Comparison

Classic FX vs isxynth

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

Head to head
About

Classic FX

Enhance audio with a comprehensive sound effects processor. It offers equalization, reverb, and unique morphing capabilities to add brightness and expand soundscapes for instruments, vocals, and drums. Experiment with diverse effects and dynamic transitions for creative sound design.

Highlights
  • 22 unique processing algorithms
  • 40 diverse presets
  • Morphing between effect slots
  • Three-band equalizer
  • Algorithmic reverb
  • Envelope follower
  • Sequencer for rhythmic control
Features
Read full description

Classic FX is a complete sound effects processor and a mono-to-stereo enhancer with equalizer, effects and reverb, based on specially designed high-quality processing algorithms and suitable for any kind of audio sources. This application will add brightness and expand the sound space of any musical instruments, synthesizers, drums or voice. Unique and diverse effects with unified control parameters provide convenience and ease of customization, while at the same time plenty of room for individual expression and experimentation. Another unique feature of Classic FX is the Morphing option, based on complex effects matrix transformations, which allows you to control the dynamic transition between any two presets. While this can produce stunning effects, it's a breeze to control - you just need to move a fader or push a button. For more morph experimentation, this app has three LFOs to create more complex waveforms for changing morphs. Each LFO has different ranges, waveforms and can sync to the external BPM. Some of the other features of Classic FX: - Classic FX has 22 unique processing algorithms and 40 different presets. - Two slots in which you can use different effects and smoothly morph between them. - Three band equalizer with high / low shelving filters and middle peaking filter. - Easy to use algorithmic reverb, suitable for any sound source. - Limiter on output prevents any possible clipping. - Envelope follower for dynamic control of each effect. - Sequencer for rhythmic control of each effect. - Three special LFO in series to automate morphing. - Hot buttons to change the active effect slot. - Changing a group of parameters at the same time. - Echo module, Sequencer, and Auto morphing synced with the main BPM source. - The effect algorithm and its parameters can be saved as a preset. - Detailed application description and description of algorithms. - Quick info and description of each algorithm used in presets. Classic FX is a universal application for iOS and macOS. It can work on iPhone and iPad as well as Mac / MacBook with M1 chip (and later). Classic FX works on iPhone and iPad standalone, as an Audio Unit or Inter-App Audio module, and supports Audiobus and Ableton Link. On MacOS, Classic FX can works both as a standalone application and as an Audio unit (AUv3) with DAWs and audio unit hosts like Ableton Live, Logic Pro, GarageBand, MainStage, Cockos Reaper, Plogue Bidule, Hosting AU, and other hosts that support AUv3 plugins. All application features are available on iOS and macOS. Presets demo: https://www.youtube.com/watch?v=qyiKOAM7pjQ https://www.youtube.com/watch?v=6h6Or3OTCsY https://www.youtube.com/watch?v=qXoxGmrXJVk You can find more information on Classic FX and other experimental audio processing apps at: https://motion-soundscape.blogspot.com

About

isxynth

This music effect plugin allows spectral cross synthesis and morphing between two input signals. It separates noise and tone components, offering controls for blending, freezing, and time-based delays. Gestures on controls can be recorded and played back for dynamic sound shaping.

Highlights
  • Spectral cross synthesis
  • Morphing between two input signals
  • Noise and tone component blending
  • Freeze control for spectral blurring
  • 3-second delay lines per input
  • Gesture recording and playback
Features
Read full description

isxysnth is spectral cross synthesis / morphing plugin it gets two input signals, splits each one into 2 parts containing noise and tone components and then allows morphing between all these elements. Freeze control allows spectral blurring-like effect for both input signals, two 3 second delay lines allow selection of different signal in time and also provide "freeze" effect you can process left and right channels on stereo source or use this effect as multi-input AUv3 - in that case it will use 2 stereo inputs. Standalone mode currently works only in "mono" mode - three XY controls set balance between tone and noise components, amount of freeze and set up morphing - both inputs have 3-second delay line; freeze button ("*") toggles off recording. - gestures on all the main controls (3 xy pads and two sliders) can be recorded and played back when appropriate button with ">" label is toggled on - in current version standalone app supports only mono (L + R as inputs I and II) processing

Screenshots

Classic FX4 screens
isxynth3 screens

Verdict

The call

The clearest difference is rating: Classic FX at 4.6 against isxynth's 3.7. Classic FX also leads on update cadence (every 2 months vs every 34 months) and ratings volume (22 vs 3). isxynth's advantage is price ($7.99 vs $12.99) and review sentiment (100% vs 87%). On ads, in-app purchases, monetization model and device support 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

Classic FX costs $12.99 and isxynth $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Classic FX holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: Classic FX has 22 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 87% of Classic FX's written reviews are positive against 100% of isxynth's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Classic FX ships an update every 2 months, isxynth every 34 months. The most recent releases landed on October 9, 2026 and October 2, 2026 respectively.

Scorecard6 real differences · 4 level
Classic FX versus isxynth: the parameters behind the verdict, then further details
ParameterClassic FXisxynth
Price$12.99$7.99 — better
Rating4.6 (22 ratings) — better3.7 (3 ratings)
Positive reviews86.7% of reviews100.0% of reviews — better
Number of ratings22 — better3
Update frequencyEvery 2 months — betterEvery 34 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.411.0 — better
Further details — not scored
Size12 MB8 MB
Age rating4+4+
DeveloperIgor VasilievAlexey Nadzharov

Customer experience

Classic FX

All ratings22 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews15 reviews
Positive86.7%
Neutral0.0%
Negative13.3%

isxynth

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Classic FX

No in-app purchases

None

isxynth

No in-app purchases

Questions

Is Classic FX free?
Classic FX costs $12.99, with no in-app purchases.
Is isxynth free?
isxynth costs $7.99, with no in-app purchases.
Which has better reviews, Classic FX or isxynth?
Classic FX is rated higher. Classic FX averages 4.6 out of 5 from 22 ratings, while isxynth averages 3.7 from 3 ratings.
Do Classic FX or isxynth have ads?
Neither Classic FX nor isxynth shows ads.
Which is updated more often, Classic FX or isxynth?
Classic FX ships an update every 2 months, and isxynth every 34 months. Most recently, Classic FX was updated on October 9, 2026 and isxynth on October 2, 2026.

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