Why Block

See what's broken on a site and which privacy control caused it: browser shields, content or script blockers, or your DNS filter.

Why Block explains why a website isn't working properly. When a page loads without its styles, a video won't play or a button does nothing, the cause could be your browser's built-in protection, a content-blocking or script-blocking extension, a filtering DNS service, your network, or the site itself. Why Block watches the page load and tells you which one is responsible, what it broke, and what you can do about it. It doesn't block anything itself. WHAT IT DOES • Plain-language answers: a short headline says what's wrong and what to try, whether or not you use any blockers. • Shows what's broken: layout, interactive features, video, images, embeds and sign-in forms, rated from "Broken" to "Blocked as intended", so you can tell real breakage from tracking you're glad to lose. • Names the likely cause of each blocked request, with a confidence level. • Spots blocking on your network (router, DNS settings, security software or a workplace filter) and problems with the site itself, such as server errors and broken certificates. • Works with your filtering DNS service: connect it in Settings to see which rule blocks a domain and add an allow rule in one click. • Confirms the culprit with an optional test that you start and confirm: it briefly pauses your blocking extensions one at a time, reloads the page, and switches each one straight back on. • Checks whether a domain is safe: one click gives a combined verdict from security filters, reputation services and threat blocklists, including lists you add yourself. Checks run only when you ask. • Backs up and restores your setup in one password-protected file. PRIVATE BY DESIGN • No analytics, no accounts, no servers of ours. Nothing is ever sent to the developer. • Domain names (never full addresses or page content) go only to the services you switch on. • Optional API keys stay in your browser and can be encrypted, unlocked with a passkey or passphrase. • What a tab loaded is kept in memory and cleared when the tab closes. Supported tools and services: https://whyblock.me Privacy policy: https://whyblock.me/privacy Why Block is independent and isn't affiliated with or endorsed by the makers of the browsers, extensions or services it works with.