You can now embed your Notion pages into your website! I used to pay for a tool for that, now it's free in Notion. Here's what it looks like on my website:

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How?

1. Click Share → Publish → Publish to web
2. Select "Embed this page"
3. Select whether you want to keep or hide the page title
4. Click "Copy Code" & embed it wherever you want to

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PS: You can always edit the iframe to better suit your needs. Default values will be width="100%" height="600" frameborder="0".