Brusfri

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.

Category	Price	Seller	Device
Music	$8.99	Klevgrand Produkter AB	iPhone, iPad, iPod

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

Usage

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.

Standalone
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.

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

HPF
Reduces low frequencies.

HIGH
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.

Reviews

iOS 13 crippled Brusfri
dataBANG

Brusfri was useful until it became less interoperable with some workflows... it no longer is an available option when sharing your audio to another app. Hard to explain but have faith the developers will update because there is value in this plug when the versatile workflows are working.

Consistently amazing!
a e r o c

Innovative and well coded is the name of the game Great work. Thank you!

Amazing
AmandaPBerry

Using it with Ferrite for VO and podcasting. Really does an amazing job.

Essential
doug funnie

I've loved all of Klevgrand's iOS stuff for years now, and this is their best release yet. Its utility value is off the charts if you are working with external gear or recording in a less-than-ideal environment.

You record live instruments / music - must have
Chrome574

Wow. No brainer. If you are reading this review you need this. I use it on recordings from my noisy tube amp. Or that time I recorded the band with one mic.

Does exactly what it says on the tin
RedSkyy73

This app is superb, does exactly what it is supposed to simply and well and with enough controls to fine tune to what you need. User interface is perfect

Incredible
Pangoat

I think most noise reduction algorithms make audio sound like a bad over compressed mp3 but this sounds terrific. I'm really floored. Ambient noise gone and I can still hear quality and high tones. Bravo

Good.test more IAA compatibility
DCFallbrook

Great app.if you import a file. Bought it hoping it would work as an IAA without having to use Audiobus Doesn’t work with Harmonicdog Multitrack DAW, which is my go-to. Works in AUM, Audiobus.. IAA is so hit and miss these days, so only way to see if it will work with your “go-to” app is to buy it first..I’ll put this down on the list of the other 10 effects apps I have bought that don’t work.. looking forward to next update

Holy freaking crap
Brett G.

Entirely, surprisingly, effectively useful as advertised. I was frustrated at $15, and then I tried it. Worth every penny.

Disappointed!
JosephPro_1212

I am writing this review because it needs one for how frustrating it is to use this app. I have spent money on hoping it will help me clean up my audio for important uses with my school. The reason this app makes me so angry is I spent money trusting this will help and it did not, every time I try to import an audio from a video the app crashes. I try over an over to import and it never fails to crash. This is really frustrating when you're trying to do work. PLEASE DO NOT BUY THIS APP, IT IS NOT WORTH THE MONEY ON GETTING AN APP THAT IS NOT RELIABLE!