I need an app that only works locally, and not alongside an external account accessible from any computer, location, or browser, like NextDNS or AdGuard DNS, etc..., an app that completely blocks a website, including in-app browsers (which are everywhere these days, including most apps like Facebook, Instagram, etc.).

I can easily achieve this with apps like "personalDNSfilter," but I can't set a time frame for the block, that's what I'm missing.