robotbenchmark is a web service with a cloud-based 3D robot simulation software that provides a series of robotics challenges to researchers and students. Robotics challenges, including a performance evaluation metrics, are provided to the users. Users can program simulated robots in Python and run the simulation to evaluate the performance of their robot controllers. A ranking of the best performing robot controllers is stored for each benchmark, including a simulation playback capability. Researchers are welcome to contact us to add more benchmarks to this cloud service. Participation is free of charge. The added value for the researchers and students is the following: Ease-of-Use Realistic Simulation Software Relevant Robotics Challenges Comparison of Scientific Approaches The added value for the users is the following: Ease-of-Use Realistic Simulation Software Relevant Robotics Challenges Comparison of Scientific Approaches