Comment by mertbio
2 years ago
I couldn't find an app that has clean UI and also doesn't collect any data for FIRE calculation, therefore I developed my own app and also put it into the App Store: https://apps.apple.com/us/app/firecalc-early-retirement-age/...
Also, developed another app to reduce my Twitter usage. The reason why I created this one is that even though there a lot of Safari Extensions out there, they can access to your Safari history but the app that I've developed can't because it is just a content blocker: https://apps.apple.com/us/app/not-for-me/id6451205605
For retirement calculators monte carlo simulations seem like the best way to model risk, but all existing implementations are several orders of magnitude slower than they should be. I made https://james.darpinian.com/money/ to prove that it's possible to simulate a million scenarios in a few milliseconds. You can drag sliders and see simulation results update in real time. Even on phones.
Because I made it for my own use, the UI is terrible. The simulation result you need to pay attention to is the % success at the bottom, which changes as you drag the sliders. The simulation assumptions are reasonable and sophisticated (more so than many existing FIRE tools, especially the use of actuarial tables) but not documented except in the code comments. It would be cool if one of the real FIRE calculators out there with a real UI would implement a fast monte carlo simulator like this. I'd be happy to share how it works.
That's cool! I'm planning to add Monte Carlo simulations into my app.
Do it on the GPU and you will be so far ahead of everyone else it's not even funny.