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Rocky Panda

We build small, free web tools that do one job well, with data checked against official sources.

Our tools

SellerFeesVerified fee calculators for eBay, Etsy, Depop, Poshmark, Mercari and Whatnot.TankMatesAquarium fish compatibility checker and stocking calculator for 72 freshwater species.ApplianceWattsAppliance wattages, electricity cost by state, a power station / generator calculator, and solar panel sizing by state.TireMathTire size calculator and comparison: height, width and speedometer difference, with makers' published diameters.CarTaxCar sales tax, title and registration fees for 16 states, quoted from official state sources.MarketMovesDaily cross-asset market tracker: stocks, bonds, commodities, currencies and crypto over 1 day to 1 year, with a written read of each period and a dated archive.