Why Defaultly?

Initially, I created it to solve a personal problem: on macOS, changing the default app for each file extension must be done manually through Get Info, Open With, Change All, with no overview and having to repeat many times.

What does Defaultly do?

• View all 400+ formats in 17 groups (documents, source code, images, audio, video, archives, fonts, 3D/CAD...)
• Change the default app for one extension, multiple extensions, or an entire group in one step
• Quick Setup: switch an entire group (for example: all Office documents) to another app
• Preview before applying, with Undo/Redo and backup/restore associations in JSON format
• Native Mac app: SwiftUI, supports Vietnamese and English
• Private: no network access, no data collection

Note when installing

The app is ad-hoc signed (not an Apple Developer ID so it is not notarized), so the first time you open it, it will be blocked by Gatekeeper. You just need to go to System Settings, Privacy & Security, Open Anyway to use it normally. This is a normal warning for apps without a Developer ID, not malware.

Download

You can download the latest version at the github release here: https://github.com/ndanhkhoi/defaultly/releases/latest