Obsidian is free and you can sync using whatever method you'd like. The $10 is if you want them to sync your vaults for you, all while being end-to-end encrypte

Obsidian is free and you can sync using whatever method you'd like. The $10 is if you want them to sync your vaults for you, all while being end-to-end encrypted. I've paid for sync since beta (I'm locked in at a lower price) and I partly do it just to support the devs making such a good product.