AdBlock 4+

You can’t beat this app, it’s a necessary item to enjoy these devices and well worth the $$!! People you have problems must not have it set up correctly and thus not working as intended. Thanks Developers

You need to add dns proxy rules for it to do that. YouTube ads can’t be blocked though since doing that would disable the video player.

This works as intended - for those that don't understand how it works, should look up DNS blocker files or websites to import DNS host-file batches from. I have over 100k websites added, and it works a charm, all locally, and across even in-game ads that fetch from websites too. (Including annoying banner ads).
Only ones that it doesn't block would be the type that you can't block via a address/DNS, but that's a given obviously, and no adblocker app can block non-address ads (such as built-in offline ones for a game's other products) anyway.

The bad news is I definitely see a heavy battery usage (check Battery in settings) by the app, and it definitely puts strain on the phone by comparison to something such as NextDNS, which has a much lighter hand for battery usage, so far it seems.
I would say it cuts about 30-40% of my normal battery usage, which for a regular user like me, is pretty sucky.

If this was the only one available, I'd bear with it, but NextDNS's 100k queries a month free plan might work fine for me, and it'll drain less on my phone. Worst case scenario I use this app for the few days the NextDNS runs out.

I'm not sure why this makes the battery drain faster by blocking loads - you'd think that would make it drain less battery, by the claims of many other ad-blocker apps I've seen (of which I've passed over - 98% of them are safari extensions and I don't use safari) so I'm not sure why this one chews my battery so much.

Interestingly even going from Disabled to Enabled, that loading bit as it turns on the settings, eats about a 5-8% and makes my phone battery heat up as the battery jumps down - no idea why, but it's weird. Then once it's on, the battery usage is accelerated by 1.5x-3x the amount.

Long review, but it does exactly what it says for being able to locally block domains via VPN settings (not compatible with VPNs btw! Turning on a VPN disables this, unlike Lockdown, but Lockdown sucks because you have to manually add addresses to block 1 by 1, and has a paywall for their own rather paltry list of to-block domains, which you can find better lists online anyway)
You can also import lists from host files and online sites (but can't do so from a local host file or text file on your phone which is weird to me)
The downside is the heavy battery usage, and the fact that unlike NextDNS and Lockdown, it locks VPN settings to only be usable with itself.
If those two things could be changed or improved upon, that would make this app by far the best imo, and well worth anywhere from 3-10 dollars for the functionality.

The heavy battery usage however makes me limit this to a 3 stars, as it's a rather chunky cost for what it does, in such a way I don't quite understand why it strains the battery the way it does.

That's all I have to say. Cheers.