That $89 Amazon purchase could have been $1,200 in SPY/VOO.... Chrome extension that turns impulse buys into ETF opportunity cost!

That $89 Amazon purchase could have been $1,200 in SPY/VOO.... I should have stop buying thing on Amazon to be on FIRE... SoI built Road to FIRE, a free open-source Chrome extension.

The idea is simple: before checkout, it shows the cart total as opportunity cost, like:

“This could be ~0.20 shares of VOO/SPY instead.”

I built it because my FIRE problem was not one huge purchase — it was a lot of “it’s only $40” moments adding up.

Privacy-wise:

• no account
• no tracking
• no backend
• no data collection
• everything stays in Chrome local storage

I’m looking for feedback from other builders:

1. Is ETF-share framing useful or too gimmicky?
2. Should I add modes like future value, hours of work, debt payoff, or emergency fund?
3. Any UX/privacy concerns with this kind of extension?

Try 10 secs to install on Chrome Web Store!
https://chromewebstore.google.com/detail/road-to-fire/ljlhkgcnmnjkhcicjmcdebkbcmagiaef

GitHub:
github.com/jasonroy7dct/Road-to-FIRE