# Spatializer — Stereo widening Audio Unit

> Audio plugin for transparent stereo widening and mono compatibility. (iPhone/iPad app by quantovox.)

- Source: https://appshunter.io/ios/app/spatializer/id1574889552 (this page in markdown: same URL + `.md`)
- Developer: [quantovox](https://appshunter.io/developer/484686124)
- Category: Music, Productivity
- Price: $6.99 (on sale, was $9.99)
- Rating: 4.80/5 from 27 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.1 · 13 MB
- Languages: American English
- Released: 2021-08-05
- Data updated: 2026-08-29
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/spatializer/id1574889552/reviews.md

## What is Spatializer?

Spatializer is a great choice if you want to widen your sounds but need to avoid:
• phase smearing in the mono mix
• phasing / comb filter effects (from asymmetric channel delays)
• or any changes to the mid channel or mono mix

The plugin's main focus is to enhance sounds that have little or no side channel information, where traditional widening approaches like mid-side processing can't be effectively used. It also offers more flexibility in case of mixed inputs, widening narrow components without boosting already existing stereo width to extreme levels that would drown out the mid channel, leading to stereo image problems.

Spatializer can also be combined with other effects, for example it's excellent for augmenting large-scale reverbs by enhancing the more immediate space or effectively moving the listener closer to the virtual sound source.

At large timescales, the plugin takes on some of the qualities of a reverb itself, while keeping the mid channel sharp and free of any reflections. This could either be used as a special effect in and of itself (depending on the transient characteristics of the input), or be blended together with traditional ambience or acoustic space simulation effects.

FEATURES:
• Synthesis of side channel information where there was none (stereoization of mono sources)
• Linear phase mid channel
• Capability to deliver both a neutral / transparent response as well as stronger effects
• Built-in multiband transient shapers for delivering a more focused response by suppressing outlier reflections
• Multiple visualization options: Directional RMS distribution, position and motion
• Effects can range from close-proximity / spatial audio effects to larger acoustic space reflections
• Baseline frequency response is optimized to maximize flatness, balancing the spectral density of Left, Right, Side channels

The built-in selection of subtly tuned presets and the combined psychoacoustic properties of the above features give more leeway to easily experiment with kinds of source material that have traditionally presented difficulties, like tracks with prominent LF content.

Due to its ability to provide transparent, subtle and high-clarity responses, as well as good spectral density characteristics, Spatializer can also be included in master bus effects chains.
In multi-track setups it can be used in parallel with other positioning methods to bring more variation to the sound stage or to provide additional ways to adjust the mix.


For audio demos, visit:
www.quantovox.com/sp

PLEASE NOTE:
• AUv3-compatible host application required
• Supported sampling rates: 22.05, 44.1, 48, 96 kHz.

## Key features

- Stereo widening without phase smearing
- Synthesizes side channel information
- Preserves mid channel integrity
- Flexible for mono and stereo sources
- Transparent or strong effect options
- Multiband transient shapers
- Directional RMS distribution visualization

## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/spatializer/id1574889552/reviews.md

### 5/5 — Perfect!

*2026-08-05*

I use this plugin on my chiptune projects, especially those emulating mono systems like the NES, or any dry PSG based systems. Adds a nice subtle sense of space, as if you are listening to the music via a TV with some subtle room reflections without falling into reverb territory. Aside from chiptune it often still finds its way onto my masters. Works great, mono mix stays pristine. Occasional crashes but this could be due to my DAWs AUv3 implementation, as it happens with others too. Great app.

**Developer response:** Thank you for taking the time to describe and share the scenarios where you've found this plugin most useful. About your experiences with the DAW: if you send some specifics to our support mailbox, we can take a look.

### 3/5 — ?

*2026-03-20*

I had this for awhile and then one day it just deleted from my inventory out of nowhere. Is it not compatible anymore? I just got your 3 year anniversary pack and none of the plug ins are working either

**Developer response:** Spatializer runs on iOS 12.1 and above. There were no reductions or restrictions on app compatibility (just the opposite in fact for one the apps in the bundle). Based on the limited description, app offloading could be one explanation for what you're experiencing (if the device and user account hasn't changed).
Please get in contact with support via the e-mail address listed on the support page.
Please note that using the review system to get support is a suboptimal approach, because of the time overhead and lack of direct contact. Already, your message took 3 days to go through, and this reply will take 2-3 more days to appear as well. Plus solving complex issues often requires a conversation and sometimes log files need to be included in the exchange.
Please use the e-mail contact instead, and provide a detailed description of the issue, including the OS version and host application used.

### 5/5 — Probably great…

*2024-03-31*

It was an accidental purchase. Apple won’t let me refund immediately after. So 5 stars to the business and 1 star to Apple.

### 5/5 — ギターが壁を作り、ドラムが覚醒する

*2024-03-22*

Spatializer は直訳すると空間化装置なのだが、最もこのプラグインを表現していると思う。AUv3 には無料のステレオ化プラグインがいくつもあるが、このプラグインはそれらおもちゃとは全く違う次元にいる。ギターの壁は厚く、他のように位相がずれたり、偏ったり、真ん中が抜けたり、音質がしょぼくなったりしない。

ルームリバーブのようなモードではドラムが前に出てきて20%くらい元気になったように聴こえる。

あらゆるものにかけたくなるが、CPUも1インスタンスで2-3%持っていかれる感じなのと（ipad mini6, 32sample）、同じセッティングで録音したトラックをミックスすると干渉してしまうようなので、注意が必要ではある。

### 5/5 — Simple yet powerful

*2024-03-20*

Love it on pretty much everything

### 5/5 — Great way to add space and ambiance

*2023-12-31*

I love how controllable the spatializer is to get the result I want. It enables me to create space in the mix without creating phase issues, and has a wonderful sound and ambiance. Highly recommended!

### 5/5 — Good and useful

*2023-12-28*

This app adds a stereo effect to various sounds. It fits nicely at the end of an effects chain. This app makes things sound more satisfying. You can use it to improve your sound while playing/recording, or after recording to improve the track’s sound. It may also help in the mastering process. I consider it to be a good investment.

### 5/5 — Awesome Effect!

*2022-04-29*

I wish there was an intel Mac version.

**Developer response:** We've fitted that into our roadmap, and actually have a beta version coming up. If you'd like to participate in beta testing on intel Macs, please contact us.
UPDATE: after a number of improvements in desktop AUv3 support in multiple DAW's, there remains a major issue concerning graphics-intensive AUv3's, which made us put a hold on full-on desktop releases for plugins with more elaborate visualization features. The issue is now being raised by more developers, so hopefully a resolution may happen in the near future.

### 5/5 — Yes

*2021-08-22*

Thank you so much for your Great work

### 5/5 — Wow

*2021-08-18*

Compared to other stereo widener plugins, this is really transparent. A simple test is to play white noise (which is a component of sounds like snare drums and hi hats) and have a stereo to mono plugin at the end of the chain. All the other widener s I have cause phasing or mono compatibility issues but everything I have tried this on is fine.
It works really well to add an extra dimension to instruments and just makes everything sound and fit in better. 
Really impressive. The developer is  a genius.

## Frequently asked questions about Spatializer

### What is Spatializer used for?

Spatializer is an audio plugin designed to widen stereo sounds while preventing common issues like phase smearing and comb filtering. It's particularly effective for enhancing mono sources or adding depth to narrow stereo components without negatively impacting the mid channel.

### Does Spatializer work on mono audio?

Yes, Spatializer is excellent for stereoizing mono sources by synthesizing side channel information where none existed. This allows you to add width and depth to tracks that were originally recorded in mono.

### How does Spatializer handle phase issues?

Spatializer is specifically designed to avoid phase smearing in the mono mix and phasing or comb filter effects caused by asymmetric channel delays. It maintains a linear phase for the mid channel, ensuring mono compatibility.

### What is the price of Spatializer?

Spatializer is a paid application, available for a one-time purchase of $9.99. This grants you access to all its features for enhancing your audio.

### What devices is Spatializer compatible with?

Spatializer is compatible with iPhone, iPad, and iPod touch devices. It requires an AUv3-compatible host application to function.

### How often is Spatializer updated?

The latest version of Spatializer is 1.4.3, last updated on October 16, 2025. This indicates active development and support for the application.

### Does Spatializer have ads?

No, Spatializer does not contain advertisements. As a paid application, it offers an ad-free experience for its users.

### What are the supported sampling rates for Spatializer?

Spatializer supports multiple sampling rates, including 22.05, 44.1, 48, and 96 kHz. This flexibility allows it to integrate with various audio production workflows.

## Version history (last 5 releases)

### 1.4.3 — 2025-10-16

• Added 6 more spaces including a brand new small room and a well-balanced ultra near-field effect
• Preset navigation improvements

### 1.4.2 — 2024-07-06

• Fixed a compatibility issue with Reaper on macOS that caused discontinuities in the audio stream

### 1.4.1 — 2024-03-20

• Better response when re-enabling bypassed instances (residual audio picked up before bypassing is purged)
• Minor filtering / EQ improvements for 96 kHz mode
• Smoother continuous parameter changes for AMOUNT, BALANCE, EQ controls
• Marked the TIME SCALE parameter available for automation

### 1.4.0 — 2022-05-19

• Bugfix: restored full compatibility with iOS versions 12 and 13

### 1.3.0 — 2022-04-29

Added support for installation on Mac computers with Apple silicon (M1)

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## More apps by quantovox

- [RealPhase](https://appshunter.io/ios/app/realphase/id1588403482)
- [True Pan](https://appshunter.io/ios/app/true-pan/id6444190718)
- [Mid-Side Continuum](https://appshunter.io/ios/app/mid-side-continuum/id6465949713)
- [Ringotron](https://appshunter.io/ios/app/ringotron/id6474263444)
- [Fettkraft](https://appshunter.io/ios/app/fettkraft/id6755074522)

All apps by quantovox: https://appshunter.io/developer/484686124

## Related topics

[quantovox](https://appshunter.io/ios/topics/quantovox)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*