Free security check
Threat blocker test & speed test
Check with a single click whether ads, trackers and analytics scripts are reliably blocked, and measure the real speed of your internet connection.
Threat blocker test
How good is your threat‑blocker?
Browser, extension, VPN or DNS filter: the test checks 132 known advertising, tracking and analytics targets and shows how many of them are blocked.
Note: for the test, your browser calls up known advertising and tracking addresses. Requests that are not blocked will reach the respective providers. The test only starts once you click.
Speed test
How fast is your internet? Ad-free with us
Measure the current download and upload speed of your internet connection – separately, with a single click and, with us, completely ad-free.
For an accurate result, pause other downloads, streams and video calls during the measurement. On Wi-Fi the result is usually lower than via cable. Measurements are taken against Cloudflare’s test server, or alternatively against our own server.