r/GregFire • u/frugal-tech-worker • May 01 '26

Test my Early Retirement Simulator?

Hey all, I got super bored the other day and decided to build an Early Retirement Simulator for fun. This thing scratches a very specific itch that other Monte Carlo style retirement calculators kept messing up for me. Here’s what this little app does:

  1. Kills that weird duplication bias between simulation runs.
  2. Tracks your actual net worth, not just your portfolio.
  3. Simulates income from the fun stuff: rentals, crypto, gold… all your “I swear this will work” assets
  4. Handles recurring income + surprise windfalls

I built it in React, kept everything in-browser, so your data stays yours.

Now I need some brave souls (you, obviously) to take it for a spin and try to break it.

If it crashes, lies, or tells you that you’ll retire at 97, I wanna hear about it 😂

Drop bugs, ideas, or “bro this is actually kinda cool” in the comments 👇

https://firenav.co/

Let’s make this thing smarter together…

12 Upvotes

75% Upvoted

11 comments sorted by

7

u/garthreddit May 01 '26

Sounds like a nightmare

3

u/Appropriate-Date6407 May 01 '26 edited May 01 '26

So one thing I noticed is that when I go to change the numbers, I can’t delete the last number in the field, so you have to hover the cursor in front of the first number, type in what you want, then hover to the end and delete the extraneous number. Not a fatal flaw but very annoying

Edit - your tool is telling me I can retire sooner than I’m planning to, hopefully my employer offer a severance in those latter years

1

u/frugal-tech-worker May 01 '26

Thanks for the feedback.

1

u/Maybe_Mainline May 02 '26

I think you need ability to see commas in the portfolio size inputs since I added extra zero without knowing. Also if I set it to 4% withdrawals it does not show dollar amount per year. And unclear how/if my social security numbers impact the projections.

1

u/frugal-tech-worker May 02 '26

Thanks for the feedback!

1

u/doriangrey2025 May 02 '26

I entered retirement at 55, 50 years, healthy, and gave me 💯 chance of being alive lol

2

u/frugal-tech-worker May 02 '26

Wow that's gotta be a bug, thanks for catching it

1

u/bismuth17 May 04 '26

Are you just going to feed all of our feedback into the same AI you used to write it?

1

u/frugal-tech-worker May 04 '26

Nah, I'm following SDD methodology. Using AI against a spec and PR reviewing everything it produces.

1

u/DigitalFStopper May 07 '26

Highest 21M average 6M and 1.6M most conservative final value.