Brusfri 4+

Noise reduction tool

Klevgränd produkter AB

    • 3.8 • 65 Ratings
    • $8.99



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 1.2.1

- AUv3 state save/restore bug fixed.
- Fixed an issue where a couple of user interface components wouldn’t always react on automation changes.
- "Export" replaced "save" and "open in" buttons.
- Minor graphical tweaks.

Ratings and Reviews

3.8 out of 5
65 Ratings

65 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!

Abandoned Shell ,

Wondrous Wiizardry

This audio unit is nothing short of amazing. It pretty much does the work for you, but is still tweakable to get things sounding clean and clear and just right. I have used this plug on my first ever single to be officially released at the beginning of 2023 to clean up some very messy vocal samples. These were recorded with my iPad’s built in microphone one night when I just laid my iPad out and recorded dialogue between some friends and I. The dialog was faint, hardly audible and filled with hiss and static, but this ething cleaned it up so impressively and made such poorly recorded bits and pieces usable enough for my first commercial release. I’ve tried many limiters, compressors, EQs, deessers, sonic maximizers, other vocal cleanup plugs, etc., etc., but this plug has by far been the best I’ve come across for cleaning up poorly recorded vocals. If you want to clean up audio recorded with your iPhone or ipad’s microphone, get this audio unit, it works surprisingly well and I can’t imagine you’ll be disappointed.

(I don’t get the one star reviews, all I can imagine is these people are just a tad incompetent, or their devices are bogged down with too much trash. I dunno, but it works perfectly fine on my ancient iPad Air, as well as my 2018 iPad Pro, and my 2021 iPad Pro. I use it as a plug-in with apps such as Cubasis, and NanoStudio 2 and have never had a problem.)

JoselynMartin ,

Saved My Podcast Recording

I have tried so many things to clean up background noise when recording with a remote guest, and this is the only thing that has ever really worked. I did not have any problem with glitching. I edit audio recordings through GarageBand on my Mac, so I had to do some back-and-forth between my computer and my phone, but that wasn’t a big deal at all especially when you have an iCloud Drive (just export the vocals as a wag or mp3 to open in the app). One thing I will say that made a difference is running the vocals through your regular filters before exporting it and running it through this app; putting just a noise gate on the recording both before and after you run it through this app makes a really big difference. I hope it works just as well for you. Good luck!

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

    Up to six family members can use this app with Family Sharing enabled.

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