OpenDisk
Fast macOS disk-usage analyzer with an interactive sunburst chart — scans a full drive in seconds.
Free · Open sourceLatest versionMac
About OpenDisk
See what's filling up your Mac and clear it out. Free and open source.
Download · Mac App Store · Homebrew
OpenDisk scans your drive and shows you where the space went, so you can find the big stuff and delete it. It's a free alternative to DaisyDisk, and it scans about twice as fast.
What you can do with it
- Scan a 1 TB drive in about 17 seconds. Results fill in while it's still scanning.
- Rescan in a couple of seconds, because OpenDisk only looks at what changed since last time.
- Click into any folder to dig deeper, and hover to see exact sizes.
- Search every file on the drive by name, with results as you type.
- Drag things you don't need into the Collector, see how much space you'll get back, and delete them all at once.
- See purgeable space and caches, so the numbers match what macOS reports.
- See external drives as soon as you plug them in.
Speed
Full scan of a 1 TB drive on an Apple Silicon Mac, with a cold cache.
Rescanning the same drive with OpenDisk is 20 to 28 times faster than the first scan.
Good to know
Why does it need Full Disk Access? Without it, macOS hides parts of the disk and the totals come up short. OpenDisk asks on first launch. You can also turn it on in System Settings > Privacy & Security > Full Disk Access.
Is deleting safe? Deleting from the Collector is permanent and skips the Trash, so check what's in it first. OpenDisk won't let you delete system folders, your home folder, or your Library.
Does it send any data? No. The downloaded version checks opendisk.app for updates, and that's the only network request it makes. There are no analytics or accounts.
How it's fast
- It reads directory entries in bulk with
getattrlistbulk(2)instead of callingstaton every file. - It runs a small pool of readers, about 8 for a whole drive. APFS locks directory reads, so adding more threads makes it slower.
- It stops at mount points and snapshots, so scanning
/never counts the same disk twice. - It keeps each finished scan and replays filesystem events on the next run, so it only rescans folders that changed.
Description adapted from the project README.
- Version
- 1.2.8
- Updated
- Oct 9, 2026
- Size
- 4.1 MB
- License
- MIT License
Open source details
- Source code
- Exact source for v1.2.8
- Released
- Oct 9, 2026
- GitHub stars
- 316
- Website
- opendisk.app
Community project. Help and bug reports go to the maintainers on GitHub; AppsXi does not provide support for this app.
License
PermissiveMIT License
Use, change and share it freely, including in closed source apps, as long as the copyright notice stays.
Read the full licenseHow this app was checked
AppsXi checks every version before it is listed.
Signed by Andrei Golli (3NT3PH4U3S)
Apple Developer ID team 3NT3PH4U3S
Notarized by Apple
Hardened Runtime on
File matches the hash GitHub published
SHA-256 e453d8bc665d6ad70806259793f514061ebdebd099121a9d26e5c3106a389840
No malware found
ClamAV 1.5.4 on Oct 14, 2026
Install and behavior test in a virtual machine: not run yet
Coming soon for all listings.
Updates itself from the maintainer's own feed
sparkle: https://opendisk.app/appcast.xml. AppsXi checks each new version too.
Versions
1.2.8checked
Checked Oct 14, 2026 · Mac
ZIP · 4.1 MB
Questions about OpenDisk
Is OpenDisk free?
Yes. OpenDisk is free and open source under the MIT License. AppsXi lists the maintainers' official release and does not charge for it.
Is OpenDisk safe to download?
AppsXi downloads every version of OpenDisk from the maintainers' official GitHub release and checks it before it is listed. For version 1.2.8 (checked Oct 14, 2026), the Mac download is signed by its developer and notarized by Apple, each file matches the checksum GitHub publishes for the release, byte for byte and a malware scan found nothing.
Does OpenDisk run on Apple silicon Macs?
Yes. OpenDisk has a native Apple silicon build, and it runs on Intel Macs too.
What does OpenDisk need to run?
OpenDisk needs macOS Sequoia (15) or later.
Who makes OpenDisk?
OpenDisk is an open source project by 137137137 on GitHub (137137137/OpenDisk). Help and bug reports go to its maintainers there.
Reviews
No reviews yet. Anyone who downloads it from AppsXi while signed in can review it a day later.
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