Privacy Policy

Last updated November 11, 2026

Contractor Saathi, operated by Shahnawaz, provides GST and performance guarantee (PG) calculators at onempa.com. Both calculators are available as a guest.

Google sign-in

If you sign in, Google and Firebase Authentication provide your account identifier, email address, display name, and profile photo when available. Saathi uses this information to verify your identity, show your account in the menu, and associate saved data with your account. The same session works across both calculators.

Company details and calculations

When you save a company profile, Saathi stores the company name and any address or logo you provide in Cloud Firestore. It uses those details to display company branding and include it in GST reports.

While signed in, GST History syncs calculation details you enter, including work information, amounts, and supplier bill entries. If you import earlier calculations, the selected records are copied into that history. Guest GST calculations run in your browser without syncing to an account. Custom PG rules are saved in your browser.

GST PDFs are generated in your browser. If you use your device’s share option, the app or recipient you choose receives the PDF and the information it contains.

Cookies, browser storage, and service providers

Saathi uses a session cookie and browser storage to keep you signed in. Your browser may also keep a local copy of synced GST history and remember your PG rules and whether you dismissed the install prompt.

Google Firebase provides authentication and cloud storage for company profiles and GST history. The hosting provider processes web requests to deliver the site. Google’s handling of data is described in its privacy policy and Firebase privacy documentation.

Your choices and contact

You can edit your company profile from the account menu and delete individual saved GST calculations from History. Signing out ends your session. Clearing this site’s browser data removes local settings and cached data from that browser. Saved cloud records can be deleted from History or by request.

For privacy questions or to request access, correction, or deletion of your account data, contact Shahnawaz at shahnawazify@gmail.com.