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Shortcast for Mac

Turns long videos into ready-to-post TikTok, Instagram Reels, and YouTube Shorts with automatic finding, cutting, captions, reframing, and scheduling.

By mutonby. Free and open source, Apache-2.0 licence.

Get it with OpenDMG View source on GitHub

Shortcast at a glance

Version
1.0.0
Released
3 June 2026
Download size
13 MB
Works on
Apple silicon and Intel
Licence
Apache-2.0
Category
Artificial Intelligence
Developer
mutonby
GitHub stars
389

About Shortcast

Native macOS app: drop a long video → auto-cut viral shorts, captioned for TikTok/Reels/YouTube, reframed to vertical, and scheduled. 100% on-device (Gemma 4 12B + WhisperKit + MLX).

Screenshots

Shortcast screenshot 1

How to install Shortcast on a Mac

  1. Get OpenDMG. It is a free app store for open source Mac apps. Download OpenDMG.
  2. Search for Shortcast and press Get. OpenDMG downloads version 1.0.0 from mutonby's own GitHub release.
  3. Open it. The download is checked against its SHA-256 fingerprint and its signature is checked on your Mac before it lands in Applications.

Updates to Shortcast show up in OpenDMG and install with one button. No account is needed.

Prefer to do it by hand? The developer's file is on GitHub: Shortcast.dmg (13 MB).

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