KeexyBox's forum

Can I install and use it in pi zero. Is 512 ram sufficient to run it.

I have no feedback running KeexyBox on Pi-Zero, but 512 GB of RAM should be enough to run it.
Mine is currently using 431MB for 10 connected users/devices and a Blacklist containing 2 million domains.

I recommend you install KeexyBox with the installation script:
https://wiki.keexybox.org/doku.php/insta...ion_script