Why doesn't an uptime check notice a noindex tag?

Uptime checks look at whether the server responds, usually by checking the HTTP status code and sometimes a keyword on the page. A noindex tag doesn't change the status code, and unless you configured a check to look for that exact string, the response still counts as healthy.

Which SEO changes cause the most damage while a site stays online?

A noindex on important templates and a robots.txt Disallow covering key sections, because both can remove pages from Google over a few weeks. Canonicals pointing to the wrong host come close behind. Title and meta changes usually do slower, smaller damage.

Does Deltio measure page speed or Core Web Vitals?

No. Deltio monitors uptime but not detailed performance. For page speed, real user metrics or Core Web Vitals, use a performance tool such as Pingdom, or PageSpeed Insights and the Core Web Vitals report in Search Console.

Can I use Deltio and Pingdom together?

Yes. They cover different layers. Pingdom handles performance and transaction checks, and Deltio handles SEO tags, sitemaps, robots.txt and marketing tags, so running both leaves little duplicated alerting.

How much does Deltio cost compared to Pingdom?

Deltio Starter is £24 / €29 / $31 a month, or £20 / €24 / $26 a month billed annually, for up to 50 sites. Professional (up to 200 sites) is £49 / €59 / $64 and Enterprise (up to 500 sites) £119 / €139 / $149 a month. Pingdom prices by checks and features, so compare against what you need to monitor.

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Pingdom Alternative: Deltio vs Pingdom for Agencies

Pingdom is a well-known uptime and performance monitor: it tells you when a site is down and how fast it loads. Deltio is a Pingdom alternative for agencies whose bigger worry is the SEO and tracking changes that happen while a site stays online, which an availability check can't see.

A site can pass every uptime check while the <title> on its category pages turns into "Home", a noindex gets deployed from staging, or thirty URLs drop out of the sitemap. From Pingdom's point of view nothing happened, because the server kept answering with a 200.

What Pingdom does well

Pingdom is mature and dependable at the job it was built for. It checks whether sites are reachable, tracks response times and page speed, offers transaction monitoring for flows like login or checkout, provides public status pages, and alerts you when something goes down. If your core need is availability and performance, it has done that for years and does it well.

The trouble for agencies is that most of what costs a client relationship doesn't involve downtime.

Problems that happen while the site is up

Consider what a typical week of releases can do to a client site without taking it offline.

A theme update drops the canonical tag from product templates. A developer copies a robots.txt from staging, and production now serves Disallow: /. The WordPress setting "Discourage search engines from indexing this site" stays ticked after a migration. A GTM container gets removed from the header during a redesign, so GA4 stops recording sessions. The sitemap plugin is reconfigured and stops listing blog posts.

Every one of those pages still loads quickly. Response times look normal. A performance monitor has no reason to raise anything, and the first sign is usually a drop in Search Console or an empty analytics report weeks later.

What Deltio checks instead

Deltio reads each client site's sitemap and its pages on a daily cycle, and compares each result with the previous check. The page-level checks are noindex (in the meta robots tag), canonical, title, meta description and H1. At site level it watches robots.txt, URLs added to or removed from the sitemap, SSL certificate and domain expiry, and whether a maintenance page is being served. It detects when GA4, Google Tag Manager or the Meta Pixel disappear, and checks cookie consent banners.

It also monitors uptime, so availability is still covered, just without Pingdom's depth on performance.

Alerts are set per site and go to Slack or email, naming the site and the affected URLs.

Feature comparison

What you're monitoring	Deltio	Pingdom
Uptime and downtime	Yes	Yes
Detailed response time and page speed	No	Yes
Transaction monitoring	No	Yes
SEO tags (title, meta, H1, canonical, noindex)	Yes	No
Sitemap URLs added or removed	Yes	No
robots.txt changes	Yes	No
GA4, GTM and Meta Pixel	Yes	No
Priced for many client sites	Per site, in plan tiers	Per check

Both tools change over time, so check each vendor's site for current details.

Choosing between them, or running both

Pingdom is the right choice if you need detailed performance data, real user metrics, transaction checks and polished public status pages. Deltio doesn't try to compete there.

Deltio fits when downtime isn't the main risk and you want to catch the configuration changes that affect rankings and reporting. It's also honest to say Deltio's checks are daily, so it won't warn you about an SEO change within minutes the way an uptime monitor warns you about an outage.

Because the overlap is small, some agencies run both: Pingdom for performance and transactions, Deltio for SEO and tag changes.

Cost

The two are priced on different units. Pingdom prices around checks and features. Deltio prices by number of sites: Starter covers up to 50 sites and 5,000 URLs for £24 / €29 / $31 a month, or £20 / €24 / $26 a month billed annually; Professional covers up to 200 sites for £49 / €59 / $64 a month; Enterprise covers up to 500 sites for £119 / €139 / $149 a month. Every plan has a 14-day free trial.

For a fair comparison, list the sites you manage and what you actually need to watch on each, then price both against that list. If you want to see what Deltio flags on sites that have been "up" all along, you can start a trial here. For a wider look at the category, see the best website monitoring tools for agencies.

Frequently asked questions

Why doesn't an uptime check notice a noindex tag?: Uptime checks look at whether the server responds, usually by checking the HTTP status code and sometimes a keyword on the page. A noindex tag doesn't change the status code, and unless you configured a check to look for that exact string, the response still counts as healthy.
Which SEO changes cause the most damage while a site stays online?: A noindex on important templates and a robots.txt Disallow covering key sections, because both can remove pages from Google over a few weeks. Canonicals pointing to the wrong host come close behind. Title and meta changes usually do slower, smaller damage.
Does Deltio measure page speed or Core Web Vitals?: No. Deltio monitors uptime but not detailed performance. For page speed, real user metrics or Core Web Vitals, use a performance tool such as Pingdom, or PageSpeed Insights and the Core Web Vitals report in Search Console.
Can I use Deltio and Pingdom together?: Yes. They cover different layers. Pingdom handles performance and transaction checks, and Deltio handles SEO tags, sitemaps, robots.txt and marketing tags, so running both leaves little duplicated alerting.
How much does Deltio cost compared to Pingdom?: Deltio Starter is £24 / €29 / $31 a month, or £20 / €24 / $26 a month billed annually, for up to 50 sites. Professional (up to 200 sites) is £49 / €59 / $64 and Enterprise (up to 500 sites) £119 / €139 / $149 a month. Pingdom prices by checks and features, so compare against what you need to monitor.