In this video, Mark McGee tests a new iPhone app for creating time-lapses called ReeLapse. As McGee explains, part of the reason that standalone cameras — whether mirrorless or DSLR — produce better time-lapse videos is often mostly due to how you can drag the shutter a little. This blurs any noticeable movement in the frame, and as a result, instead of the janky darting around the screen you get on your phone's default camera, you get a sort of fluidity.
McGee does several comparisons in this video between the base iPhone camera app which has a setting for time-lapses, and then this ReeLapse app, and it's hard to argue the difference isn't profound. I would also argue that having this capability on your phone is useful because time-lapses typically tie your camera up for a while, if not hours, prohibiting you from shooting unless you bring a second body. I can imagine this would also be great for behind-the-scenes work on shoots.
Have you ever created a time-lapse on your phone? Are there any rival apps to this worth looking at?