TfxEcho vs isxynth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TfxEcho
This audio plugin offers a warm, dark echo effect inspired by analog delay units. It allows for adjustable delay times, feedback, and filters, with modulation capabilities and tempo syncing. The plugin captures high-frequency signals for a versatile sound.
- Echo and delay effect
- BBD-inspired delay lines
- Adjustable delay time (20-1200 ms)
- Feedback control (0-100%)
- Low-pass and high-pass filters
- Modulation rate and width
- Tempo sync
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TfxEcho is an echo effect AudioUnit Extension plugin. It uses delay lines which are inspired by BBD (bucket brigade device). BBD is used in various analog delay unit and is known for its warm and dark sound. The delay line uses fixed length buffer and an artificial clock to sample input signal in variable sampling rate. When the delay time is changed, the delay line can produce pitch change effect which is similar to the behavior of the BBD based analog delay unit. The delay line is inspired by BBD, but it is not emulation of the any particular BBD. Unlike the typical BBD based delay unit, frequency range of the delay line is not limited. The delay line is capable to capture signal in higher frequency up to about 22KHz. Features AudioUnit Extension - Delay Time: From 20 ms to 1200 ms - Feedback: From 0 % to 100 % - Adjustable lowpass filter and high-pass filter. - Modulation rate: From 0.01 Hz to 10 Hz - Modulation width: From 0 ms to +/- 10 ms - Delay time can be synced to tempo provided by the host application. Host Application Host application uses system audio input as an audio source and processed audio signal is routed to the system audio output.
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.
- 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
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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
Verdict
The clearest difference is rating: TfxEcho at 4.7 against isxynth's 3.7. TfxEcho also leads on update cadence (every 3 months vs every 34 months) and price ($4.99 vs $7.99). isxynth's advantage is review sentiment (100% vs 80%) and iOS requirement (11.0 vs 13.5). 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
TfxEcho costs $4.99 and isxynth $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
TfxEcho holds the better App Store score, 4.7 against 3.7. Both are backed by a comparable volume of ratings — 12 and 3 respectively. Written reviews complicate that: 80% of TfxEcho'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.
TfxEcho ships an update every 3 months, isxynth every 34 months. The most recent releases landed on September 20, 2026 and September 24, 2026 respectively.
| Parameter | TfxEcho | isxynth |
|---|---|---|
| Price | $4.99 — better | $7.99 |
| Rating | 4.7 (12 ratings) — better | 3.7 (3 ratings) |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 12 — better | 3 |
| Update frequency | Every 3 months — better | Every 34 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #185 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.5 | 11.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryo Togawa | Alexey Nadzharov |
Customer experience
TfxEcho
isxynth
In-app purchases
TfxEcho
No in-app purchases
isxynth
No in-app purchases
