ODM (Open Source Download Manager): A Free IDM Alternative for macOS

ODM (Open Source Download Manager) is a completely free, open-source download manager for macOS. Windows users who switch to Mac often miss one thing the most: a fast, reliable download manager. I built ODM to fill that gap.

Mac's built-in browser typically downloads a file using a single connection. If your internet connection drops, you may sometimes have to restart the entire download. ODM splits a file into multiple segments and downloads them simultaneously. If a download is interrupted, it can resume right where it left off.

Download Link: github.com/niruvai/odm/releases/latest

What ODM Offers

Feature	What It Does
Multi-Connection Downloads	Downloads a single file using up to 8 simultaneous connections by default (adjustable from 1 to 32).
Dynamic Segmentation	When one connection finishes early, it takes over remaining segments, helping maintain download speeds until completion.
Pause / Resume	Resume downloads from where they stopped, even after an internet disconnection or closing the app.
Download Progress Window	A separate window for each download, similar to IDM, showing speed, time remaining, and the progress of individual connections.
Chrome Extension	Automatically sends browser downloads to ODM. Also works with Edge and Brave.
Video Downloads	An ODM button appears on video pages, allowing downloads up to 1080p or audio-only.
Organized Folders	Automatically sorts videos, music, software, and documents into separate folders.
Automatic Updates	Displays an "Update Now" option in the app when a new version is available.

ODM also includes a menu bar icon, displays the number of active downloads in the Dock, and prevents your Mac from going to sleep while downloads are running.

How to Install ODM

ODM requires macOS 13 (Ventura) or later. It works on both Apple Silicon and Intel Macs.

Download ODM.zip from the latest release.
Extract the ZIP file and drag ODM.app into your Applications folder.
Open ODM. The first time you launch it, macOS may say that the developer cannot be verified. If this happens, go to System Settings → Privacy & Security and scroll down to click Open Anyway.

ODM is free and does not have Apple's paid Developer ID signing, so you may need to complete this step the first time you open it. The entire source code is available on GitHub for anyone to inspect.

How to Install the Chrome Extension

Once the extension is installed, Chrome downloads are automatically redirected to ODM, and an ODM button appears on video pages.

Open ODM and select Settings (⌘,) → Browser → Show Extension Folder.
In Chrome, open chrome://extensions and enable Developer mode in the upper-right corner.
Click Load unpacked, press ⌘⇧G, and enter this path: ~/Library/Application Support/ODM/ChromeExtension

If the ODM app is closed, Chrome will download files normally using its built-in downloader.

Tip: In Chrome, go to Settings → Downloads and turn off "Ask where to save each file."

How to Use ODM

Task	How to Do It
Download using a link	Press ⌘N. A copied link is inserted automatically, and you can also add multiple links at once.
Download from Chrome	Start a download as usual, and ODM will automatically capture it.
Download videos	Click the ODM button below a video and select the desired quality. On other supported sites, click the extension icon → Download video.
Pause / Resume	Use the toolbar buttons, right-click menu, or download progress window.
Pause All / Resume All	Use ⇧⌘P / ⇧⌘R.
Open a file	Double-click a file in the list or use Open Folder in the window.

Files are saved to ~/Downloads/ODM/, organized into separate folders according to file type.

If a video displays a "confirm you're not a bot" message, enable Settings → Video → Use my browser sign-in.

Free and Open Source

ODM is completely free and open source under the MIT License. You can explore the code, report issues, or contribute improvements on GitHub.

One request: Please download only videos you have the right to save, such as your own uploads, Creative Commons content, or videos you have permission from the owner to download.