4U+ BlindTest

The HOFA 4U+ BlindTest allows you to objectively compare equipment (e.g. plugins) inside your DAW. Only if you compare objectively, will you get the best sounding result.


Only 39,90 

We often get distracted by appearance or names: we think we hear differences that do not exist – simply beacuse of the connection between visual and auditory perceptions. Therefore, we unconsciously often compare the expectations we have of a product, rather than the actual sound character.

In order to avoid this problem, we have developed a reliable blind test, so you can concentrate on what is important: the sound!

4U BlindTest


By loading the video, you accept the YouTube privacy policy.
Learn more

Load video

This helpful tool was created to help us develop the best plugins. We needed a way to compare our software objectively against the most popular competitor products.
Simply insert 4U+ BlindTest as the last plugin on every track that you want to compare. The track that is SOLO’d in 4U+ BlindTest will play. All other tracks are muted.

4U BlindTest Shuffle

The Shuffle-Button

Click on “Shuffle” to anonymise the tracks and put them in a random order. Now you can switch between the signals to compare them objectively. Assign a rating from 0 to 5 and write down comments about your aural impression. The names of the tracks can then be revealed again.

You can use the shuffle mode multiple times. This way you an average, creating your personal sound study. The comments can be displayed together, so you can compare whether your aural impressions were the same every time.

To make sure that the results are really objective…

… there is a peak level display and a gain control for every track, so you can make sure the volume differences do not influence your decisions.

… the GUI is freely scalable, so that you can use it to hide anything on your screen that may influence your decisions like your DAW’s mix window.

4U BlindTest Detail

You might not want to compare all tracks at once. Simply drag unused tracks to the “INACTIVE” section. This can be used to sort out tracks during a test run.

Info: Click here to download the manual.

Download: Click here to download the installer.

HOFA 4U+ BlindTest is free. You can compare up to 3 tracks.
The HOFA 4U+ BlindTest upgrade for unlimited tracks can be purchased for 39,90 €.

Download & Test
Only 39,90 

>> Save big with the HOFA-Plugins bundles!

User feedback & press reviews:

Clever integration, easy to use and great additional features: this tool is great for objective comparisons of tracks and plugins.


The coolest freeware utility plugin this year was 4U Blind Test, an incredibly useful tool to have around …

read the full review here

People that have more than one plugin for each task and really want to get to know their tools can use the HOFA 4U+ BlindTest to compare their plugins. It’s a must have!


Professional Audio

We are really excited about the BlindTest plugin, because it fits perfectly in our day-to-day routine. Audio engineers that tend to lack decisiveness or who have often made their decisions because of the bling bling factor of a plugin, will find that the HOFA 4U+ BlindTest is a useful helper. It’s a simple and efficient possibility for quality control. Thumbs up!

professional audio