Website Monitoring, alerting, and analysis all in one place

Monitoring: page loads, AJAX requests, frontend errors, core web vitals, and more!

Alerting: Fix problems as they happen

Analysis: Dive deep into problem areas with RUM waterfalls and bounce analysis charts

Start now!

A Window to user experience

Monitor your website as real users experience it

Page speed and correctness has an impact on how users interact with your site. Slow page loads can cause users to leave your site. Our real user Monitoring (RUM) gives you a crystal clear view of your website. Whether you just want to ensure everything is ok or you need to find and fix issues quickly.

  • Keep track of page loads as real users see it.
  • See metrics about your datapoints via ajax requests
  • Uncover clientside errors on your website, at individual page level
  • Find bottlenecks with powerful filters to inspect all aspects of web performance.
  • See how many users leave your site when your site is slow to load!


Simple and solid gauges of user experience

Monitor Core Web Vitals from real user data!

The core web vitals as introduced by Google are a strong represenation of user experience.

They can also have an effect on your Google search ranking.

Alongside standard page load metrics, ajax calls, and errors, we measure Largest Contentful Paint, First Input Delay, and Cumulative Layout Shift in real time from real users, allowing you to monitor all aspects of user experience on your website


Screen Transitions

Does it work for Single Page Applications? Absolutely!

We use the concept of "screen transitions" for single page applications

Find out more about how our beacon works on our Single Page Applications page!


Browser errors

Shed light quickly on errors that are causing problems for your users.

Uncaught errors in browsers can mean terrible experiences for your users. Pinpoint the unhandled errors that users are experiencing by seeing which ones are happening most often.



Detailed Metrics

Easily pinpoint issues using combinations of browser, device type, dates, percentiles of users, and metric visualisation

See actual performance breakdowns by:

  • Browser
  • Device Type
  • Page Load
  • DNS Time
  • Network Latency
  • Time to First Byte (TTFB)
  • DOM Content Loaded
  • DOM Interactive
  • Redirect Time

dashboard filters


Straightforward plans that grow with your website or single page application!

$5 / mo


  • 5k sessions per month
  • 10 day history
  • 1 month free trial!
  • Cancel anytime
$15 / mo


  • 15k sessions per month
  • 30 day history
  • 1 month free trial!
  • Cancel anytime
$100 / mo


  • 100k sessions per month
  • 30 day history
  • 1 month free trial!
  • Cancel anytime


Take a look at our most recent blogs

July 9, 2021

Always watching for you - Introducing Alerting!

Part of running your website every day is knowing that things are ok. Websites experies outages for all kinds of reasons, and indeed as the complexity of the website increases, so too does the likelihood of something going wrong. Outages comes in all shapes and forms, unreachable DNS, 3rd party scripts misbehaving, failing AJAX calls, buggy javascript are just a few of the reasons. The symptoms can be truly diverse and more often than not it is something we hadn’t thought of (otherwise we would have a code path handling that case, right, right? more

June 10, 2021

Waterfalls made of RUM

Debugging frontend problems should be simple. The reality is it is not always straightforward. It’s a potentially stressful exercise, given that diagnosis usually happens because of an outage of sorts. Outages mean users aren’t happy, or we’re losing money or users, or both. Okay, so we know we’re stressed. Now we have to work with a mix of system familiarity, crossed with a logical, often robotic, exercise of looking for clues and excluding suspects until a root cause is found. more

May 19, 2021

Why did Nock not record all the api requests?

tl;dr Nock overrides http(s).request functions, which needs to be done before other code stores a reference to it. We ran into an issue where Nock wasn’t recording api calls to a new service dependency we introduced into the BytesMatter codebase. The solution eventually turned out to be quite straightforward, but investigating it taught us that sometimes code subtleties mean that tools are not always as straightforward to use as the “copy-paste” tutorials suggest. more

April 15, 2021

How does real user monitoring work?

Before answering the question “How does real user monitoring work?” let’s first make sure we have a baseline understanding. Real User Monitoring and Synthetic Tooling Broadly speaking, when monitoring or measuring websites there are two types of approaches to take: Synthetic Tools Real User Monitoring Synthetic tools will programatically measure aspects of your site. These tools can be set up to run ad-hoc or ongoing depending on your requirements. more

March 24, 2021

Performance Bounce - Beyond the 3 second rule

Let’s talk about performance bounce. tl;dr performance bounce is about users, single-number summaries (such as core web vitals speed index) are about seo ranking and benchmarking. These two concepts have overlap, but need to be separated. Beyond the 3 second rule The axiom that the likelihood of bounce increases beyond the 3 second mark has driven web performance into the business domain. Like every good movement, performance needed a starting point, and that was it. more

January 4, 2021

Performance Resource Timing, Cors, and AJAX requests

This is a quick summary of a caveat of cross-origin resource sharing (CORS) when measuring performance of ajax requests using performance resource timings in the browser. To be clear in this article we will unpack slightly some of the information from Mozilla’s documentation on the subject. Why? While it contains the root cause it does not spell out the consequence, which hopefully we’ll do here. Resource Timing API wait what?! The rise and influence of performance measuring and monitoring across the discipline of web engineering has meant the respective tooling has come a long way too. more

December 11, 2020

Diagnosing Website Issues - Part 2 - Let your systems tell you what is wrong

This is part 2 in a series about diagnosing website issues. Hopefully it gives us a framework to constructively and efficiently work through website outages or issues instead of working in a state of stress or panic. Thanks to Part 1, we know what it means to be in an outage. Everyone knows their place and we’re ready to figure out what on earth is going on. Now, obviously you’re not ACTUALLY reading this in the middle of an outage. more

November 13, 2020

Real User Monitoring vs Synthetic Web Performance Tools

Let’s start with an assertion: Web performance is important. You agree with that and that’s why you’re here. Both real user monitoring and synthetic web performance tooling offer ways to shed light on how your website is performing for your users. Which to use? Easy, they offer different views and are both important. A simple way to differentiate is tools measure and evaluate, and monitoring tracks trends and deviations. If I may insert a pedantic opinion here, the former is best suited to build time and the latter for your production website. more

November 10, 2020

Diagnosing Website Issues - Part 1 - Before we begin

This is part 1 of a series. As engineers we love building software. We love releasing software. We love seeing our software helping people. Diagnosing Website Issues is not always the first thing that comes to mind if we think about what we do day to day, but it is a real and critical part of our jobs. Unfortunately, sometimes things go wrong. Sometimes wrong is “just a bit wrong”. Those cases that can generally be filed under bug - fix later. more