FullCheckApp Knowledge Base

Website checks, analytics and ads — explained simply

What each check means, why it matters, and what happens to your website or ads when something quietly breaks.

Website monitoring

Website monitoring

Your website’s technical health: availability, speed, analytics tags, search engine settings, product feeds and the key text on your pages.

01

Website availability check

What “website down” actually means, how 500 and 503 errors differ from a timeout, and why visitors may not reach your website even though it works for you.

11 min
02

Inner page availability check

Why the home page can work while the catalog, cart or checkout returns an error, and which pages to check first.

10 min
03

Website speed check

What PageSpeed and Core Web Vitals are, and how loading speed affects your Google rankings and the number of leads you get.

13 min
04

Domain expiration monitoring

What happens when a domain registration expires: the website, email and ads all stop. How to find the expiration date and never miss a renewal.

9 min
05

Google Tag Manager check

What a GTM container is, why analytics and pixels run through it, and what breaks when the container code disappears from your pages.

10 min
06

Google Analytics 4 tag check

How the GA4 tag collects visitor data, why it can vanish after a website update, and what that means for your reports and ads.

10 min
07

Facebook Pixel check

Why you need the Meta Pixel, how it sends events to your ad account, and what happens to retargeting when the pixel stops working.

9 min
08

TikTok Pixel check

What the TikTok Pixel does, what data it sends to optimize your ads, and how to tell whether it’s really installed on your website.

8 min
09

robots.txt check

What a robots.txt file is, how a single Disallow: / line hides your whole website from search engines, and why it often happens after moving from a staging site.

12 min
10

sitemap.xml check

Why a website needs a sitemap.xml, how search engines use it to find pages, and why pages can drop out of it.

13 min
11

Page SEO tags check

What a search engine sees on a page: title and description length, the H1 heading, noindex, canonical, hreflang and Open Graph tags for social media.

13 min
12

Schema.org markup check

What Schema.org structured data is, how it adds star ratings, prices and answers to Google results, and why it can quietly break.

11 min
13

Google Merchant Center feed check

What a product feed is, how Merchant Center pulls products from it for Google Shopping and Performance Max, and why a feed stops loading.

10 min
14

Feed product count monitoring

Why the number of products in a feed can suddenly drop, how that hits your Shopping ads, and how to catch the drop in time.

12 min
15

Title tag change monitoring

What a page title is, how it appears in search results, and why a CMS or plugin can quietly replace it.

12 min
16

Meta description change monitoring

What a meta description is, how Google builds the page snippet from it, and what happens when it gets rewritten or deleted.

12 min
17

H1 heading change monitoring

What an H1 heading is, why it matters to search engines and visitors, and how it changes when a website is edited.

11 min
18

Page text change monitoring

Why you should watch the text on key pages: an accidental edit, a new template or someone else’s admin access can change the content without you knowing.

10 min

Google Search Console + GA4

Analytics

Google Search Console and Google Analytics 4 data: how people find your website in search, who visits it and what drives results.

Budget, campaigns, products

Google Ads

Your Google Ads account: budget, errors, campaign performance and products in Google Shopping.

Check your website

Add your website address — the first check runs right away, and you’ll see what shape it’s in.

Check for free