Now available

StylePort 1.0.0 is available as a signed direct download; the public TestFlight beta remains open.

Get StylePort

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.

Get StylePort See what it does
macOS 14+Free & open sourceNo account
Style manager · StylePort Local
✓
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.

01

Import without friction

Choose a local .css or .user.css file, paste CSS directly, or review a style from a URL before installing it.

02

Make themes yours

Adjust colors, ranges, toggles, select menus, text, and image variables exposed by UserCSS themes.

03

Apply precisely

Match styles to domains, URLs, URL prefixes, and regular expressions with the mature Stylus matching engine.

04

Keep control

Enable, disable, edit, reorder, back up, restore, and update styles from one focused library.

StylePort import screen in Safari with file, URL, and pasted CSS choices

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.

Local storage

Your styles and settings stay in Safari extension storage on your Mac.

No surveillance

The app has no behavioral analytics, advertising, cross-app tracking, or StylePort account. Optional tips use purchase reporting only.

Explainable access

Website permission is used only to match and apply the styles you choose.

Read the complete privacy policy →

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 StylePort

StylePort for Safari

Choose how you get StylePort.

The RelayByte direct edition is available now. Apple’s public TestFlight beta remains open, while the Mac App Store edition is coming soon. Every channel keeps the complete app free.

Through AppleBeta open
StylePort app icon

Apple distribution

macOS 14+ · Updates delivered by Apple

TestFlight betaAvailable now

Try the Apple-distributed beta and help test StylePort before its App Store release.

Join TestFlight
Mac App StoreComing soon

The App Store edition is not public yet. There is no store badge or purchase link until Apple’s release is live.