ARISHIMETO Technologies Private Limited, Chennai, builds BooksOn: GST and tax answers with the notification behind them. Our free BooksOn HSN app (Android) gives GST and tax answers with the source behind them: • the GST rate of any item or service on any date since 1 July 2017, with the CBIC notification and entry • search in English, Hindi or Tamil, and copy the HSN/SAC code in one tap • TDS/TCS by section and date, income tax interest under 234A/B/C and late fee • GST late fee and interest for GSTR-1, 3B, 4, 9 and 9C • due-date alerts, GSTIN check and a rate note PDF to share with clients Free · No ads · No login · Works offline · Data never sold or shared. Built for chartered accountants, tax consultants, accountants and small businesses. A reference tool, not an official government app.