Comparison

Krill Synthesizer 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

Krill Synthesizer

This virtual analog polyphonic synthesizer offers a streamlined interface for creating quick synth sounds on iPad. It features two oscillators, an LFO, a low-pass filter, two envelopes, and stereo effects, all accessible from a single screen.

Highlights
  • Virtual analog polyphonic synthesizer
  • Single-screen interface
  • Two oscillators
  • One LFO
  • Low-pass filter
  • Stereo chorus and ping-pong delay
  • 64 presets
Features
Read full description

The GSi Krill Synthesizer was born from a design originally conceived to work as a mono synthesizer on an embedded processor (RP2040), then it was modified to be polyphonic for a more powerful processor (ARM H7) and finally we thought it would be perfect as a AUv3 for iPad, for those quick and dirty synth sounds you sometimes need without getting lost in endless parameter navigation and menu diving. So here it is, just one screen, one knob - one function, what you see is what you get. Two oscillators, one LFO, one low pass filter, two envelopes, stereo chorus, ping-pong delay, 64 presets. Have fun!

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

Krill Synthesizer1 screens
BTS FX2 screens

Verdict

The call

The clearest difference is update cadence: BTS FX at every 2 days against Krill Synthesizer's weekly. BTS FX also leads on price ($9.99 vs $11.99). On rating, ratings volume, 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

Krill Synthesizer costs $11.99 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 — 5.0 for Krill Synthesizer against 5.0 for BTS FX. Both are backed by a comparable volume of ratings — 6 and 3 respectively.

UpkeepUpdate frequency

Krill Synthesizer ships an update weekly, BTS FX every 2 days. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
Krill Synthesizer versus BTS FX: the parameters behind the verdict, then further details
ParameterKrill SynthesizerBTS FX
Price$11.99$9.99 — better
Rating5.0 (6 ratings)5.0 (3 ratings)
Positive reviews100.0% of reviews—
Number of ratings6 — better3
Update frequencyWeeklyEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size8 MB25 MB
Age rating4+4+
DeveloperGenuine SoundwareDmytro Kiro

Customer experience

Krill Synthesizer

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

BTS FX

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

In-app purchases

None

Krill Synthesizer

No in-app purchases

None

BTS FX

No in-app purchases

Questions

Is Krill Synthesizer free?
Krill Synthesizer costs $11.99, with no in-app purchases.
Is BTS FX free?
BTS FX costs $9.99, with no in-app purchases.
Which has better reviews, Krill Synthesizer or BTS FX?
Krill Synthesizer and BTS FX are both rated 5.0 out of 5 on the App Store, from 6 and 3 ratings respectively.
Do Krill Synthesizer or BTS FX have ads?
Neither Krill Synthesizer nor BTS FX shows ads.
Which is updated more often, Krill Synthesizer or BTS FX?
Krill Synthesizer ships an update weekly, and BTS FX every 2 days. Most recently, Krill Synthesizer was updated on November 3, 2026 and BTS FX on October 25, 2026.

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