Website is down
Uptime monitoring should catch the failed response quickly.
Synthetic Monitoring vs Uptime Monitoring
Uptime monitoring and synthetic monitoring are related, but they answer different questions. Uptime monitoring asks whether a page or endpoint responds. Synthetic monitoring asks whether a user-like action or workflow still works — using a real browser to render the page, execute JavaScript, and verify the outcome.
When a simple ping is enough — and when you need a simulated user.
Why the distinction matters
Teams often start with uptime monitoring because it is simple and useful. If a page is down, the business needs to know quickly. But many high-impact failures do not look like downtime. A login flow can fail, a checkout button can stop working, or an API-powered page can load without data.
That is where synthetic monitoring and journey monitoring become useful. They help verify that a customer can complete an action, not just reach a URL.
Synthetic monitoring vs uptime monitoring at a glance
Use uptime monitoring for availability coverage, then add journey checks where customer actions matter.
| Criteria | Uptime monitoring | Synthetic monitoring | NorthDuty angle |
|---|---|---|---|
| Primary question | Is the page or endpoint reachable? | Can a simulated user complete an action? | NorthDuty asks both: page reachable and healthy, and user journey completable. |
| What runs the check | Usually an HTTP ping or basic HTTP GET | A real browser that renders pages and executes JavaScript | NorthDuty uses Playwright + real Chromium for all checks — health and journeys alike. |
| Best for | Availability, SSL, DNS, redirects, and response timing | Login, signup, checkout, forms, and multi-step workflows | Teams that need both availability and customer-facing reliability. |
| Common gap | A page can return 200 OK while still being broken | Synthetic checks can miss visual regressions if they only test the flow | Daily UI diffs help catch visible changes alongside journey failures. |
| Setup style | Usually a URL and alert destination | Usually steps, scripts, or a flow definition | NorthDuty suggests journeys with AI or lets teams write them in plain text. |
Examples of when each type helps
The right monitoring type depends on the failure mode you need to catch.
Checkout fails after cart
Synthetic or user journey monitoring is better because the failure appears several steps in.
A CTA disappears
Visual change monitoring is needed because the page may still respond successfully.
The page loads with missing data
Website health and API call tracking help reveal failed dependencies behind the rendered page.
Best practices for combining both
Most important websites need layered monitoring, not a single check type.
- Use uptime monitoring on every business-critical route
- Add synthetic or journey monitoring to conversion and account-access flows
- Watch JavaScript errors and API calls on JavaScript-heavy pages
- Add visual diffs where layout, content, and CTAs affect conversion
- Keep alerts understandable for the people who need to respond
- Review monitoring depth whenever a page becomes more important to the business
Conclusion
Uptime monitoring is the foundation. Synthetic monitoring is the next layer for customer actions. Website health and visual monitoring close the gaps that both can miss alone.
NorthDuty runs all its checks — health checks and user journeys — in a real Chromium browser via Playwright. That means even the basic uptime check is synthetic: it renders the page, executes JavaScript, captures Core Web Vitals, detects blank screens, and intercepts API calls. Journey monitoring then extends that same browser to simulate multi-step flows, with AI-suggested journeys for teams that want monitoring without writing scripts.
Related NorthDuty Pages
Keep exploring the feature pages and commercial routes connected to this topic.
Feature
Uptime Monitoring
Monitor uptime every 5 minutes by default with HTTP, SSL, DNS, blank-page detection, broken resources, JavaScript errors, and API call tracking.
Explore Uptime MonitoringFeature
User Journey Monitoring
NorthDuty AI suggests 2-5 website journeys. Enable them in one click or describe a custom multi-step flow in plain text.
Explore User Journey MonitoringFeature
Visual Regression Monitoring
Screenshot-based visual regression testing and website change detection for key pages — get pixel diffs on design, content, and layout changes, no code required.
Explore Visual Regression MonitoringFeature
Website Monitoring
Learn how NorthDuty combines health checks, screenshot diffs, and editable user journeys in one website monitoring project.
Explore Website MonitoringPricing
Pricing
NorthDuty pricing for website monitoring: Free, $29 Starter, $79 Pro, $199 Business, and $499 Enterprise plans.
Compare pricing plansRelated reading
More NorthDuty guides on related website monitoring topics.
Article
How to Monitor Website Uptime
Learn how to monitor website uptime, choose the right checks, and catch downtime before it hurts traffic, leads, or sales.
Read How to Monitor Website UptimeArticle
Pingdom vs UptimeRobot
Compare Pingdom vs UptimeRobot and learn when businesses need deeper website health monitoring beyond basic uptime visibility.
Read Pingdom vs UptimeRobotArticle
Datadog vs Pingdom
Compare Datadog vs Pingdom and learn when a focused website health monitoring platform may be a better fit than a broader observability approach.
Read Datadog vs PingdomFrequently Asked Questions
Short answers that summarize the practical takeaways from this guide.
Is synthetic monitoring the same as uptime monitoring?
No. Uptime monitoring checks whether a page or endpoint responds, while synthetic monitoring uses a real browser to render pages and simulate user actions. NorthDuty uses real Chromium for all checks — even basic health checks are browser-rendered, not just pings.
Do I need synthetic monitoring if I already have uptime monitoring?
You likely do if important actions such as checkout, signup, login, or form submission can fail while the page still responds.
What does NorthDuty add beyond basic uptime monitoring?
NorthDuty uses a real Chromium browser for all health checks, capturing Core Web Vitals (FCP, LCP, CLS), blank-page detection, JavaScript errors, API call visibility, and SSL status in every run. On top of that, it adds screenshot-based UI change detection and AI-suggested or plain-text user journey monitoring.
Call To Action
Start monitoring your website with NorthDuty today.
Use NorthDuty to combine uptime monitoring, website health checks, UI change detection, and user journey monitoring in one website project.
Start on the free plan — add your base URL and monitoring starts in minutes.