This has a lot of similarities to notion, but I went for this because of the lifetime deal, of course. Definitely don't pass this up. With their focus on AI integration, and continued improvement, I'm betting that they'll be a contender with Notion before too long.

The unique aspect is the focus on and ability to add all of your "apps" (ie: web tools) in one place. Definitely addresses that need, and from my testing, doesn't cause any lag for the embedded apps. I added Motiff, for example (similar to Figma), and was able to use it directly within LiftOS with no lag.