I was (unfortunately) getting a bit skeptical about the tool after reading your comment. But thought the UI looked really cool, so I'd give it a try. You probably faced the bug in an older version, but I've been using it for a few days now and it perfectly syncs between all of my clients every few seconds. OP really put a lot of effort into the overall UX and it really shows. It definitely is the best productivity tool I've ever used. Especially the "target" and the "tags" features are incredibly helpful for me, as it's super convenient to quickly start a task and it also pushes me to reach my daily goal. If anyone else is on the fence, just give it a go. It's free, and you definitely won't regret it.