Blog
Guides and insights on SEO, sitemaps and uptime monitoring.
LinkedIn Insight Tag: how to install it and check it still works
How the LinkedIn Insight Tag works, how to install it directly or through GTM, how to check it loads, and what usually breaks it on client sites.
Soft 404: what it is and how to fix it
What a soft 404 is, how Google detects it, where it shows in Search Console, the usual causes and how to fix each with a 404, content or a redirect.
Website maintenance plan: what to include for client sites
What a website maintenance plan for client sites should cover: updates, backups, security, monitoring, reporting, response times and what to exclude.
GA4 not tracking: how to find what broke and when
GA4 not tracking on a client site? Check the tag, GTM container, measurement ID, consent mode and filters, and find the day the data stopped.
Google Consent Mode v2: a practical guide for client sites
The four Google Consent Mode v2 parameters, basic vs advanced mode, how to verify it with Tag Assistant and gcs/gcd, and what breaks it.
The HTML lang attribute: what it does and what Google ignores
What the HTML lang attribute does for accessibility and browsers, why Google ignores it, valid BCP 47 codes and the mistakes to look for.
Client Website Down? What to Do, in the Right Order
Client website down? What to do, in order: confirm the outage, find the failing layer, contact the right people, update the client and check SEO after.
X-Robots-Tag: syntax, use cases and how to check the header
What the X-Robots-Tag header does, its directives, when to use it over meta robots, how to check it with curl, and the mistakes that deindex sites.
Site removed from Google? How to find the cause, step by step
Your site has vanished from Google. Check site:, URL Inspection, noindex, robots.txt, manual actions, removals, canonicals, 5xx and DNS, in that order.
SEO Client Onboarding Checklist: What to Record in Week One
An SEO client onboarding checklist for week one: the access, files, tags and dates to record so any later change can be traced back to a day.
Website Monitoring for Freelancers: A Setup That Scales
Website monitoring for freelancers with 1 to 15 client sites: what to check free by hand, when to automate, pricing it into a retainer, and holiday cover.
How to Explain an SEO Traffic Drop to a Client
How to explain an SEO traffic drop to a client: a triage order for tracking, Google updates, site changes and seasonality, plus an editable email template.
WordPress Update SEO Checklist: What to Check After Updating
A WordPress update SEO checklist for core, theme and plugin updates: what breaks in Yoast, Rank Math, themes and caching plugins, plus a 10 minute routine.
What Changes on Client Websites: 5 Months of Monitoring Data
Five months of monitoring data from 60 client websites: how often robots.txt, sitemaps, titles, GA4 tags and uptime changed and what agencies should watch.
Website Monitoring for Agencies: Running It Across Clients
Website monitoring for agencies across a client portfolio: alert ownership, onboarding new sites, checks by site type, weekly reviews and offboarding.
SEO Monitoring vs Rank Tracking: Leading and Lagging Signals
SEO monitoring vs rank tracking: why ranking drops lag behind site changes, what each tool catches, and how to read a drop by checking changes first.
A Shareable Status Page for Your Client Sites
Why and how to give clients a shareable status page: what to show, what to leave off, and how it makes the monitoring you run visible.
How to Monitor a Shopify Site for SEO Changes
How to monitor a Shopify store for SEO changes from apps and theme edits: canonical, noindex, robots.txt and marketing tags, with same-day alerts.
SEO Alerts in Slack for Your Agency
How to get SEO alerts in Slack: which events to send, how to set up the webhook, and how to keep the channel high-signal instead of noise.
How to Monitor a WordPress Site for SEO Changes
How to monitor a WordPress site for SEO changes from plugin and theme updates: noindex, canonical, robots.txt and marketing tags, with same-day alerts.
How to Fix Index Coverage Errors in Search Console (and Catch Them First)
How to fix Index Coverage errors in Google Search Console by cause, and how to catch the on-page changes that create them before Google reports them.
Duplicate Content: How to Check for It and Keep It Fixed
How to check a site for duplicate content, where the copies come from, and how to keep canonical tags correct after every deploy.
Website Code Change Monitoring: Catch the Deploy That Broke Your SEO
How to monitor a website for code changes that affect SEO: head tags, headings, hreflang and marketing tags, and how to get alerted the same day.
Website Migration SEO Checklist: What to Monitor Before and After
A website migration SEO checklist for agencies: what to record before launch, what to verify on the day, and what to monitor for 30 days after.
White-Label Website Monitoring for Agencies
White-label website monitoring for agencies: watch every client site from one account, share a status page, and catch problems before the client does.
Website Monitoring in Your Monthly Client Report
Turn website monitoring data into your monthly client SEO report: uptime, incidents caught, SEO changes and SSL deadlines. Export to CSV with Deltio.
Does Downtime Hurt SEO? What Really Happens to Rankings
Does downtime hurt SEO? How Googlebot handles a down site, when a blip is harmless, when a long outage hurts rankings, and how to catch it fast.
H1 Tag Checker: How to Find Missing and Duplicate H1s
What an H1 tag checker looks for, and how Deltio automatically flags missing, duplicate or changed H1 tags on every page of your client sites.
Title Tag Checker: Missing, Duplicate and Truncated Titles, Caught Early
A title tag checker that scans every URL for missing, duplicate or truncated titles, and flags any change it finds between scans.
Meta Description Checker: Catch Missing, Truncated and Duplicate Tags
What a meta description checker catches: missing, too long, too short and duplicated tags, and how Deltio flags changes across every client site.
Hreflang Checker: Find and Fix Broken Tags
What a hreflang checker checks: return tags, language codes, x-default, canonical conflicts. See how Deltio flags every change.
Canonical Tag Checker: Find and Fix Broken Canonicals
A canonical tag checker that finds missing, duplicate or wrong canonicals on every URL and alerts you the moment one changes.
Uptime and SEO Monitoring, in One Place
Uptime and SEO monitoring combined: what uptime checks catch, what they miss (noindex, canonical, sitemap, SSL), and why one dashboard beats three tools.
SSL Certificate Expiry Monitoring: Stop Finding Out From a Client
SSL certificate expiry monitoring: what happens when a certificate expires, why auto-renewal fails, how to check it, and how to alert across client sites.
Get Alerted When robots.txt Changes
Set up a robots.txt changed alert: which edits are dangerous, why crawl blocking is not noindex, and how to be notified the moment a rule changes.
Pages Removed From Your Sitemap: What to Do Next
Pages removed from sitemap? Triage in 4 steps: check status codes, find the cause, judge the real SEO impact and fix it today, plus daily monitoring.
Marketing Tag Monitoring: Know When GA4, GTM or Meta Pixel Disappears
How a marketing tag monitoring tool catches GA4, GTM and Meta Pixel tags that disappear, change ID or stop firing, and what to do when one does.
How to Monitor Sitemap Changes Automatically
How to monitor sitemap changes: daily snapshots, diffs of added and removed URLs, lastmod shifts, and why Search Console will not alert you.
How to Check GA4 Is Actually Firing on Every Page
How to check if GA4 is installed correctly: view-source, DevTools, DebugView and Realtime, plus why one page is never enough and what to monitor.
Domain Expiry Monitoring: The Outage Nobody Sees Coming
Domain expiry monitoring explained: what happens when a domain lapses, how to check expiry with RDAP and WHOIS, and how to get alerted before it bites.
Cookie Banner Monitoring: When the CMP Changes and Nobody Tells You
Cookie banner monitoring: why the CMP changes without warning, what breaks in GA4 and Meta Pixel, and how to check consent behaviour by hand.
How to Check Your robots.txt (and the Line That Deindexes a Site)
How to find, read and check a robots.txt file, the one line that can block a whole site from crawling, and why robots.txt changes are a silent SEO risk.
XML Sitemap Best Practices (and What Silently Breaks Them)
XML sitemap best practices: list only canonical, indexable URLs, keep the file current, respect the limits and avoid the mistakes that quietly break it.
How to Check If a Page Is Indexed on Google
How to check if a page is indexed on Google: a site: search, URL Inspection and the Pages report, why pages are not indexed, and how to stay ahead of it.
The Noindex Tag, Explained: What It Does and When to Use It
A noindex tag keeps a page out of search results. What it does, meta tag vs HTTP header, how it differs from nofollow and robots.txt, and when to use it.
Best SEO Monitoring Tools
The best SEO monitoring tools compared for agencies: change detection, rankings, audits and uptime. What each does well, and how to choose.
SEO Change Alerts: Get Notified the Moment SEO Breaks
SEO change alerts notify you the moment a title, canonical, noindex or sitemap changes on a client site. What to alert on and where to send it.
Pingdom Alternative: Deltio vs Pingdom for Agencies
A Pingdom alternative that goes beyond uptime. Deltio monitors SEO, sitemaps, marketing tags and SSL across client sites, with Slack alerts. From £20/mo.
A Website Monitoring Checklist for Agencies
A website monitoring checklist for agencies: what to watch on every client site, how often, and who to alert. Indexing, SEO, uptime, SSL and tags.
SEO Monitoring Tool for Agencies
Deltio is an SEO monitoring tool for agencies. Track SEO metadata, sitemaps, uptime and SSL across every client site, with Slack alerts. 14-day trial.
How to Monitor a Client's Website for Changes
How to monitor client websites for changes: what to watch, the trade-offs of each method and how to cover a whole portfolio without living in browser tabs.
The SEO Changes That Break Sites Silently
The SEO changes that quietly cost agencies traffic aren't the dramatic ones. Data from the sites Deltio monitors shows what actually changes and why.
How to Catch a Noindex Before It Kills Your Rankings
A stray noindex quietly drops pages from Google. How it happens, how to check for it, and how to get alerted the moment it appears.
SEO Monitoring vs SEO Audit: What's the Difference?
SEO audits are a snapshot; SEO monitoring is continuous. The difference, why you need both, and how monitoring catches what audits miss.
What Is SEO Monitoring (and Why Agencies Need It)
SEO monitoring means watching a site for changes that hurt search and getting alerted before traffic drops. What it covers and why agencies need it.
UptimeRobot Alternative: Deltio vs UptimeRobot for Agencies
An UptimeRobot alternative that goes beyond uptime: Deltio monitors sitemaps, SEO, marketing tags and SSL on client sites, with Slack alerts. From £20/mo.
Best Website Monitoring Tools for Agencies
The best website monitoring tools for agencies compared: uptime, SEO, sitemap, SSL and change detection, and the best all-in-one pick for client sites.
Visualping Alternative: Deltio vs Visualping for Agencies
A Visualping alternative for the SEO and technical health of client sites, not just visual changes: sitemaps, SEO tags, uptime, SSL and tags. From £20/mo.
ContentKing Alternative: Deltio vs ContentKing for Agencies
A lighter, agency-friendly ContentKing alternative. Deltio monitors sitemaps, SEO, uptime, SSL and marketing tags with Slack alerts. From £20/mo.
Little Warden Alternative: Deltio vs Little Warden for Agencies
Looking for a Little Warden alternative? Deltio monitors sitemaps, SEO, uptime and SSL on every client site with Slack alerts. 14-day trial, from £20/mo.