0 for BTS FX. Both are backed by a comparable volume of ratings — 10 and 3 respectively.

UpkeepUpdate frequency

ScalePlay ships an update every 3 months, BTS FX every 2 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
ScalePlay versus BTS FX: the parameters behind the verdict, then further details
ParameterScalePlayBTS FX
Price$9.99$9.99
Rating4.9 (10 ratings)5.0 (3 ratings) — better
Positive reviews71.4% of reviews—
Number of ratings10 — better3
Update frequencyEvery 3 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS26.012.0 — better
Further details — not scored
Size14 MB25 MB
Age rating4+4+
DeveloperRoGame SoftwareDmytro Kiro

Customer experience

ScalePlay

All ratings10 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews7 reviews
Positive71.4%
Neutral28.6%
Negative0.0%

BTS FX

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

In-app purchases

None

ScalePlay

No in-app purchases

None

BTS FX

No in-app purchases

Questions

Is ScalePlay free?
ScalePlay costs $9.99, with no in-app purchases.
Is BTS FX free?
BTS FX costs $9.99, with no in-app purchases.
Which has better reviews, ScalePlay or BTS FX?
BTS FX is rated higher. ScalePlay averages 4.9 out of 5 from 10 ratings, while BTS FX averages 5.0 from 3 ratings.
Do ScalePlay or BTS FX have ads?
Neither ScalePlay nor BTS FX shows ads.
Which is updated more often, ScalePlay or BTS FX?
ScalePlay ships an update every 3 months, and BTS FX every 2 days. Most recently, ScalePlay was updated on November 2, 2026 and BTS FX on November 3, 2026.

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