Chronos for Jira is an app to track time spent on Jira issues. It is built with React Native and will soon be available for MacOS and Windows. The project is still in development, we got an open beta for MacOS though. You can join the beta by following the instructions here.
Sometimes the dev environment will not start after updating packages or other external dependencies. The reason for that is that multiple caches have to be cleared and some of those don't get cleared automatically. To fix this issue, run the following command:
npm run clear-cache