Show HN: Trajectory – an open-source educational tool to model financial future (opens in new tab)

Hey all, I wrote this little Blab after struggling to visualize the impact of budgeting and investments in the long term. People kept telling me to save and invest, but I wanted to see empirically why this is true.

Features I'd like to add:

  - Better taxation rules
  - Specific asset classes and investment accounts with 
    associated taxation, withdraw limits, and contribution limits
  - Investment allocation strategy with a changing risk profile 
    and tax conscious account allocation
  - Social security income
  - Highlighting the "important" factors 
    (i.e., the ones that impact the plot the most)
  - A probabilistic simulation to get a better result estimate 
    (i.e., confidence intervals)

If you want to contribute, that'd be awesome! You can also easily fork it. If you have questions, I'm happy to answer them here!

Blabr dev here. We're working on an improved plotting widget, plot2 [0], that you're welcome to try (note how it's imported in the defs section). For example, see [1] for plot2 applied to "Trajectory". It is fairly sound, but there are some issues with escaping. So, e.g., we need yLabels: ["\\$ $\\times 1000$"], which is a bit ugly--but it works.

[0] http://blabr.io/?7b662930a33b1053072a

[1] http://blabr.io/?7d4d0cc9f423800f23e9

Another Blabr dev here. This is a really nice blab. We'd targeted Blabr for scientific computing (and, in particular, for STEM and conceptual modelling), but you've demonstrated that it also works well for other kinds of online, interactive computation.

Based on your work, it occurs to us that we need to improve some things for non-scientific applications, e.g., number formatting (dollars/cents, thousands separators). Please let us know if there are any other features that would help you do this kind of financial modelling work. Or any feedback in general. Thanks!