Anyone can ship a trading app in a weekend now. What they cannot ship is the eight years of selling puts and covered calls that tell you which details actually matter.
Option Journal exists because every tool I tried got those details wrong. Rolls recorded as unrelated trades. Collateral nobody tracked. And my own broker export filing assignments as plain expirations, which quietly reported my assignment rate as 0% after dozens of real assignments.
Those are not hypothetical bugs. They are the ones I hit in my own account, and fixing them properly is what this app is.