Brusfri* is a highly advanced audio noise reducer, packed into a simple and straight-forward interface. It is very well suited for cleaning up noisy audio recordings, while retaining sound quality. Unlike many other noise reducers on the market, Brusfri doesn't mess with audio phasing to suppress noise (a technique that often comes with audible side effects). Instead, multiple fine-tuned gates are used to silence unwanted noise.

Brusfri can also be used as a AUv3 plug-in in compatible hosts, for example in GarageBand.

*Brusfri means "Noise free" in Swedish.

Here are some examples of sound conditions that Brusfri handles well:

* Guitar amp
* Noisy vintage gear
* Boosted pre-amp
* iPhone/iPad and external mic hiss
* Room reverb removal
* Fan noise
* Background ambiance
* Mains hum / Electric hum


In short, press “Learn” during a couple of seconds of isolated noise to create a "profile" for noise. This may be all you need to do.

Brusfri can be used in two ways, either standalone or as a AUv3 plug-in.

Import the audio, either by extracting audio from a video, by importing from iTunes, or by using the “Open In…” option in any other app that can export audio. Press and hold the Learn button (the ear) while playing unwanted noise. (It’s important that the Ear is only fed with isolated noise). When Learn is released, Brusfri will start reducing noise. On iPhones, you need to swipe left on the Ear to reveal the Expander functions, or swipe right for Filters.

AUv3 plug-in
Open Brusfri in any AUv3 compatible host.
Find a region in the recording that only contains noise and play it.
Tap and hold the “LEARN” button for a short while (a second will be enough). When the LEARN button is released, Brusfri will start reducing noise.

There are a bunch of parameters available that affect the noise reduction algorithm:

ATK / THRS / REL (Attack Time / Threshold / Release Time)
Threshold - basically determines how much noise to be removed. A lower value means more reduction.
Attack and Release sets the time it will take for the reducer to start working.

Controls the reduction aggressivity. A lower value gives a smoother reduction.

Reduces low frequencies.

Compensates high frequencies by boosting them.

NOTE! Brusfri is CPU intensive and iPhone 6 / iPad AIR 2 or better is recommended. When used as an AUv3 plug-in, we highly recommend freezing/bouncing tracks to reduce CPU usage.

What’s New

Version 1.1.0

The standalone version now can import, process and export audio.

Ratings and Reviews

4.1 out of 5
25 Ratings

25 Ratings

A typing monkey ,

Great for shorter clips

I bought this a while back and refunded it because it crashes when working long clips. I haven’t been able to find anything decent for background audio noise reduction, so I decided to try this app again on shorter clips. I used it on a 5:30 4K clip and IT WORKS BEAUTIFLY!!! I honestly am shocked with how well the clip sounds after removing the background noise. This app is ABSOLUTELY AMAZING when you work with smaller clips. I really hope it gets updated to address the issues, but as of now I have to say it is worth the price even with the bugs because of how great it works when it works. I know that sounds crazy, but I looked for a long time to find something else, and now I know this is the best.

AldrichZurcher ,


Works beautifully, so easy to use and brings forth stunning results! Takes out the noise and leaves behind the natural audio- the way it’s supposed to be.

yamalon ,

Didn't want to write this

At the time of writing this, there are 20 reviews for this app, including mine, and 5 of them are 1 star reviews. That's 25% for those of us who are counting.

This seems like a great app if you're lucky enough to have a device that it works properly on. Doesn't work on mine though, like at all. Doesn't work in Audiobus as a plugin, doesn't work in standalone mode when I import sounds. Pretty much the same complaint as the other 4 guys.

So if you're considering buying this app, good luck. There's at least a 25% chance that you're about to waste $15.


Klevgrand Produkter AB
38.3 MB

Requires iOS 9.1 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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