Whole numbers laid on a square spiral, primes lit one by one – and the diagonals they mysteriously prefer.
Whole numbers laid on a square spiral, primes lit one by one – and the diagonals they mysteriously prefer.
In the app you can adjust the colours and zoom. It runs natively on your Mac, drawn live in real time – no video, never quite the same twice.
Use it on your Mac
- Get SCRNSVRS free from the Mac App Store.
- Select Ulam Spiral in the library.
- Click Set as Screensaver or Set as Wallpaper – or both.
Preview free · macOS Tahoe 26 or laterNeed a hand? Read the setup guide.
Ulam Spiral FAQ
How do I set Ulam Spiral as my screensaver on a Mac?
Install SCRNSVRS free from the Mac App Store, select Ulam Spiral in the library and click Set as Screensaver. macOS starts it whenever your Mac is idle, exactly like a built-in screensaver.
Can I use Ulam Spiral as a live wallpaper?
Yes. Click Set as Wallpaper in SCRNSVRS and Ulam Spiral plays on your desktop behind your windows and icons. You can use it as screensaver and wallpaper at the same time.
Is Ulam Spiral free?
Ulam Spiral is included in SCRNSVRS Unlimited. It's free for your first 7 days; after that Unlimited is $1.99/month or $9.99/year (€1.99/month or €9.99/year) for every screensaver, including new ones. It can also come up in Free this month, when 25 premium screensavers are free for everyone.
Is Ulam Spiral a video loop?
No. Ulam Spiral is rendered live on your Mac with Metal, so it never repeats and stays sharp on any display size. The clip on this page is a screen recording of the real thing.
Will Ulam Spiral slow down my Mac or drain the battery?
No. SCRNSVRS drops to 30 fps on battery and stops rendering when the wallpaper is covered by a full-screen app, so Ulam Spiral costs next to nothing in everyday use.
Which Macs does Ulam Spiral run on?
Ulam Spiral needs macOS Tahoe 26 or later.
