For android, since you didnt specify. I love eternity. I used to use infinity for reddit and its just a fork of that. Its clean, minimal, and crazy customizable.
Ditto
Eternity is great
It's UI is my favourite amongst the apps I've tried out
Boost is my favorite. Clean UI and attractive icon.
I assume you got voted down because Boost isn't FOSS, which is true. But it's still good.
I moved to Boost from Sync (also not FOSS) when it began to look like the dev had abandoned Sync. Boost felt like the closest app visually and in using it.
I'd prefer something FOSS, but inertia is real and I'd been using Sync for a long time.
Avelon was great for iOS. I'm using Android now, and Summit is great.
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