onGST Calculator is a free suite of 3 GST tools for India: a GST calculator (add/remove GST with CGST, SGST, IGST breakdown), a Late Fee & Interest calculator, and an ITC calculator that flags blocked credits under Section 17(5) before you file. No signup, no ads blocking the tools, built for freelancers, small businesses, and accountants who need quick, accurate numbers without digging through GST portal menus.
