Fission

Rogue Amoeba's Mac audio editor for fast, lossless trimming, joining and converting files.

Verified facts: 3 of 3
Alternatives ranked: 4
Approved reviews: 0
Visits sent from here: 0

About Fission

Fission is a simple audio editor for macOS from Rogue Amoeba, the company behind Audio Hijack and Loopback. It is designed for quick jobs rather than production: trimming the start and end of a recording, cutting out ads from a captured stream, splitting a long file into tracks, joining clips, adjusting volume and adding fades. Its key feature is lossless editing of MP3 and AAC files, so cutting a compressed file doesn't re-encode it and degrade quality. It can also batch convert between MP3, AAC, Apple Lossless, FLAC, AIFF and WAV, and create chapterised podcast files. It pairs well with Audio Hijack for recording and cleaning up captured audio. Fission is sold as a one-off licence with a free trial, and it runs only on macOS. It has no multitrack editing, effects beyond basics, or restoration tools, so it complements rather than replaces a full editor.

Best for: Mac users who need to trim, split and convert audio files quickly without quality loss.

What works

Lossless editing of MP3 and AAC files
Fast batch conversion between common formats
Pairs well with Audio Hijack

Why people leave

Mac only
No multitrack editing or advanced effects
Paid for a fairly narrow set of tasks

Top Fission alternatives

See all 4

1
TwistedWave
More complete single-file editor for Mac, Windows and iOS.
66.5
2
ocenaudio
Free cross-platform editor for simple edits.
62.6
3
Audacity
Free open-source editor with multitrack support.
59.6
4
GarageBand
Free on every Mac for basic multitrack arranging.
57.2

Why people left Fission

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Fission: common questions

Is Fission free?

No, Fission is a paid product. Price: $35 USD (checked on Fission's own site).

Is Fission open source?

No, Fission is not open source. Open-source alternatives include Audacity.

What platforms does Fission run on?

Fission is available for macOS.

What are the best alternatives to Fission?

The highest-ranked Fission alternatives right now are TwistedWave, ocenaudio and Audacity. See the full ranked list for pricing, platforms and verified facts.

See all 4 Fission alternatives

Fission facts

3 of 3 verified

Price: $35 USD; Checked Oct 25, 2026rogueamoeba.com(opens source in a new tab); “Close Fission License Key Purchase a license key to unlock Fission for a single user on one or more Macs. $35 USD Purchase Now Local taxes may apply.”
Platform: macOS only; Checked Oct 25, 2026rogueamoeba.com(opens source in a new tab); “Please note, Fission only runs on MacOS.”
Formats: MP3, AAC, ALAC, FLAC, AIFF, WAV; Checked Oct 25, 2026rogueamoeba.com(opens source in a new tab); “Rapidly export or batch convert files to the MP3, AAC, Apple Lossless, FLAC, AIFF, and WAV formats.”