Every tenant, every rupee, every receipt — on your phone, with no account and no subscription.

RentBook is for landlords with a few units: a flat or two, a PG, a couple of shops. It keeps track of who owes what, records every payment, and sends a proper PDF receipt to the tenant on WhatsApp in one tap.

Dues that make themselves Add a tenant with a rent and a due day. RentBook creates each month's due automatically, prorates partial first and last months, and knows the Indian norm: rent for August is due in September, not in advance.

Receipts tenants trust A5 PDF receipts with a sequential receipt number, amount in words (one lakh twelve thousand…), what the payment was towards, and the balance after it. Shared straight to the tenant's WhatsApp.

See who owes at a glance The home screen shows this month's billed, collected, pending and overdue totals, and a list of tenants who owe, overdue first.

Handles real life

Partial payments carry forward and are cleared oldest-first
Extra charges: electricity, maintenance, repairs, late fees
Move-out settlement: prorated last month, deposit adjustment, notice-period shortfall
Change rent, due day or deposit mid-tenancy
One-tap call or WhatsApp reminder with the balance and next due date
Built for PGs too

Group beds under rooms ("Room 101" → Bed 1–4) and add a whole room's beds in one step
Short-stay guests: bill by the night instead of the month — one running bill that updates as they extend, finalized automatically at checkout. Handles a single night's stay just as easily as a month.
Yours, and only yours

Works fully offline — no server, no login, no ads
App lock with fingerprint, face or phone PIN
Backup to a file you control; restore on a new phone in seconds
Export all payments to CSV for your accountant
Free forever for one property: 3 units for a flat/house, or 5 rooms (up to 20 beds) for a PG.