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A download manager for Mac

Downloads that are fast, and pick up where they left off.

Komizo takes the downloads your browser starts and fetches them over several connections at once. Pause one, lose the connection, or quit, and it carries on from where it stopped.

curl -fsSL https://zewify.com/komizo/install.sh | sh
Paste it into Terminal. Run it again to update. Needs macOS 15 or later.

Free, with its source on GitHub.

Komizo’s catch panel for a 734 MB zip file: the address, its size and type, a Save as field, the Downloads folder, and Cancel and Start buttons.

The engine

Every download in pieces, every piece watched

Komizo asks the server for the file’s size, cuts it into segments and downloads them side by side into one file. The bar on each row is the segment map: you can see each piece fill in.

  • When a segment finishes, the longest tail left is split and the idle connection takes half
  • A dropped connection is retried on its own, from where it stopped, five times before the download is called failed
  • Pause and resume keep every segment; the list is saved every second, so a crash loses at most that
  • A queue runs up to 8 downloads at a time and starts the next as one finishes
  • If the file changes on the server part way, Komizo notices and starts that one over rather than stitching two versions together
Komizo’s window. Five downloads: two done, one paused at 0%, and two paused part way, each with a bar made of four segments filled to different lengths. The bottom bar reads Idle and Browser connected.
Each row’s bar is its segment map; paused downloads keep theirs until you resume them.

Browser extension

Downloads go to Komizo as you click them

The extension catches downloads the browser starts and links to files, and sends each to the app together with that site’s cookies, so a file behind a login downloads as it would in the browser. It talks to Komizo on your own Mac only, on 127.0.0.1:48512, and the first time it asks you to allow that browser in the app.

Chrome, Edge, Brave, Arc, Vivaldi

The install command puts the extension in ~/Library/Application Support/Komizo/Extension. Add it to your browser once:

  1. Open chrome://extensions and turn on Developer mode.
  2. Click Load unpacked, press ⌘⇧G, paste the folder’s path and choose it. Komizo’s Settings, under Browser, copies the path.
  3. Click the Komizo icon, press Connect to Komizo, and allow it in the app.

Each update replaces that folder, so press the reload arrow on Komizo’s card in chrome://extensions afterwards. Komizo is not on the Chrome Web Store; this is how it is installed.

Safari

Safari’s copy comes inside the app. Turn it on in Safari → Settings → Extensions, then connect it from its popup the same way.

Because Komizo is not signed with an Apple Developer ID, Safari asks you to allow unsigned extensions in its Develop menu each time it starts. Chrome has no such step.

Video

The video you are watching, saved as one file

Play a video, then click the Komizo icon. The popup lists what the page plays, with the one you are watching first, marked Playing now. On sites that send picture and sound separately, Komizo downloads both and joins them into one MP4 on your Mac, without re-encoding. HLS and DASH streams are saved whole.

Tested

Facebook
Videos and reels
Instagram
Reels
TikTok
Videos
X
Videos in posts
Reddit
Videos in posts
Bilibili
Videos
Twitch
Clips
Vimeo
Videos that are not protected
TED
Talks
Internet Archive
Videos

Most other sites work too, when they play an ordinary video file or an HLS or DASH stream.

Cannot be saved

YouTube
Not supported
Netflix, Disney+, Prime Video
Protected (DRM); so are some Vimeo videos
Live streams
No end to save to; Twitch and Rumble live, for example

Tested on 17 October 2026, with public videos, signed out. Sites change their players, so one may stop working before Komizo catches up. The same list is in the app, behind the question mark in its toolbar.

Install

Install, update, uninstall

Komizo installs with one command in Terminal, and never asks for your password.

curl -fsSL https://zewify.com/komizo/install.sh | sh
Paste it into Terminal. Run it again to update. Needs macOS 15 or later.

Where it goes

Into your Applications folder, or into the Applications folder in your home folder when your account cannot write to the main one. It opens its window straight away and stays in the menu bar when you close it, so the extension can always reach it. Settings has a switch to open it at login.

Komizo is installed with this command rather than a download link. Its source is published on GitHub, so you can read exactly what it does.

Updating and uninstalling

Run the same command again to update. From version 0.2.0, Komizo checks once a day and says in its menu when a newer version is out, with the command ready to copy.

To uninstall, quit Komizo, remove the extension from your browser, then delete the app and the folder ~/Library/Containers/com.zewify.komizo. Your downloaded files stay where they are.

Privacy

Your downloads are between you and the site

  • Only the sites you download fromKomizo talks to the server a file comes from, with the cookies the browser would have sent, and to nothing else.
  • The extension stays on your MacIt sends addresses and cookies to the app over your own machine’s loopback address, never over the network, and only to a browser you allowed.
  • No account, no trackingNo sign-in, no analytics and no advertising of any kind.
Read the privacy policy

Download the way your Mac deserves

Komizo is free, with its source on GitHub, for macOS 15 or later.

curl -fsSL https://zewify.com/komizo/install.sh | sh
Paste it into Terminal. Run it again to update. Needs macOS 15 or later.