I am learning to trade forex, and one thing that is paramount to success is to backtest, journal your trades and analyse the data you come up with.
Most people do this in excel spreadsheets or by using one of the stale options on the market - the majority of which have extremely bad UI/UX and/or are ran entirely locally and can't be accessed from another computer.
Fed up with this situation I decided to create one for myself, originally it wasn't going to be a project that I released, but other people took interest in it and I liked where it was going, so committed to release it.