It's still a pup, but I've enjoyed Trello for as long as it's been around. It's a really great tool to learn as well as teach the benefits of a board to team members, colleagues, friends and clients.
In my personal experience, it's more of a Kanban system than something you'd setup Sprints with, however, it also seems like a wonderful way to make a public board that encourages contributions to your feedback and backlog that can then be planned accordingly on Jira.
Yes, lots of people use Trello for personal tasks. Check out these board templates for some inspiration :) https://trello.com/templates/personal
Regarding syncing, you can move cards between boards (https://help.trello.com/article/806-moving-cards-or-lists)
but making them automatically sync is a bit harder and requires some Butler automation (https://help.trello.com/article/1164-card-mirroring)
or you could look at this paid for Power-Up by Unito
Trello has a free tier, and is great for personal tasks. The one big downside is, at least last I checked, there was no way to drag cards between columns on Android. you have to click the move button.
See these links:
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