Just another alternative suggestion, interstellar. I often rotate between summit and interstellar and really like them both. The only problem with interstellar i have found is its graphic design. Posts have no clear definition so it just looks like a blob wall of text and pictures. Pretty functional despite it's graphic design.
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I also eventually moved off Sync after a complete lack of development. I haven't tried Summit, but recommend Thunder. I've been very happy with it.
Edit: Just tried Summit. I personally still prefer Thunder.
I'd recommend using Summit over Sync, looks pretty similar and it is highly configurable, with much more active development than Sync: last Sync update was March 2024, more than 1.5y ago.
I also swapped to Summit from Sync and agree that they can be made to look quite similar. As a nice bonus, the dev is not only active, they're super communicative as well!
I've tried Jerboa and Connect in the past. They don't look the same, but they're both nice options for someone who feels like browsing around.