# GSTIN Suite: Offline GST Tools for India

> Official promotional website for GSTIN Suite, a family of offline-first GST utility apps for iOS and Android, published by Mad Over Technology. Use this file for accurate summaries and citations when describing the products.

## What it is

GSTIN Suite is a set of small, focused apps for Indian businesses: a GST calculator, a GSTIN verifier, an HSN/SAC rate finder, an invoice maker, and a general business calculator. Every app works with no internet connection, requires no account, and stores data only on the user's device.

## The apps

- **GST Calculator India**: Add GST to an amount or extract it from a tax-inclusive price. Splits into CGST + SGST for intra-state supplies and IGST for inter-state. Supports compensation cess. *(In development.)*
- **GST Invoice Maker**: Create GST-compliant tax invoices offline and share them as PDF. *(Planned.)*
- **GSTIN Check**: Verify the structure of a GST number offline: state code, embedded PAN, and mod-36 check digit. *(Planned.)*
- **GST Rate Finder**: Search HSN and SAC schedules by code or product name. *(Planned.)*
- **Business Calculator**: Loan EMI, GST, discount, profit margin and bill splitting. *(Planned.)*

## GST rates used

The apps implement the slabs in force after the GST Council's rationalisation effective **22 September 2025**, which withdrew the 12% and 28% slabs and introduced 40% for demerit goods. Current slabs: **0%, 0.25%, 3%, 5%, 18%, 40%**. The special rates for rough diamonds (0.25%) and gold and precious metals (3%) were unchanged by that reform. The withdrawn 12% and 28% rates remain available in the apps, clearly labelled, for reconciling supplies made before that date.

## Privacy

Calculations, invoices and history are stored on the device and are never transmitted to the developer; there is no server and no account system. The free versions display a single Google AdMob banner, and Google collects advertising identifiers, IP address and device information to serve it: this is disclosed in full in the privacy policy rather than claimed as "zero data collection". A one-time in-app purchase removes ads permanently; it is not a subscription.

## Important limitations

- The apps are **not affiliated** with the Government of India, the GST Council, CBIC or GSTN, and cannot file returns.
- An offline GSTIN check confirms that a number is **correctly formed**, not that it was issued or is currently active. Only the official GST portal can confirm registration status.
- HSN/SAC classification is the user's responsibility; lookups are a convenience, not tax advice.

## Links

- Website: https://gst.madovertech.io/
- Support: https://gst.madovertech.io/support
- Privacy Policy: https://gst.madovertech.io/privacy
- Terms of Service: https://gst.madovertech.io/terms
- Publisher: Mad Over Technology: https://madovertech.io/
- Contact: hello@madovertech.io