Is fragment of your voice recording too quiet? Do your audio files have different volume levels? Smart Gain can both normalize the volume level of all audio files and amplify a quietly recorded track or its fragment.

You can be sure that the file will be played at the same volume everywhere, not only in iTunes. By normalizing your files without converting them, Smart Gain allows you to retain the original quality of all your audio files.

Smart Gain automatically selects the best volume level for each file, causing all files to be played back at the same volume level. Manual adjustment of amplification offers a way to amplify quietly recorded tracks, such as a voice recording, to an appropriate level. Changes made to the amplification level are immediately reflected in the file waveform, enabling you to achieve the best result effortlessly.

You have the option to change the volume level of an entire file or its fragment. This lets you amplify quietly recorded fragments without changing the overall volume level of the file.

- Automatic Equalizer
Smart Gain allows you to equalize all of your audio files to the same volume with just a click of the mouse!

- Amplify Quiet Fragments
Amplify quiet fragments without changing the overall volume level of the file.

- Manual or Automatic - Your Choice
Smart Gain allows you to choose between automatic or manual detection of sound levels.

- Visualize the Sound
Volume levels are visually represented in waveform, so you can see the sound levels, as well as hear them.

- MP3 & AAC
Smart Gain supports both AAC and MP3 formats.

- Pre-Listening Made Easy
Smart Gain features a built-in player, making pre listening simple and easy.

- No Conversion Necessary
Equalize your audio files without having to convert them! By normalizing your files without converting them, Smart Gain allows you to retain the original quality and metadata of all your audio files.

- Undo & Redo
Undo and Redo operations are always possible to return to the previous step or repeat an operation.

What’s New

Version 1.3

Fixed issues with help

Ratings and Reviews

4.4 out of 5
15 Ratings

15 Ratings

Chad Knight ,

Best Normalizer on the market

I mean it it is super fast and it actually NORMALIZE your songs so that all play at the same level. The builtin itunes normalizer in itunes, ipod, ipads and iphone is utter crap it does not get the job done. Ive tried MP3 gain it helps a bit but mostly screw up your music. This app is totally worth it.

The only con is it fails to do great amounts at once. Probably need a super copm for that. Only load 40 songs at once.. you can try more but I advise batch it by albums or playlist and try to stay under 50 songs at once. Its a bit repetitive when your trying to do your entire library of thousands of songs but I havent found a single program that can copmpete with the speed and QUALITY of this one.

upsndowns ,

Not so smart

I missed the review that stated it doesn't do batches or I would not have purchased it. With several thousand files to normalize, Smart Gain seems not so smart. When it learns to handle batches, folders and subfolders it might turn into a handy piece of software.

Duranarts ,

Don't purchase

Does what it's supposed to but there is very little feedback or documentation on what and how to do it. A batch feature where it levels all the songs automatically would be awesome, but you won't find that here.


Denys Yevenko
1.7 MB

OS X 10.6 or later



Age Rating


  • Family Sharing

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

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