Content verification
Keyword monitoring verify what matters
Ensure critical content exists on your client sites, or detect unwanted text like error messages, defacements, and broken deployments.
# last check · shop.example.com
1 failing“Add to Cart”
Required · must contain · case insensitive
“Free Shipping on Orders Over $50”
Required · must contain · case insensitive
“500 Internal Server Error”
Forbidden · must not contain · case insensitive
The page returned 200 OK. The check still failed, because a stack trace was rendering above the fold.
Why keyword monitoring
Catch what uptime checks miss
A site can be “up” but completely broken: showing error pages, missing critical content, or displaying unwanted text after a bad deploy. Keyword monitoring reads the page body itself, so a 200 response with an error message in it still fails the check.
- Verify important content is present on each page
- Detect error messages and broken deployments
- Monitor up to 10 keywords per check
Keyword settings
- Keywords
- 3 / 10
- Searching in
- Visible text
- Case sensitivity
- Off
- On failure
- Open incident + alert
Features
Everything a content check should do
Presence detection
Verify that critical text like 'Add to Cart', pricing, or product names exists on each page.
Absence detection
Alert when unwanted text appears: error messages, stack traces, 'under maintenance', or defacement content.
10 keywords per monitor
Check for up to 10 different keywords on each monitored page. Mix presence and absence checks as needed.
Deployment verification
After a deploy, automatically verify that key content is still rendering correctly. Catch broken builds fast.
Instant alerts
Get notified via email, SMS, Slack, or webhooks when a keyword check fails. Know about broken content immediately.
Incident tracking
Keyword failures create full incidents with timestamps, details, and history, just like downtime events.
By the numbers
Content scanning on every check
Keyword monitoring runs as part of your HTTP uptime check, so every page fetch is also a content check. No extra request, no extra monitor to manage.
10
Keywords per monitor
2
Check modes
24/7
Content scanning
0
Missed issues
How many keywords can I check on a single page?
Keyword monitoring checks up to 10 keywords per monitor. You can use each keyword to confirm that text is present or to confirm that unwanted text is absent.
What can keyword monitoring detect that uptime checks cannot?
A site can return a healthy status while showing an error page, missing content, or a broken deploy. Keyword monitoring verifies the actual page content rather than just whether the server responds.
Can I get alerted when unwanted text appears?
Yes. You can configure keywords for absence so Sentinel alerts you when text such as an error message or maintenance notice shows up unexpectedly.
How will I be notified if a keyword check fails?
Sentinel sends alerts via email, SMS, Slack, Discord, and webhooks the moment a keyword check fails, so the right person knows immediately.
Does keyword monitoring work with other check types?
Yes. Keyword monitoring runs as a sub-check of HTTP uptime monitoring, and the same site can also have SSL certificate, DNS, domain expiration, JSON/API response assertion, ICMP ping, TCP port or heartbeat/cron monitors alongside it.
Is there a free trial?
Yes. Paid plans include a 14-day free trial, there is also a free plan, and you can cancel anytime.
Stop shipping broken pages to clients
Go beyond uptime checks. Add keyword monitoring to catch content issues before your clients notice.
No card for the free plan · 14-day trial on paid plans · Cancel anytime