For the record - here they are alpine.js (https://github.com/alpinejs/alpine) and synergy.js (https://github.com/defx/synergy) repos.

Thanks for your question. I'm not overly familiar with Alpine but yes, the syntax is very different. Alpine appears to freely mix JS and HTML whereas Synergy minimises this in favour of a clearer separation of concerns.

alpine syntax looks very different from a quick glance at the readme.

very angular-ish, template heavy with it's own syntax.