GrevityOffline GST Billing & Inventory Software

01

Problem

Indian manufacturers and traders needed GST billing that works with no internet and no server.

02

What I built

I built Grevity, an ASP.NET Core (.NET 10) app with multi-company tenancy, GST invoicing that moves from Draft to Quotation to Order to Invoice, bill-of-materials production, live stock, party ledgers, payments, reports with Excel export and full audit logging.

It ships as a WinForms + WebView2 desktop app that runs entirely off a USB pendrive on SQLite, protected by RSA-signed, hardware-locked offline licensing.

I also built its marketing site and 3D promo video.

03

Stack

• ASP.NET Core
• C#
• Entity Framework
• SQLite
• Tailwind CSS
• WebView2