The CAPTCHA app that in already part of the Jira software is very hard to read. I have seem the Font download workarounds, but I'm not having an issue with weird symbols, just with the letters being so close to each other that they are hard to read. I have searched the market place for other CAPTCHA apps, but there doesn't seem to be any in the market place. I am wondering if Atlassian has a recommendation for non-market place CAPTCHA apps which will work with Jira products. We use the main Jira Software, the Jira Service Desk and Jira BitBucket.