Everything we check, in one place.
Our free check looks at one page of your site in about a minute. Aster Cloud goes further: it crawls every page, keeps watching around the clock, and tells you when something needs attention. Here is everything both of them look at, in plain English. The list grows as we add new checks.
- 114
- individual checks
- 10
- areas covered
- 5 min
- uptime checks with Aster Cloud
Security & HTTPS
The basics that keep visitors safe and stop browsers showing warnings.
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HTTPS and secure redirects
Checks the site loads securely, and that anyone typing the plain http address is moved onto the secure version.
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SSL certificate
Valid, trusted, covers both the www and non www addresses, and how long it has left.
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Encryption strength
Makes sure the server uses modern TLS and has switched off the old versions browsers no longer trust.
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HSTS
Tells browsers to always use the secure version of your site, even on the very first visit.
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Security headers
Content Security Policy, clickjacking protection, MIME sniffing protection and referrer policy.
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Mixed content
Finds insecure files on secure pages, which break pages or remove the padlock.
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Cookie security
Checks cookies set by the site carry the Secure and HttpOnly flags.
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Server software exposure
Spots servers announcing their exact software versions, and PHP versions that no longer get security fixes.
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security.txt
Whether security researchers have a way to report a problem to you.
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Software & updates
Out of date software is the most common way small business sites get hacked.
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Platform and version
Recognises WordPress, Joomla, Drupal, Magento, PrestaShop, OpenCart, Shopify, Wix, Squarespace and many more, and checks the version against the latest release.
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Plugin and theme updates
Compares WordPress plugin and theme versions against WordPress.org.
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Script libraries
Spots jQuery, jQuery UI, Bootstrap, AngularJS, Vue, Lodash, Moment.js and others, and checks each version against published security advisories and end of life dates.
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What your site is built on
Page builders, online shop software, web server, CDN or firewall, and the hosting network.
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Search engine basics
What Google reads first when it decides what a page is about.
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Titles and descriptions
The blue link and the text under it in Google: present, and the right length.
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Headings
One clear main heading, with subheadings that break the page into sections.
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Content depth
Flags thin pages that give search engines too little to go on.
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Image alt text
Descriptions on images for screen readers and Google Images.
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Social sharing
How links to your site look when shared on Facebook, LinkedIn and WhatsApp.
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Structured data
Checks schema.org markup is present and readable, for rich results like opening hours and reviews.
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Internal links
Whether pages link to each other so people and search engines can find their way around.
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Speed
Slow sites lose visitors and rank lower, especially on phones.
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Server response time
How quickly the server starts sending the page.
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Compression and page weight
Whether pages are compressed, and how heavy they are to download.
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Render blocking scripts
Scripts that stop anything appearing until they have loaded.
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Image loading
Lazy loading for images further down the page, and sizes set so the page doesn't jump about.
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Google Lighthouse
Google's own speed test, run on a simulated phone, with the biggest savings listed.
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Core Web Vitals
How fast the site really is for Chrome users over the last 28 days, the data Google uses for ranking.
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Crawlability & technical
Whether search engines (and AI assistants) can find and read every page.
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Status codes
The page loads properly, and missing pages return a real "not found".
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Redirects
How many hops it takes to reach the page.
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Indexing and robots.txt
Nothing accidentally hiding the site from Google.
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AI assistant access
Whether ChatGPT, Claude, Perplexity and Google's AI features are allowed to read and recommend your site.
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Canonical tags
Tells search engines which address is the real one when a page can be reached several ways.
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Mobile setup
The page is set up to display properly on phones.
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Language and favicon
Page language declared, and an icon for browser tabs and search results.
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XML sitemap
A sitemap that lists your pages so new ones get found quickly.
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www and non www
Both versions of the address work, and one redirects to the other.
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Broken links
Tests the links on the page, and flags social media links that need a manual look.
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Accessibility
Can everyone use the site, including people using screen readers, the keyboard or zoom.
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Form labels
Every form field has a label a screen reader can announce.
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Link and button names
Icon only links and buttons have a name, so they aren't read out as just "link".
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Pinch to zoom
Visitors can zoom in on phones.
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Colour contrast
Text stands out clearly enough from its background to be read easily.
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Page structure
Heading levels in order, and titles on embedded maps, videos and widgets.
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Google Lighthouse accessibility
Google's automated accessibility test, with each problem it finds explained.
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Domain & email
Whether your email reaches inboxes, and your domain is set up to last.
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Email authentication
SPF, DKIM and DMARC, so your emails land in inboxes and no one can easily send email pretending to be you.
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Email transport security
MTA-STS and TLS reporting, which keep email to you encrypted on the way.
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Mail server blocklists
Whether your mail servers are on the spam blocklists other providers use.
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Domain renewal
When the domain needs renewing, and who it's registered with.
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DNS health
Name servers spread across networks, DNSSEC, and CAA records that control who can issue your certificates.
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Trust & compliance
The things customers, Google and the law expect a business website to show.
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Malware and phishing lists
Checks Google's list of dangerous sites and domain blocklists, which would warn visitors away.
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Company details
Finds your company number and checks it against Companies House.
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Privacy policy
A privacy policy linked from the page.
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Cookie consent
Whether tracking cookies are set before a visitor has agreed to them.
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Contact details and upkeep
A phone number or email visitors can find, and a copyright year that shows the site is looked after.
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Full site audit
Aster Cloud crawls every page of your site, not just one, and lists exactly which pages need work.
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Every page checked
Crawls up to 2,000 pages, following links and your sitemap, and reports any that are missing, erroring or won't load.
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Broken links and files
Every broken link, image and file across the site, with the pages they're on.
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Titles and descriptions everywhere
Missing, duplicated and badly sized titles and descriptions on every page.
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Content quality
Thin pages, duplicate pages, heading problems and images missing alt text.
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Insecure content
Every page loading insecure files or linking to the http version of your own site.
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Technical basics on every page
Structured data, mobile setup, language and social sharing tags, page by page.
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Redirect problems
Redirect loops, slow redirects and internal links that point at a redirect instead of the page.
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Slow and heavy pages
Which pages are slow to respond or heavy to download.
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Indexing problems
Pages hidden from Google, hidden pages listed in your sitemap, and pages blocked by robots.txt.
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Site structure
Pages nothing links to, pages buried too deep, and pages with only one way in.
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Works behind bot protection
Paces itself on busy servers and works with most firewalls, so your audit finishes even on well protected sites.
Aster Cloud
Monitoring & alerts
Aster Cloud keeps watching after the report, and emails you when something needs attention.
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Uptime monitoring
Your home page checked every 5 minutes, with an email the moment it goes down and again when it's back.
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Response time history
Uptime for the last 24 hours, 7 days and 30 days, and how fast the site has been answering.
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Change and hack alerts
An email if the home page changes unexpectedly: a new outside script, spam words, or most of the text replaced.
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Renewal reminders
Reminders before your SSL certificate or domain runs out, so neither lapses by accident.
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Weekly audits and alerts
A fresh full audit every week, with an email when your score drops or new problems appear.
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Rankings and backlinks
Where you rank in Google for the searches that matter to you, and who links to your site.
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History and PDF reports
Your score over time, and reports you can print or share with your team.
Aster Cloud
See how your site does
Run the free check on any page in about a minute, no sign up needed. If you'd like the whole site watched, we'll set you up on Aster Cloud.
Everything here is read from what your site shows the public, plus public records like DNS, Companies House and Google's safe browsing lists. We never try to break in, and automated checks can't catch everything, so we always explain what we found and how sure we are.