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feature spotlight

Digital khata — your paper book, but it never gets lost

ExtinctBook is a digital khata built for Indian shopkeepers. Same concept as your paper khata. Faster entries, automatic reminders, and balances that update themselves.

Everything your paper khata did — and more

Write customer name + amount
Type or search customer, add amount in 5 seconds
Manually add up balance
Balance shows instantly, updates with every entry
Remember to call for payment
One tap sends WhatsApp reminder with payment link
Count total outstanding at month end
Total outstanding visible on home screen, always
Lose the notebook = lose everything
Cloud backup, accessible from any phone
No history after payment
Full history: every entry, every payment, every date

Offline-first — works even without internet

Many shop areas in India have unreliable mobile data. ExtinctBook is built offline-first: every feature works without internet. Entries save locally and sync to the cloud the moment connectivity returns.

You never lose an entry because your SIM had no signal. The app behaves identically whether you are online or not.

Free digital khata — no catch

ExtinctBook's core digital khata is free: unlimited customers, unlimited entries, WhatsApp reminders, daily profit summary. No subscription. No limit increase fees.

Join waitlist →Download on Android

before you go

Frequently asked questions

What is a digital khata?

A digital khata is a mobile app that replaces the paper ledger (khata book) used by Indian shopkeepers. It records customer credit, tracks payments, sends reminders, and shows profit — all without paper.

Does digital khata work without internet?

Yes. ExtinctBook is offline-first. You can add entries, view balances, and use all features without internet. Data syncs automatically when connectivity returns.

How secure is digital khata compared to paper?

More secure. Paper can be lost, damaged, or read by anyone. ExtinctBook data is encrypted in transit and at rest, accessible only to you via your login.

Is digital khata free?

ExtinctBook's digital khata is free: unlimited customers, unlimited entries, WhatsApp reminders included. No credit card required.

Also see: WhatsApp Reminders · Daily Profit Tracking · What is Udhar Khata?