Any details about the backend/implementation?

shameless plugs for two similar projects(open sourced both) I did a while back 1) Algorithmic Summarizer: https://github.com/mohaps/tldrzr 2) Readability Clone / Article Body Extractor with summary, significant image and text : https://github.com/mohaps/xtractor

Both are deployed on heroku and the urls are in the github readme files.