Import without friction
Choose a local .css or .user.css file, paste CSS directly, or review a style from a URL before installing it.
Safari-first UserCSS manager
The web,wearing your colors.
Import plain CSS and UserCSS themes, tune their variables, and make the sites you use feel like yours—without handing over your browsing history.
macOS 14+Free & open sourceNo account
✓
Midnight for MastodonEnabled · 4 target sites
USERCSS
PLAIN CSS✦USERCSS✦VARIABLES✦URL MATCHING✦BACKUPS✦UPDATES
A proper home for your CSS
Everything your styles need.
StylePort brings a proven UserCSS engine to Safari and reshapes the experience around clarity, reliability, and WebKit.
Make themes yours
Adjust colors, ranges, toggles, select menus, text, and image variables exposed by UserCSS themes.
Apply precisely
Match styles to domains, URLs, URL prefixes, and regular expressions with the mature Stylus matching engine.
Keep control
Enable, disable, edit, reorder, back up, restore, and update styles from one focused library.
One import door
File, URL, or paste. Your choice.
One deliberate import flow replaces scattered upload actions. Every style is reviewed before installation, whether it came from your Mac or a URL you supplied.
- ✓ Preview metadata before installing
- ✓ Give plain CSS a clear name
- ✓ Keep backup restore separate and explicit
Private by design
Your browsing is not the product.
Your styles and settings stay in Safari extension storage on your Mac.
The app has no behavioral analytics, advertising, cross-app tracking, or StylePort account. Optional tips use purchase reporting only.
Website permission is used only to match and apply the styles you choose.
Simple on purpose
Free means the whole app.
No subscription, no premium feature gate, and no separate plans to decode.
StylePort
$0
For everyone, with every feature.
- ✓ Full UserCSS manager
- ✓ Free and open-source
- ✓ Optional support—never required
Want to help?
Make a voluntary one-time contribution toward signing, hosting, testing, and continued development. Support never unlocks a different edition—the whole app stays free.
Support StylePortStylePort for Safari
Choose how you get StylePort.
Download the signed RelayByte edition or install StylePort from the Mac App Store. Both include the complete app for free, while TestFlight remains a separate path for beta testing.
Direct from RelayByteAvailable now
StylePort 1.0.0
Build 2 · macOS 14.0+
Download the exact Developer ID–signed and Apple-notarized release. The direct edition uses StylePort’s signed Sparkle feed for updates and always asks before installing.
Download signed ZIPRelease files and verification
0c806f3fea3857dc8c312eb927e236868c4899b2fef9a938cad3f813a8691132Mac App StoreAvailable now
StylePort on the Mac App Store
Version 1.0 · macOS 14+ · Free
Install the Apple-distributed edition and receive updates through the Mac App Store. Every feature remains free; optional tips never unlock a separate tier.
View on Mac App Store