SEO Monitoring Tool for Agencies
An SEO monitoring tool checks the search-relevant parts of your sites on a regular schedule and alerts you when one of them changes. Deltio is an SEO monitoring tool for agencies and freelancers responsible for many client sites, covering on-page SEO signals, sitemaps, uptime, SSL and marketing tags, with alerts per site in Slack and email.
The need comes from how client sites break. A release goes out on a Friday, a CMS update rewrites a batch of titles, a migration drops a section from the sitemap, and nobody on the client side mentions it because the site looks fine. You find out weeks later from a traffic report, and you are the one who has to explain.
Monitoring is not the same job as auditing
An audit crawler fetches a site when you run it and lists everything that's wrong at that moment. That's the right tool when onboarding a new client or planning a migration.
Monitoring keeps a record of the same signals and compares each check with the one before. Its output isn't a list of every issue on the site, it's the difference since last time. "The H1 on /services/ changed today" is a monitoring result. "43 pages have meta descriptions over 160 characters" is an audit result. Sites break between audits, which is why a quarterly crawl alone hears about regressions late. The distinction is covered in more depth in SEO monitoring vs SEO audit.
What Deltio checks on each site
On a daily cycle, Deltio reads each site's sitemap and the pages listed in it, then compares everything with the previous check. What it looks at falls into four groups.
Indexability comes first: noindex in the robots meta tag or the X-Robots-Tag header, robots.txt, and canonical tags. These are the changes that can take pages out of Google, so they're the ones you want to hear about the same day.
On-page elements come next, meaning title, meta description and H1. If a template update turns a title into "Home" or "undefined", that shows up as a change on each affected URL rather than one vague warning.
The sitemap is compared URL by URL, so you see which pages were added and which were removed. If a release strips, say, forty product URLs from the sitemap, you get forty named URLs.
The fourth group is everything around SEO that fails without an error message. Deltio monitors uptime, SSL certificate and domain expiry, marketing tags (GA4, Google Tag Manager and the Meta Pixel), the cookie consent banner or CMP, and whether a page has been replaced by a maintenance screen. When a tracking tag disappears, conversion reporting stops, and the site gives no sign of it.
Alerts go to Slack and email and are set up per site, so a client's alerts can land in that client's channel. When you want a fresh read without waiting for the next cycle, for example straight after a deploy, you can run a manual SEO scan. On Professional and Enterprise you can export data as CSV for client reporting.
Where it fits, and where it doesn't
Deltio is built for agencies and freelancers accountable for sites they don't fully control: sites deployed by the client's developers, running plugins someone else updates, on hosting you have no access to. One account covers the whole portfolio.
It's a weaker fit in two situations. If you need to know within minutes that a page changed, a real-time crawler is the better choice, because Deltio works on a daily cycle. And an in-house team running a single very large site, with a dedicated enterprise SEO platform and full crawl audits, will want something heavier. Deltio doesn't replace an audit crawler for deep technical analysis; it runs alongside one.
Plans by portfolio size
| Plan | Sites | Monthly billing | Annual billing (per month) |
|---|---|---|---|
| Starter | Up to 50 sites, 5,000 URLs | £24 / €29 / $31 | £20 / €24 / $26 |
| Professional | Up to 200 sites | £49 / €59 / $64 | £41 / €49 / $53 |
| Enterprise | Up to 500 sites | £119 / €139 / $149 | £99 / €116 / $124 |
Every plan starts with a 14-day free trial, long enough to add real client sites and see what the first comparisons turn up. CSV export is included from Professional upward.
Questions to ask when comparing SEO monitoring tools
Test any shortlist on sites you already look after. These questions separate a monitoring tool from an audit crawler with an alerts tab bolted on:
- Does it compare each check with the previous one and alert on the difference, or does it re-report every existing issue?
- Can you add many sites under one account and route alerts per site?
- Does it read the
X-Robots-Tagheader as well as the meta tag? - Does it cover uptime, SSL and tracking tags, or will you still need separate tools for those?
- Does the price scale with sites rather than seats?
A comparison of specific products is in best SEO monitoring tools. To try Deltio on your own portfolio, start a free trial.
Frequently asked questions
- Can an SEO monitoring tool replace Google Search Console?
- No, they answer different questions. Search Console shows Google's view of the site: what's indexed, which queries bring clicks, how crawling is going, usually with a delay of days. A monitoring tool shows what changed on the site itself, soon after it changed. Agencies generally use both.
- Do I need access to a client's CMS or Search Console to use Deltio?
- No. Deltio reads the public sitemap and pages the way a crawler does, so you can add a site without wp-admin logins, plugins or Search Console permissions. That also means a CMS update can't disable the monitoring.
- Will a site that publishes content every day flood me with alerts?
- Deltio watches specific elements (indexability signals, title, meta description, H1, sitemap URLs, tags and availability) rather than every text edit, so rewriting a paragraph doesn't create an alert. On a busy blog, new URLs in the sitemap are expected, and routing that site's alerts to its own Slack channel keeps them out of the way of more urgent ones.
- How often should SEO monitoring run?
- Daily suits most client sites, since Google needs to recrawl a page before a change affects it. Large sites that deploy many times a day, or teams that need to react within minutes, benefit from real-time monitoring instead.
- How much does Deltio cost?
- Starter is £24 / €29 / $31 a month, or £20 / €24 / $26 a month billed annually, for up to 50 sites. Professional is £49 / €59 / $64 a month (£41 / €49 / $53 annually) for up to 200 sites, and Enterprise is £119 / €139 / $149 a month (£99 / €116 / $124 annually) for up to 500 sites. All plans have a 14-day free trial.