Outlier have partnered with the University of Pittsburgh to make their courses regionally accredited. This means that their courses are very likely to be accepted at every university in the country that accepts transfer credit.
You should still check with your academic advisor or registrars office to confirm that credit earned through Outlier will be accepted.
Outlier have credited this detailed document which walks you through the process of transferring their credit into your degree.
Classes through Outlier are asynchronous, but they are not entirely self-paced. You have the option to choose between a 14 week or 7 week course schedule, and the courses have fixed start dates, although those dates a very regular.
If you're planning to take these courses while traveling, we recommend signing up for the 14 week schedule.