smartphone app for showing pace vs. previous rides?
In racing videogames, this is called a "ghost car", but ghost bike already has a meaning and "pace" isn't specific enough for searches.
I ride the same routes a lot (long commute) and would like a real-time display of how I'm doing compared to my pace at the same point on the route on previous rides. I want to try to ride a few % faster every week, but I need to know when I'm lagging as I'm going, not at the end.
If I have to write this myself, I'll add an adjustment so I can ask for things like 90% of fastest on a hot day.