Is a CRM part of an ERP?

Some ERPs include a CRM module and some CRMs add operations features. The line has blurred, which is why all-in-one systems that cover both are common for small businesses.

Do I need an ERP for a small shop?

You need ERP-style features, products, stock, orders and invoicing, but rarely a full ERP. A system with a CRM, invoicing and stock per branch covers most shops.

Does DukeOS include accounting?

DukeOS includes invoicing with GST, payments tracking and stock, but not a general ledger, payroll or manufacturing. Most small businesses keep their books in their accountant's software.

What does DukeOS cost?

DukeOS is priced per business: $49, $99 or $199 a month (plus GST in India), with every app included.

How do I choose between them?

List the three jobs that take most of your week. If they are about customers, start with a CRM; if they are about products, you need stock and orders too. A system that covers both avoids choosing.

GuidesGuide

By SmartDuke TechnologiesUpdated 23 October 2026

CRM vs ERP: which does a small business need?

The short answer

A CRM manages customers and sales; an ERP manages operations such as stock, purchasing and accounting. Most small service businesses need a CRM first, plus bookings and invoicing; shops and distributors also need stock. Rather than buying both, many now choose one AI operating system that covers customers and operations together.

What a CRM does

A CRM (customer relationship management) system holds everyone you sell to: contacts, companies, enquiries, deals and their stages, notes, calls and messages. It answers questions like "who should I follow up today?" and "how many leads did we convert this month?" Service businesses, gyms, clinics, salons, agencies and institutes, live in their CRM because their work is people and appointments.

What an ERP does

An ERP (enterprise resource planning) system runs operations: products and stock, purchasing, sales orders, invoicing, accounting and often manufacturing. It answers questions like "what do we have in stock?" and "what did we sell at what margin?" Traditional ERPs are powerful but often need a setup project and training. Read about a lighter approach in AI ERP for small business.

Which do you need first?

Start from where the work is. If your days are spent on enquiries, appointments, renewals and follow-ups, you need a CRM with bookings and invoicing. If they are spent on products, stock and orders, you need ERP features too. Very few small businesses need full manufacturing or a general ledger in the same system; an accountant's software usually handles the books.

Mostly customers and appointments: CRM, bookings, invoicing.
Customers and products: CRM, invoicing, stock and orders.
Manufacturing or full accounting: a full ERP, alongside your CRM.

Why one system is often better

Running a CRM and an ERP separately means two logins, duplicate customer records and copying data between them. One system with both sides shares a single customer, so a WhatsApp enquiry, a booking, an invoice and a stock sale all appear on the same timeline. Add an AI assistant that can see both, and it can do the joined-up work: noticing a regular customer stopped buying, or that a product will run out. That is the idea behind an AI operating system for business.