Alien Box vs Stereo Modulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Alien Box
This audio effect plugin creates a unique sound with increased sustain and gentle, LFO-modulated vibes. It functions as an AUv3 effect for hosts like GarageBand or as a standalone app for real-time audio input processing.
- Unique sound enrichment
- LFO modulated vibes
- Complex resonator system
- AUv3 plugin for hosts
- Standalone app mode
- Gain, Vibe, Depth, Reverb controls
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Alien Box is a completely new kind of audio effect that you have never heard before. It makes the sound big and slightly increases the sustain while adding gentle vibes to it. The vibes are LFO modulated and the effect is using very complex resonator system inside. It is modulation effect and you can compare it to flanger, phaser or chorus but it is not like any of them… The app is an Audio Unit Effect AUV3 and can be used inside GarageBand or other AU host apps as an effect plug-in. Alien Box can also run as a stand alone app adding effect to the audio input so you can play your guitar, bass or synth directly three the app if you have the connector to do so. Alien Box controls: - Gain - you can use it increase the gain and sustain - Vibe - main tone and background vibes balance - Depth - controls the modulations depth - Reverb - adds reverb to the background vibes
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.
- Mono to stereo conversion
- Adjustable stereo width
- Optional LFO modulation
- Micro-delay de-correlators
- Creates natural spatial depth
- No pitch shifting or echo
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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.
Screenshots
Verdict
The clearest difference is review sentiment: Stereo Modulator at 100% against Alien Box's 0%. Stereo Modulator also leads on rating (5.0 vs 1.3) and update cadence (every 3 months vs every 38 months). On price, 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
Alien Box costs $2.99 and Stereo Modulator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Stereo Modulator holds the better App Store score, 5.0 against 1.3. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews point the same way: 0% of Alien Box's written reviews are positive against 100% of Stereo Modulator's.
Alien Box ships an update every 38 months, Stereo Modulator every 3 months. The most recent releases landed on August 14, 2026 and August 30, 2026 respectively.
| Parameter | Alien Box | Stereo Modulator |
|---|---|---|
| Price | $2.99 | $2.99 |
| Rating | 1.3 (3 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 | 3 |
| Update frequency | Every 38 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 | 10.0 |
| Further details — not scored | ||
| Size | 10 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Aleksandar Mlazev | Blue Mangoo Consulting Company Limited |
Customer experience
Alien Box
Stereo Modulator
In-app purchases
Alien Box
No in-app purchases
Stereo Modulator
No in-app purchases








