Fission review

Fission does a small set of jobs well: trimming, cropping, joining, fading and converting audio files on a Mac without the quality loss that re-encoding causes. Rogue Amoeba says it edits MP3 and AAC losslessly, which matters when you are cutting ads or dead air from a finished episode. Podcasters can add chapter markers to AAC and MP3 files, and Smart Split breaks long recordings into parts at silences. The batch converter exports to MP3, AAC, Apple Lossless, FLAC, AIFF and WAV. Version 2.9.5 supports macOS 14 to 27, and a $35 license covers one user on all of their personally owned Macs. Fission is not a multitrack editor and has no noise reduction or mixing, so it works best alongside a recorder such as Audio Hijack or a DAW. The trial applies limitations, so test it before buying. For quick fixes on finished files, few apps on the Mac are faster to learn.

Who it is for

podcasters who need quick lossless trims and chapters

Price

$35 one-time license for a single user on one or more Macs; free trial with limitations.

Purchase a license key to unlock Fission for a single user on one or more Macs. $35 USD
Quoted from the vendor pricing page on November 11, 2026.

Key features

• Edits MP3 and AAC without re-encoding quality loss
• Batch converts to MP3, AAC, Apple Lossless, FLAC, AIFF and WAV
• Adds chapters to AAC and MP3 podcast files
• Smart Split divides files based on silence
• Cue sheet import and export

Strengths and weaknesses

• Strength: $35 license covers one user on all of their Macs
• Strength: Pairs with Rogue Amoeba's Audio Hijack for recording
• Strength: Supports macOS 14 to 27
• Weakness: No multitrack editing or mixing
• Weakness: Trial mode applies limitations until you buy
• Weakness: Mac only

Key facts

• Price: $35 one-time
• Current version: 2.9.5 (August 13, 2026)
• macOS support: macOS 14 to 27
• Export formats: MP3, AAC, Apple Lossless, FLAC, AIFF, WAV

Where it ranks

Fission is No. 8 in our Best Audio Editing Software for Mac verdict.