Opera developer allows early testing of new features, mainly targeting developers, extension creators, and early adopters. Opera developer is not intended for everyday browsing as it is unstable and is prone to failure or crashing, but enables advanced users to try out new features still under development, without affecting their normal installation of the browser. New versions are released frequently, generally a few times a week.
Opera beta is a feature complete phase, allowing stability and quality to mature before the final release. A new version is released every couple of weeks.
Both versions can be installed alongside the official release without interference. Each has a different icon to help the user distinguish between the variants.
