By 2010 I had been program chair 20 times, served on program committees of 100+ international conferences and on editorial boards of 7 journals. I believed I knew everything about running a conference and reviewing. I was wrong.
Modern EasyChair encompasses a much larger amount of knowledge based on the feedback from thousands of conferences and different communities. It is the system designed for its users, because the main designer is also one of its main users.
Andrei Voronkov (CEO of EasyChair, Professor at the University of Manchester and at TU Wien)

The system is great. Very intuitive, very powerful.
Kurt Mehlhorn (Vice President, Max-Planck Society)

Thanks as always for the great system. What would we do without it?!?
Manuel Hermenegildo (Director, IMDEA Software Institute)

After using EasyChair, one dreads the thought of running a workshop or conference any other way
Úlfar Erlingsson (Microsoft Research)

As you know, I consider EasyChair critical to the success of FLoC. It would be impossible to manage so many papers, programs, and proceedings without the support of EasyChair.
Moshe Vardi (Professor, Rice University and Editor in Chief, Communications of the ACM)

EasyChair is a great system. Without it, I would not accept the invitation to be a program committee chair.
Tetsuo Ida (Professor, Tsukuba University)

Terrific from beginning to end.
Pascal van Hentenryck (Research group leader, NICTA)