What is Guttenberg?

Guttenberg is a bot that searches for plagiarism or duplicated answers on Stack Overflow. It's currently running in SOBotics under the user Guttenberg.


Every 60 seconds, Guttenberg fetches the most recent answers (the "targets") on Stack Overflow. For each of these answers, possibly related posts (for example answers to related questions) are collected. All those posts will be checked for different characteristics (such as the Jaro-Winkler distance of the posts). If at least one of the characteristics meets the requirements, a message like this will be posted in chat:


The feedback (k/tp or f/fp) will be stored on CopyPastor, where you can also compare the target and the original.


We are already collecting data with CopyPastor to provide statistics, but since there are not that many posts to report, it will take a while until we have enough data. (approximately 6-8 weeks)

Special feature for moderators on Stack Overflow

In one of the latest releases, Petter Friberg has implemented the checkuser-command, which is available for moderators and room-owners. It checks all posts of a given user for plagiarism. In addition to the usual check via linked/related-posts, this command uses Google to find other sources where the user might have copied code or text. (we have a limited quota of 100 requests/day)


The code of the bot is available on GitHub. Feel free to open an issue, if you have an idea to improve the bot or found a bug. Please read this, if you want to contribute.

Continuous integration

Every GitHub release/tag will be automatically deployed to my server and Guttenberg reboots for the update.

Current version: 1.0.0

Build Status

You must log in to answer this question.

Browse other questions tagged .