Guides

Mastering on an iPhone without uploading anything

Updated 2026-09-06

Every online mastering service works the same way: you upload the track, a server processes it, you download the result. That is fine for a demo. It is a strange thing to do with a song nobody has heard yet.

What on-device means

Burnish for iPhone and iPad runs the full chain on the device's own processor. Analysis, repair, EQ, multiband compression, widening, the limiter, the loudness measurement. No network request. You can master in airplane mode. The file never leaves the phone unless you share it.

What that changes in practice

• No queue. A four minute song masters in well under a minute on a recent iPhone.
• No account, no upload limit, no file size cap tied to a plan.
• No training. There is no server to train on your audio.
• Re-mastering is free. Turn a dial, run it again, as many times as you like.

Inside GarageBand and Logic Pro for iPad

With Burnish Pro, the same engine also runs as an AUv3 plugin. Put it on the master bus of a GarageBand or Logic Pro for iPad project and hear the mastering chain live while you arrange. Genre, intensity and loudness are the three controls. Nobody else ships AI artifact repair as a mobile plugin.

What is the same as the web version

The chain, the genre profiles, and the report. The web app and the iOS app are checked against each other, so the chain and the genre profiles match. The web app exists for people without an iPhone and for a quick free check from any browser.

On the iOS app, mastering and listening are free. Saving a master is a one-time purchase, and there is no subscription. Get it on the App Store, or run a free analysis here first.