Plenty of disciplined traders built their process in a spreadsheet first. The honest question isn't whether it can work, it's what it depends on to keep working.
A spreadsheet is free, fully customizable, and can absolutely work for a trader who is already consistent about logging and reviewing every trade. Its limitation isn't a lack of features, it's that it's entirely passive: it only shows what you choose to enter, on the days you choose to enter it, with nothing built in to catch a risky decision as it's happening. PnL App automates the capture and adds real-time behavioral flags a static sheet simply can't provide.
If you've maintained a spreadsheet consistently for months and it's working, there's no urgent reason to switch. If your spreadsheet has three weeks of entries followed by a gap, followed by another three weeks, that gap pattern is itself useful information, and it's usually a sign the tracking needs to require less willpower to keep up, not more.
“The best tracking system is the one you actually keep using after a bad week.”
PnL App captures trade context automatically and flags risky patterns in real time, so the tracking survives the exact weeks a spreadsheet usually gets abandoned.