Page set to noindex
Google stops showing the page in search results.
v1.2.1 Free on WordPress.org 
Know when your SEO breaks
SEO Sentry checks your WordPress pages for SEO changes, like a page set to noindex or a missing canonical URL. When something changes, you get an email.
- Free plugin
- No account needed
- Works with your SEO plugin
SEO problems are easy to miss
A plugin update, a theme change or a small edit can hurt your SEO. Most people only notice when their traffic drops.
robots.txt blocks the site
Search engines can no longer crawl your pages.
Canonical URL changed
Google may rank a different URL instead of yours.
Schema removed
Your pages can lose rich results in Google.
How it works
- 1
Add your pages
Choose pages from your site, or paste a list of URLs.
- 2
SEO Sentry saves a snapshot
The first check saves the current SEO details of each page.
- 3
Get an email when something changes
Every check compares your pages with the snapshot and tells you what changed.
What SEO Sentry checks on each page
You get an alert when any of these change. Each change is marked critical, warning or info, so you know what to fix first.
Robots meta tags
A page gets noindex, nofollow or another robots tag.
X-Robots-Tag header
Your server sends noindex, which never shows in the page source.
SEO title
The page title is changed or removed.
Meta description
The meta description is changed or removed.
Canonical URL
The canonical is changed, removed or points to another domain.
Schema markup
Schema types are added or removed, or the JSON-LD has errors.
Open Graph tags
The tags used for social sharing change.
Twitter/X cards
The Twitter/X card tags change.
H1 heading
The H1 is missing, changed or used more than once.
Content length
The word count drops a lot.
Page errors
The page starts returning an error.
Redirects
A new redirect appears, or a redirect goes to another site.
Site-wide checks
Some settings affect your whole site. SEO Sentry checks these too.
robots.txt
Records every change, and warns you if the file blocks your whole site.
AI crawler rules
Shows what your robots.txt allows GPTBot, ClaudeBot, PerplexityBot and other AI bots to do, and warns you when one stops visiting.
XML sitemap
Checks that the sitemap loads and is valid, and warns you if many URLs disappear from it. You can enter its address if it is not found.
Search engine visibility
Warns you if the WordPress setting “Discourage search engines” is turned on.
Inside the plugin
Each change explains what changed, why it matters and what to check, next to the plugin, theme or setting changes made just before it.
Email alerts and scheduled checks
You get one email per check with all the changes, not a separate email for each one.
- Choose which changes send an email: critical, warning or info
- Run checks every hour, twice a day, once a day or by hand
- An extra check about 90 seconds after a plugin, theme or WordPress update
- Save a known-good baseline before a big update
- Resolve, mute or reopen a change with a note
- A warning with the real error if monitoring stops working
SEO Sentry: 3 changes on example.comToday, 09:00
- Criticalnoindex added/pricing/
- WarningCanonical URL changed/blog/seo-checklist/
- WarningSchema type removed: FAQPage/features/
AI crawler tracking
See when AI bots visit your site and what your robots.txt allows them to do, and get a warning when one stops visiting. No extra setup needed.
- GPTBot
- ClaudeBot
- PerplexityBot
- Google-Extended
- CCBot
- OpenAI SearchBot
- Meta AI
- and more
Simple, private and safe
No account needed
Install the plugin and start. No sign-up and no API key.
Your data stays on your site
Everything is saved in your WordPress database. Nothing is sent to us.
Never changes your settings
SEO Sentry only reads your pages. It does not edit titles, canonicals, schema or robots.txt.
Runs in the background
Checks run on a schedule, not when visitors load your pages.
Multisite support
Each site in a network has its own pages, history and settings.
Open source
The code is GPLv2 licensed and available on GitHub.
SEO Sentry Pro
Find the cause, not just the change
Pro adds root cause analysis, page history, alert rules, webhooks and branded client reports. From $49.99 a year.
Questions? We have answers.
Still unsure? See the documentation or contact us.
Does SEO Sentry change my SEO settings?
No. SEO Sentry only reads your pages and records changes. It does not edit titles, canonicals, robots.txt, schema or any other setting.
Do I still need my SEO plugin?
Yes. Keep using your SEO plugin to manage your SEO. SEO Sentry works next to it and tells you when something changes.
Why do I see no changes after adding a page?
The first check only saves a snapshot of the page. Changes show up after later checks, when something is different from that snapshot.
Will I get an email for every change?
No. You get one email per check with all the changes in it. You can also choose which types of changes send an email.
How often are pages checked?
Every hour, twice a day, once a day or only when you click Check now. SEO Sentry also checks your pages again about 90 seconds after a plugin, theme or WordPress update. With Pro, you can set a different schedule for each page group, also once a week.
Will it slow down my site?
No. Checks run in the background on a schedule, not when visitors load your pages.
Do I need an account or API key?
No. Everything is saved in your own WordPress database, and no data is sent to us.
Does it work with WordPress Multisite?
Yes. Each site in the network has its own pages, history and settings.
Start monitoring your SEO today
SEO Sentry is free, and setup takes a few minutes.