ApolloPad is described as 'Great online app for writers, novelists, and bloggers. Manage project timelines, outlines, characters, locations and objects, upload photos and reorganize it all as much as you need to. Contextual inline notes (including to-do items, photos, and videos) to help you keep your' and is a Novel Authoring tool in the news & books category. There are more than 25 alternatives to ApolloPad, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and SaaS apps. The best ApolloPad alternative is Scrivener. It's not free, so if you're looking for a free alternative, you could try bibisco or yWriter. Other great sites and apps similar to ApolloPad are Untold Novel, Hemingway Editor, Lore Forge and Gingko Writer.
This software has some great tools, including the Snowflake tool and so many others. Only wish there were an app I could download onto my phone/iPad. Great and worth taking a look at.