Neither this nor the alternatives in the replies to you mention anything about moderator tools.

Even the official reddit mobile app only finally got things like viewing mod queue, and approve/remove/spam, very recently. Which means until recently using the actual site on my phone was the only way I could use reddit.

This may seem like a niche request, but it holds back the ability of moderators to use reddit mobile apps, and in turn prevents that class of "power users" from being able to recommend an app to friends.

(and even the site itself isn't great; on desktop I use multiple browser extensions to add functionality reddit itself should be providing)

Readder does have mod tools but I'm not sure how in depth or good they are since I've never used them.

I actually vastly prefer Readder over Apollo. Check it out: http://readder.co/

100% agree with that. Switched from the official app over to Apollo a few months ago and haven't looked back since.

The gesture-based functionality and the media viewer alone make it way better than the offical app.

Does it show ads?

Nope, well except the standard Reddit posts that are obviously ads...

No ads. It's monetized via in-app upgrade to Apollo Pro.