We recently open sourced our tool for Selenium testing called Callisto, so we wanted to share our experience with its development and usage.

Say no to Selenium Grid

Callisto is an open-source Kubernetes-native implementation of Selenium Grid.

We had previously been using Selenium Grid, but the experience wasn’t always great.

Selenium Grid has critical downsides:

  1. It demands a lot of computational resources, but there’s always a chance of stability and reliability issues.
  2. Selenium Hub (the part of Grid) can be an infrastructure bottleneck; it stores sessions/nodes mapping and forwards requests from a test to an appropriate node. …

Vitaly Markov

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