Absolutely. Emovart reads your content through Notion's official API, which behaves exactly the same on Notion's free plan as on the paid ones. Syncing, both layouts, search, the widget — everything works identically.
Notion's free tier is generous for personal use, so a solo founder can comfortably run a complete knowledge base on it. You'd only upgrade Notion if your own team needs Notion's collaboration limits lifted — Emovart itself never requires it, and no Emovart feature is gated by your Notion plan.