After I saw Gina Trapani's "Life in Weeks" last week I got the idea that letting anyone make one would be a cool product. I've been working on this off and on for the last week, and have gotten it good enough where I'm ready to get feedback. You can add "Periods" (colors) as well as "Events" to your timeline. You can also record longer details that show up on hover, automatically add world events, and export/import the entire thing to a file.

Happy to answer any questions about the app or build any feature requests in near-real time!