Nothing onslack.comworth reporting.
Watch the inspection.
We navigate your site the way customers would. Idle time is skipped.
How the composite score works
The overall score is a weighted average of the categories: Getting the product 40%, Trust before buying 20%, Mobile 15%, Speed 15%, and Polish and audit 10%. It is never more than 10 points above the Getting the product score, because a product a visitor cannot get cannot score well on anything else, and never more than 25 points above the weakest category, so one badly broken area is not averaged away. Any issue in the main list caps it at 89, so a score above 90 means nothing worth fixing was found.
Each category starts at 100 and stays there when nothing was found in it, whether or not the inspection got that far. Each distinct verified finding deducts 60 points for a serious problem on the path from arriving to paying, 40 for another serious problem, 30, 15 or 8 by high, medium or low severity otherwise, and 4 for an audit finding. Each additional finding below the list takes 2 more points off the overall score, up to 10. Scores stop at zero and round to whole numbers. The formula is fixed and versioned, so the same saved evidence always receives the same score.
The accessibility page shifts content during load
On /accessibility at desktop width, content moves under the reader while the page finishes loading. Cumulative layout shift measures 0.305, above the 0.25 boundary Google classes as poor, and the largest shift is attributed to the hero content container div.o-content-container.o-hero__content. The measurement was taken before any scrolling or clicking, and the same value came back on a fresh load.
The chat launcher covers policy body text on mobile
On /acceptable-use-policy at a 390px wide viewport, the circular purple chat launcher is painted over the paragraph that begins "The AUP may change as Slack grow". The button covers the end of that line and the middle of the following line, so "check back regul... or" is unreadable. The launcher sits inline with the text column rather than clear of it, and the occlusion is present on a fresh load of the page at the initial scroll position.
Three security response headers are missing on the homepage
The response from https://slack.com/ is missing Content-Security-Policy, X-Content-Type-Options: nosniff, and Cross-Origin-Resource-Policy.
The chat launcher covers text on the About page
On /about at a 390px wide viewport, the circular chat launcher sits on top of the body copy and covers part of the line "Slack was acquired by Salesforce in ...", so the digits of the year are hidden behind the purple button. The launcher is anchored over the text column rather than clear of it, and the same overlap appears at the same spot on repeat loads. The rest of the paragraph renders normally, so only the characters under the button are lost.
Probie fixes this for you.
Stop customers hitting the same friction. Connect your codebase and Probie reproduces these failures, tests the fix, and opens a pull request for your review.
Sign up and get this fixedFree inspection
What should Probie inspect next?
Enter a project URL. There is nothing to install.
Probie checks every issue twice, respects robots.txt, and backs off at bot challenges.
Enter an address and we will email the report card link.