Comparison

Stereo Modulator vs SimplyTremolo

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

SimplyTremolo

Features
Read full description

A simple but straightforward tremolo audio effect to give you that nice "Crimson and Clover" feel. The controls are pretty simple and straightforward: • Rate control -- how fast to change the incoming signal • Depth -- how much to change the signal • Dry and wet mix -- amount of original (dry) and changed (wet) audio to send out • Square switch -- change amplitude abruptly instead of with smooth sine • Odd 90° switch -- affect L and R (odd) channels with orthogonal LFO signals.

Screenshots

Stereo Modulator3 screens
SimplyTremolo2 screens

Verdict

The call

The clearest difference is price: SimplyTremolo at $0.99 against Stereo Modulator's $2.99. Stereo Modulator's advantage is iOS requirement (10.0 vs 16.4). On update cadence, ads, in-app purchases 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

Stereo Modulator costs $2.99 and SimplyTremolo $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Stereo Modulator ships an update every 3 months, SimplyTremolo every 4 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard2 real differences · 8 level
Stereo Modulator versus SimplyTremolo: the parameters behind the verdict, then further details
ParameterStereo ModulatorSimplyTremolo
Price$2.99$0.99 — better
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 3 months — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS10.0 — better16.4
Further details — not scored
Size2 MB6 MB
Age rating4+4+
DeveloperBlue Mangoo Consulting Company LimitedBrad Howes

In-app purchases

None

Stereo Modulator

No in-app purchases

None

SimplyTremolo

No in-app purchases

Questions

Is Stereo Modulator free?
Stereo Modulator costs $2.99, with no in-app purchases.
Is SimplyTremolo free?
SimplyTremolo costs $0.99, with no in-app purchases.
Do Stereo Modulator or SimplyTremolo have ads?
Neither Stereo Modulator nor SimplyTremolo shows ads.
Which is updated more often, Stereo Modulator or SimplyTremolo?
Stereo Modulator ships an update every 3 months, and SimplyTremolo every 4 months. Most recently, Stereo Modulator was updated on November 2, 2026 and SimplyTremolo on November 3, 2026.

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