I've been working on something like this. Super simple, like an Spreadsheet of what you read but as a SaaS. I was thinking in monetize it a là Pinboard: focused

I've been working on something like this. Super simple, like an Spreadsheet of what you read but as a SaaS. I was thinking in monetize it a là Pinboard: focused on privacy. Like, $3 per month and you have it, without Amazon or Google knowing what books you read and how you rate them.