Pre-flight check for macOS

Don't ship a broken launch.

Mizzen scans your site for the things you ship by accident: dead links, missing previews, exposed keys. It finds them before anyone else does.

Buy Mizzen, $19See how it works

one-time purchase · lifetime license · free updates

Mizzen
pre-flight
launch.mysite.comproduction
0/100
Almost ready

Fix 2 items and you're clear to ship.

  • HTTPS & valid certificate
  • All links resolve
  • OG image present
  • No exposed secrets
  • Social previews render
checksHTTPSDead linksOG imagesExposed keysCTA responsesX previewsSlack unfurlsiMessage cardsLinkedIn previewsMeta tags

One scan, not a dashboard

No CI to wire up, no account to make. Paste a URL, get a verdict in about ten seconds.

An honest go / no-go

A single score you can trust, with every issue spelled out as a plain, fixable item.

Lives in your menu bar

A real native Mac app that watches your shipped sites and pings you the moment one breaks.

No. 01 / failure modes

You tested the happy path. The launch breaks everywhere else.

The stuff that embarrasses you on launch day is never the stuff you were looking at. Mizzen watches the rest, live, before you publish.

Dead links

That one button that 404s the moment someone clicks it.

Missing OG images

Your launch shared as a naked gray box on X, Slack, and iMessage.

Exposed keys

An API key or secret left sitting in your shipped source.

Broken social previews

Titles, cards, and thumbnails that render wrong everywhere they matter.

No. 02 / how it works

Clear to ship in three steps.

No dashboards to learn. No CI to wire up. Open the menu bar, scan, fix. That's the whole thing.

  1. Step 01

    Point Mizzen at your site

    Paste a URL into the menu-bar app. No setup, no account, no config files.

  2. Step 02

    Run one scan

    Mizzen sweeps your live site in seconds and grades it go / no-go.

  3. Step 03

    Fix what it finds

    Every issue comes back as a plain, fixable item, not a cryptic audit.

Checks how your link unfurls everywhere it lands

XSlackiMessageLinkedInDiscordFacebook

No. 03 / the toolkit

Small app. Thorough about your launch.

01

One-tap scan

A whole pre-launch sweep from your menu bar in about ten seconds.

02

Go / no-go score

A single, honest verdict on whether this thing is safe to ship.

03

Watched sites

Keep an eye on sites you've shipped and get told the moment one breaks.

04

Social previews

See exactly how your link renders on X, Slack, iMessage, and LinkedIn.

05

Exportable reports

Hand a clean report to a client or teammate, no screenshots required.

06

Native menu-bar app

A real Mac app that lives where you work. Free updates, forever.

No. 04 / a closer look

The whole app fits in a popover.

No window to manage, no tab to keep open. Everything Mizzen does lives one click from your menu bar.

Dead link
no-go
/checkout 404 Not Found
linked from
  • /nav + footer
  • /pricingbody CTA
how to fix

This link points to a page that returns 404. Update the URL or remove the link, then re-scan.

Every issue, explained in plain English

Tap any failure to see exactly where it lives, what links to it, and how to fix it. No cryptic audit codes, no guessing.

Watched sites
3 sites
  • mizzen.dev
    24 checks · clear · 2h ago
  • blog.mizzen.dev
    18 checks · clear · 2h ago
  • shop.mysite.com
    2 links now 404 · 4m ago
A site just broke

shop.mysite.com — 2 links started returning 404.

Mizzen · now

Sites break after launch day, too

Keep an eye on everything you've shipped. Mizzen re-checks in the background and pings your menu bar the moment something goes red.

Pre-flight report
86
launch.mysite.com
Jul 1, 2026 · 9:41 AM
  • HTTPS & valid certificate
  • All 24 links resolve
  • No exposed secrets
  • OG image present
  • Social previews render

Hand off a clean report

Export a tidy pre-flight report as a PDF or share a link, so a client or teammate can see the launch is clear without a single screenshot.

No. 05 / pricing

One price. Pay once. Done.

No subscription, no seats, no upsell. Buy Mizzen and it's yours.

launch price
$19$29one-time

Lifetime license. Goes to $29 after launch.

  • Unlimited scans, forever
  • Go / no-go launch score
  • Watched sites + break alerts
  • Social preview checks (X, Slack, iMessage, LinkedIn)
  • Exportable reports
  • Free updates via auto-update
Buy Mizzen, $19

Secure checkout via Stripe · License emailed instantly

Ship it clean.

Run one scan before you hit publish. It's $19, and it's cheaper than a broken launch.

Buy Mizzen, $19

Requires macOS · Apple Silicon & Intel · auto-updates