So if you want to find out what Facebook knows about you, you have to download your data from Facebook. It's a JSON dump which does very little on its own to inform you what all of it actually means. We wanted to make a tool to easily analyse and understand the data.

You upload it to Ethi, but your data is encrypted in your browser before you upload, stored encrypted, and only decrypted in a serverless cloud instance to analyse and process it (there's a lot of data analysis that happens) before being stored encrypted again.

So we can't see your data when it's stored, and it's encrypted nearly all the time except when it's being processed or you're viewing it.