Synthetic tests tell you the site works. Real user monitoring tells you how it feels: how fast each page loads for real people, on their own devices and connections, wherever they are.
One snippet. No change to how your site works.
Slow spike at 15:00: mobile visitors in Singapore waiting on /api/cart.
There are no test scenarios to write. Every real page view becomes a data point.
Tell Acumen Logs which site to measure and you get a small JavaScript snippet.
Add it to the head of your site once. On Webflow, that is the site-wide custom code setting.
Load times, requests, devices, and locations appear as visitors arrive.
Data appears as soon as real visitors load a page.
Page load time on its own hides where the delay is. See the server, the network, and the browser side by side for every page.
Slowest page this week. Backend time doubled after Tuesday’s release.
How long each page really takes for visitors, not for a test server next door.
Separate slow servers from slow pages, so the right team picks it up.
Carts, search, and filters load in the background. If those calls are slow or failing, visitors feel it even when the page itself looks fine.
The requests your pages make after loading, with timings and responses.
Errors that only appear with real data, real carts, and real accounts.
A geo chart shows where visitors are and how quickly the site loads for each region. Device and browser breakdowns show who is having a worse time.
5,820 page views
4,310 page views
2,950 page views
1,180 page views, mostly mobile
Real user monitoring and synthetic monitoring are not rivals. One shows the experience, the other raises the alarm.
Real sessions on real devices, sliced by page, location, device, and browser.
Scheduled tests in a real browser that catch a broken checkout at 3am, with no traffic needed.
Synthetic tells you something broke. RUM shows how many people it affected, and for how long.
Real user monitoring is priced like uptime. RUM checks share one allowance with uptime, SSL, WHOIS, and heartbeat checks, so mix them however you need. No credit card to start.
Running a production app? Essentials at $39.99 a month comes with a 14-day trial.
See every plan →Real user data sits beside the monitors that alert you first.
Run login and checkout in a real browser, on a schedule.
Synthetic monitoring →“They played a crucial role in helping us quickly onboard several hundred sites for both uptime and synthetic monitoring, providing invaluable support every step of the way.”
“The company I work for needed to transition to a new monitoring system for the many ecommerce sites we support, and Acumen has stepped in and filled the void in a terrific way.”
“Love the support we got from Acumen Logs! Highly recommended.”
It measures performance from the browsers of the people actually visiting your site: how fast pages load, how long the server takes, and how background requests behave.
Add a small JavaScript snippet to the pages you want to measure. On Webflow, put it in the site-wide custom code so every page is covered.
Page load times, backend load, time to first byte, largest contentful paint, and AJAX requests, broken down by location, device, and browser.
RUM shows what real visitors experience. Synthetic monitoring runs scheduled tests to tell you something is broken, even when nobody is visiting. Most teams use both.
Yes. RUM data comes from real visits, so quiet pages produce less data. That is where synthetic tests fill the gap.
The same as uptime monitoring. The free plan gives you 10 checks, and RUM, uptime, SSL, and WHOIS checks all count towards them. Solo raises that to 100 for $5 a month.
Yes. Any site where you can add a script to the page head can send real user data, Webflow included.
Instant checks, core monitoring products, and engineering resources.
Create complete synthetic journeys from a simple prompt.
Explore builder →One snippet, and every page view tells you how your site really performs.
