Looking to try obsidian, but the sync seems expensive. Do you pay for sync, or are there other alternatives?

I have iOS, and use MacBook/Linux.

EDIT: Wow! It’s impressive how many different ways there are to achieve this. I tried obsidian git, but couldn’t get it to work as expected. Remotely Save is working perfect! Obsidian flew under my radar all these days because I thought sync was the only way. I’m looking into plugins and there’s literally a thousand plugins. It’s kinda overwhelming tbh. I’ll make another post for plug-in recommendations and workflow setup advice. Thank you all!