There are several differences: - Readup is universal. As a content creator you don't have to opt in by creating an account or adding new metadata to your site.

There are several differences: - Readup is universal. As a content creator you don't have to opt in by creating an account or adding new metadata to your site. You can send me a link to a blog post you published 5 years ago and after I read it using Readup you'll have a balance in our system. - Readup is specifically focused on reading articles. This means content creators get paid only when an article is read in full vs. a time-on-page metric that the Web Monetization API and other services like Flattr use.