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.

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.

Makes transient processing a bit smoother.

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

Reduces low frequencies.

Compensates high frequencies by boosting them.

Mixes between dry and noise reduced signal.

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 1.2.0

Updated AUv3 user interface.
New gain control.
Minor processing bugs fixed.
Performance improvements.

Ratings and Reviews

3.7 out of 5
55 Ratings

55 Ratings

Muuuuuussssiiic ,

Amazing abilities, but a bit glitchy

First app I’ve found that does such a good job isolating the background noise that I was trying to remove. Very powerful ability. Nice design too. Unfortunately it is quite glitchy with importing files, only plays them about half the time on the first try so you have to try another time or too and then it works. (On Ipad 4) The dials on the filters feature took a few minutes to figure out too, the dials appears to control by spinning, but are actually controlled by swiping up and down, minor issue, but a bit of a confusing design. Some updates to make it work a little smoother would be appreciated. Overall very happy with the app though, great work! ,

Only Great Experiences

Maybe the negative reviews are from people trying to process audio in standalone mode? For my workflow which involves using Brusfri as an AUv3 on all of my vocals, recorded in GarageBand & Cubasis using the built in mic, Brusfri has been an invaluable resource. It has run perfectly on the XS Max, 11 Pro Max, and will probably run as well on the 12 Pro Max once I start recording again. I can't imagine working without this app.

I usually set my noise floor *before* recording so that it sounds most natural [as it's less prone to quiet my breathing]. But it usually works just well when applied after recording. You'll want to add at least a little reverb in either case & then it's lovely.

I really pray that Klevgrand brings more apps to iPhone because they offer amazing tools. There's no other noise gate as intuitive or simple to use.

aaronre77 ,

Not perfect, but dang good.

This apps works well on light background sounds. The kind that annoy you because it’s something you can’t help. Like white and pink noise, background chatter in a restaurant, certain kinds of mechanical noises. In some cases it nearly eliminates all of it and in others it helps cut the noise but not silent it. I tried using it on an interview at a Starbucks on a busy Blvd. We sat outside on a patio. I had used a lav mic but Brusfri could not even touch the sound of traffic and I had given the app a minute of sound sample to work with. This app is good but it’s not a miracle worker.

App Privacy

The developer, Klevgränd produkter AB, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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