Second opinion fetches Google Optimize A/B experiment data and calculates significance using other A/B test calculation sites
If you are in need of a second opinion for your Google Optimize A/B experiments (for whatever reason), this extension fetches your experiment data and performs the calculations with other well-known statistical significance calculation sites: ABTestGuide and Evan Miller's. The extension embeds iframes on Google Optimize's page so that you can compare calculations side by side. Just click on the extension button every time an experiment is refreshed to refresh the calculation. Only works for A/B test, not multivariate.