PieTrust is a secure reputation system for sharing credit. PieTrust can be used to help projects reward contributors, to allow people to rate each others' skills on social networks, or as a reputation system that can be integrated into other websites. The core of PieTrust is a collusion-resistant algorithm (implemented as a web service) that takes peer evaluations as input, and produces as output a reputation score ("PieShare") for each person. The PieShare reputation scores can be used in various ways:
Need a reputation system for your website?
Our system allows your users to evaluate each other, and produces a reputation score for each user via our simple API. Unlike simple averaging of user evaluations, our reputation formula is resistant to collusion and shilling; unlike "likes", PieTrust is resistant to reputation inflation.

PieTrust is flexible; it can allow users to evaluate each other along multiple dimensions, and can produce multiple reputation scores that measure different aspects of reputation. You can easily add our system as a component of your website by using our API. We are developing a number of reputation algorithms and we will help you select and tune the best one for your situation. Our reputation analytics platform allows you to efficiently discover more about your customers and their relationships.

Contact us today if you would like to use the system:

Join us!
PieTrust is an open project. Please email us to get involved.

Find us

at these events: or online at:

@pie_trust on identi.ca, Twitter.

PieTrust and PieShare are our trademarks

Contact us

See our FAQ, or, to get in touch with us, email: