Overall winner

Elsevier Reviewer Badges and Rewards scheme by Simon Gosling

Runners up

Top Reviewer Incentives by Michael Muthukrishna
Peer Review Annotation Application by Koen Hufkens

Commenting prize draw

Those who have won one of five $50 Amazon vouchers in the prize draw have been notified by email.

We will now begin to work on the winning ideas in cooperation with the winners.

Thank you to all those entrants and commenters who have taken part in this challenge!