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 includes a 30-day trial with all Pro features. After the trial, you can keep using it for free by sharing with friends (unlock features through referrals), or purchase a lifetime license: $29.99 for Personal use or $59.99 for Commercial use.
Personal use ($29.99 one-time) is for individuals using Ultrafast at home for personal photos and projects. Commercial use ($59.99 one-time) is for business purposes, work projects, company devices, or as part of paid services. Both include lifetime access to all Pro features.
Ultrafast supports 25+ formats including JPEG, PNG, GIF, BMP, WebP, SVG, TIFF, HEIC/HEIF, AVIF, ICO, PSD, and RAW formats (DNG, CR2, CR3, NEF, NRW, ARW, ORF, RW2). RAW format display depends on browser/WebKit capabilities.
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 and video tutorial. It takes about 2 minutes to configure your OS to use Ultrafast as your default viewer.
Pro includes: Thumbnail Strip Browser, EXIF Info Panel, Image Transformations (rotate/flip), and all future Pro features. Get it via 30-day trial, unlock free by sharing (5-20 referrals for different features), or purchase: $29.99 Personal / $59.99 Commercial (one-time, lifetime).
Ultrafast uses ~50MB baseline memory. Actual usage depends on the images you're viewing - it's impossible to use less memory than what's needed to display the images themselves. 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