Ultrafast
Ultrafast
FeaturesCompareSetup Guide
Image viewing, simplified

Invisible UI.
Visible Speed.

You deserve better than waiting for images to load. Better than hunting for features. Better than complicated interfaces.

macOS 10.13+ • Apple Silicon & Intel

Also available for Windows

20-30
Images Cached
<500ms
Startup Time
150MB
Installed Size
FREE
Forever

Traditional image viewers are painfully slow

Windows and Mac users deserve better than opening ONE file at a time with no pre-caching.

Traditional Viewers

  • Opens ONE file at a time
  • No pre-caching or preloading
  • Clunky gallery view
  • Slow with high-res images

Ultrafast

  • Opens entire folders instantly
  • 20-30 image smart caching
  • Invisible, minimal UI
  • Zero lag, even with 4K photos

Built for speed

Every feature designed to get out of your way and let you view images at light speed.

Double-Click to Open. Double-Click to Exit.

The simplest image viewer experience ever created. No learning curve.

Aggressive Caching

20-30 images cached ahead. Zero lag even with RAW files.

Invisible UI

Hidden toolbars appear only when needed. Nothing between you and your images.

Input Perfected

Mouse wheel, trackpad, and keyboard navigation optimized for smooth control.

Full Folder View

Opens entire folders instantly. Unlike Preview, which opens ONE file.

No Bloat

Fast image viewing. That's it. No AI nonsense, no cloud sync, no tracking.

How it compares

See why Ultrafast is the best image viewer for Mac.

FeatureUltrafastPreview.appACDSee
App Size150MBBuilt-in~200MB
Opens full folders
Invisible UI
Images cached20-3002-3
Mac trackpad optimized
Memory usage~50MB*~100MB~200MB

*Actual memory usage depends on the images you're viewing. We cache 20-30 images for instant navigation.

What users say

Preview is painfully slow for browsing lots of photos. I just want something that pre-caches the next few images.

— Mac user on Reddit

I've used FastStone for 15 years on Windows. When I switched to Mac, I was shocked there's no equivalent.

— Former Windows user

The invisible UI is genius. It's like the image viewer disappears and you're just looking at photos.

— Beta tester

Frequently Asked Questions

Everything you need to know about Ultrafast

Yes! Ultrafast is completely free with all features included. No trials, no paywalls, no subscriptions. Everything is unlocked from the start.
Ultrafast supports JPG, PNG, GIF, BMP, WebP, SVG, TIFF, HEIC/HEIF, AVIF, and TGA formats.
Yes! Ultrafast works on Apple Silicon (M1, M2, M3, M4) and Intel Macs running macOS 10.13+, as well as Windows 10/11. We provide optimized builds for each platform and architecture.
Check out our detailed setup guide with step-by-step instructions. It takes about 2 minutes to configure your OS to use Ultrafast as your default viewer.
All features are free: Filmstrip view (press T), Info panel with EXIF metadata (press I), image transformations (rotate/flip), format conversion, and more. Press H for full keyboard shortcuts.
Ultrafast uses ~50MB baseline memory. Actual usage depends on the images you're viewing. We cache 20-30 images for instant navigation.

Ready to view at light speed?

Works on Apple Silicon and Intel Macs • FREE trial with all features

macOS 10.13+ • Apple Silicon & Intel • FREE trial with all Pro features

Also available for Windows

Need help setting as default? View setup guide
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© 2025 Ultrafast Image Viewer. Designed in California.