I don't know of an off-the-shelf one you could buy. For the tinkerers, https://dontvacuum.me/ https://dontvacuum.me/ and dustcloud/dustbuilder as search terms.

I don't know of an off-the-shelf one you could buy. For the tinkerers, https://dontvacuum.me/ https://dontvacuum.me/ and dustcloud/dustbuilder as search terms. I have a roborock(Xiaomi sub-corporate brand) firmware flashed to no longer need internet, hosts "the database" on itself which is great for latency/responsiveness, provides web page functionality so you can use it from your phone, computer etc. I quite like it.