CSROI review — Case opening + Armory ROI calculator with arbitrage scanner.

CSROI is the de-facto standard for "should I open this case?" math. It pulls live Steam Market prices for every drop from every active and discontinued case, weights by drop probability, subtracts Steam fees, and surfaces the expected return of one opening. The same engine drives a comparable view for the CS2 Armory rotation. A separate page tracks cross-marketplace arbitrage opportunities. The site is free, fast, and updated frequently. Its main weakness: limited explanation of methodology and no historical charts — you see today's number, not the trend.