Comparison

Stereo Modulator vs TfxReverb

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

Head to head
About

Stereo Modulator

This audio effect plugin transforms mono sound into stereo, adding width and depth. It uses micro-delays to create a natural sense of space, with optional LFO modulation for a Leslie speaker-like effect without pitch shifting. Ideal for creating separation in mixes, especially for guitars and vocals.

Highlights
  • Mono to stereo conversion
  • Adjustable stereo width
  • Optional LFO modulation
  • Micro-delay de-correlators
  • Creates natural spatial depth
  • No pitch shifting or echo
Features
Read full description

Stereo Modulator is an AU3 effect that converts mono sound into stereo, with an adjustable width and optional LFO modulation. It works by using a bank of randomized stereo de-correlators that apply micro-delays to introduce random differences between the spectrums of the left and right audio channels. In its output we hear a natural sense of space that is not present in mono recordings. It's similar to the sound space one gets from using a stereo reverb plugin except that it is tight and clear, without echo. It can operate either as a static effect or it can be gently modulated by a low-frequency oscillator. The modulation is akin to the sound of a Leslie speaker, except that it doesn't do any pitch shifting, so the output remains focused and tuning is not compromised. This effect is especially useful for mixing overdriven electric guitar sounds together with vocals. Using Stereo Modulator on the guitars, we can push them out to the sides, creating a space in the centre for the vocal to cut through, without needing to reduce the volume of the guitars. NOTE: Stereo Modulator is an AU3 plugin only, not a standalone app. To use it, you will need an audio unit host app such as Garageband or Audiobus.

About

TfxReverb

This audio plugin generates digital reverb effects using a unique algorithm. It offers simple operation with an auto-size mode that adjusts parameters with a single dial, and features delay lines inspired by vintage bucket brigade devices for creative pitch-shifting.

Highlights
  • AudioUnit Extension plugin
  • BBD-inspired delay lines
  • Adjustable input filters
  • LFO modulation
  • Tempo sync
  • Auto size mode
Features
Read full description

TfxReverb is a reverb effect AudioUnit Extension plugin. It uses algorithm to generate digital reverb sound. TfxReverb is designed for simple and easy operation. When auto size mode is enabled, number of parameters can be controlled by a single dial to adjust size of the reverb sound, which can be synced to tempo. It features delay lines which are inspired by BBD (bucket brigade device). 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 unit. Features AudioUnit Extension - Input lowpass filter: From 1KHz to 20KHz - Input high-pass filter: From 20Hz to 500Hz - LFO Frequency: From 0.01Hz to 10Hz - LFO Intensity: From 0.0 to 1.0 - Pre Delay: From 1ms to 100ms - Size: From 0% to 100% - Auto size mode: On / Off - Decay: From 0% to 100% - Damp: From 0% to 100% - Output Lowpass Filter: From 1KHz to 20KHz - Early/Late Mix: From 0% to 100% - Dry/Wet Mix: From 0% to 100% - Tempo Sync: On / Off - Tempo (manual) : From 1bpm to 999bpm - Effect Switch: On / Off Host Application Host application uses system audio input as an audio source and processed audio signal is routed to the system audio output.

Screenshots

Stereo Modulator3 screens
TfxReverb4 screens

Verdict

The call

The clearest difference is rating: Stereo Modulator at 5.0 against TfxReverb's 4.5. Stereo Modulator also leads on review sentiment (100% vs 75%) and update cadence (every 3 months vs every 10 months). TfxReverb's advantage is price ($1.99 vs $2.99). 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

Stereo Modulator costs $2.99 and TfxReverb $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Stereo Modulator holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 3 and 8 respectively. Written reviews point the same way: 100% of Stereo Modulator's written reviews are positive against 75% of TfxReverb's.

UpkeepUpdate frequency

Stereo Modulator ships an update every 3 months, TfxReverb every 10 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

Scorecard5 real differences · 5 level
Stereo Modulator versus TfxReverb: the parameters behind the verdict, then further details
ParameterStereo ModulatorTfxReverb
Price$2.99$1.99 — better
Rating5.0 (3 ratings) — better4.5 (8 ratings)
Positive reviews100.0% of reviews — better75.0% of reviews
Number of ratings38 — better
Update frequencyEvery 3 months — betterEvery 10 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better13.6
Further details — not scored
Size2 MB2 MB
Age rating4+4+
DeveloperBlue Mangoo Consulting Company LimitedRyo Togawa

Customer experience

Stereo Modulator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

TfxReverb

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

None

Stereo Modulator

No in-app purchases

None

TfxReverb

No in-app purchases

Questions

Is Stereo Modulator free?
Stereo Modulator costs $2.99, with no in-app purchases.
Is TfxReverb free?
TfxReverb costs $1.99, with no in-app purchases.
Which has better reviews, Stereo Modulator or TfxReverb?
Stereo Modulator is rated higher. Stereo Modulator averages 5.0 out of 5 from 3 ratings, while TfxReverb averages 4.5 from 8 ratings.
Do Stereo Modulator or TfxReverb have ads?
Neither Stereo Modulator nor TfxReverb shows ads.
Which is updated more often, Stereo Modulator or TfxReverb?
Stereo Modulator ships an update every 3 months, and TfxReverb every 10 months. Most recently, Stereo Modulator was updated on October 24, 2026 and TfxReverb on October 27, 2026.

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