I, too, abandoned Sync after paying for it. I've come to despise the dev and the app. He'd do things like release breaking changes then disappear for months. Markdown never worked right because it used Reddit style markdown for things like superscript, etc. And one day he decided to add markdown to post titles with horrible results, and no way to disable it, then disappeared again.
At any rate, I switched to Thunder and I'm perfectly happy with it. It's customizable enough, and I guess I'm ok with the things I can't customize. I also tried a bunch of apps, and Thunder was definitely the best.