Load testing with real browsers
Your users shouldn't be the load test.
Your site works fine with a few visitors. But what about 500 at once? Simulate their visits and find the slow pages before they do.
Trusted by the teams behind
Load testing with
real browsers
Script a visit once — open, type, select, click — then run hundreds of simulated sessions through it and see exactly which page or step gives out first.
See the slow step before your customers do
Every session runs in a full browser, so you measure what people actually experience, not just how fast a server answers.
Tests that stop when your site gives up
Pick an error threshold. Cross it and the run winds down on its own.
- Fresh numbers every few seconds while it runs
- A separate threshold for each test
- Sessions already in progress can finish
Every page, every step, side by side
Load time, TTFB and LCP per page; time and errors per step. Nothing slow stays hidden.
Catch the release that got slower
Daily, weekly or monthly runs
Connect your site and start testing
Add a DNS record or meta tag to verify your site. No agent to install.
Made for teams who ship on Fridays anyway
Real browsers, in the cloud
Each session runs in a full browser on our machines, not yours.
Web Vitals per page
Load time, TTFB and LCP, rated against web.dev's limits.
Failed requests
Every failure listed with its status code and the step that hit it.
Step-level timing
Time and errors for each step of every scenario.
Schedules
Run daily, weekly or monthly and compare every run.
Alerts where you work
Results by e-mail, Slack or webhook.
Verified domains only
Tests run only against domains confirmed via DNS or meta tag.
Full run archive
Past runs keep their results and settings for later comparison.
See every feature. Running a store? Read how to load test an ecommerce site before Black Friday.
Every session runs in a real browser on our machines, so your office network is never the bottleneck. Your site is.
Pay for the time your sessions use
Usage is the total time used by all sessions, measured in virtual-user hours (VUh). You’re billed for actual usage.
From sign-up to first run in minutes
Verify your domain
Add a DNS TXT record or a meta tag. Tests only ever go to domains you've verified.
Describe one visit
Open pages, type, select, click and wait: the same path a real customer takes.
Start the test
Run it now or on a schedule, and get results by e-mail, Slack or webhook.
Find yours on a quiet Tuesday, not on launch day
Start free. Your first test can be running in a few minutes.