I was asking a similar question a few months ago, and my search turned up Joplin. It’s a free, open source app that works across multiple platforms and can sync data through a cloud service, either through Joplin’s own cloud storage or through a third-party cloud storage like Dropbox.
This is awesome! I recently switched over to Kagi because of several Lemmy posts mentioning it as an alternative. However, I really appreciate you sharing your preferred SearXNG instance. I have it added to my browser’s list of search engines and may switch to it from time-to-time to see how different it is from Kagi. If there really isn’t much of a difference, then I may switch to it after my Kagi membership ends.