The user interface is totally non-Mac. But it is also totally self-explanatory. I have used SingleFramer for both animation and time lapse. The onion skinning is very nice. The time lapse is wonderfully flexible, allowing rate changes and manual shooting of frames at will, which is quite helpful on processes that proceed at variable rates, like flowers growing and blooming. The program is light, simple, a joy to use. I will, as the program itself advises, distribute it freely.