Find out how many visitors your website can handle before it slows down or starts failing. Send thousands of requests at once, see the response time of every request and compare the results after each change to your code, cache or hosting.
Measure TTFB and the full response time broken down into DNS, connection, TLS, server wait and download. More about the Response Time Checker
Free and without registration. The check is made from our server, so the timings include the network distance to it.
A load test sends many requests to your website at the same time, the way real visitors do during a traffic spike. It shows how the response time changes under load and at what point the server starts returning errors, so you can fix the bottleneck before your visitors find it.
Start low (10-20) to get a baseline, then increase the concurrency step by step until the response time grows or errors appear. That point is the real capacity of your website. Compare it with your peak traffic: a sale, a newsletter or a campaign.
A load test with hundreds of concurrent connections looks the same as an attack for the website that receives it. Ownership confirmation makes sure nobody can use Siteload against a website that is not theirs.
Yes, while the test runs your real visitors share the server with the test requests. Run big tests at a quiet time or against a staging copy of the website, and increase the load step by step.
Yes. Load tests, uptime monitoring and SSL certificate monitoring are free, and no credit card is needed.
Test how much traffic your website handles, get an email when it goes down and never miss an SSL certificate renewal.
Run a free load test