The short answer
A CRM (customer relationship management) system is about people and pipeline: contacts, conversations, deals and next steps. An ERP (enterprise resource planning) system is about operations and money: what you buy, stock, make, sell, invoice and collect, and how it reaches your accounts.
Losing track of prospects and follow-ups? A CRM. Orders, stock, purchasing and accounting out of line? An ERP. Many growing organisations eventually need both, connected.
What each system organises
| CRM | ERP | |
|---|---|---|
| Main users | Sales, marketing, account managers, service | Operations, finance, purchasing, inventory, production |
| Core records | Contacts, companies, leads, deals, activities, tickets | Items, stock, suppliers, orders, invoices, payments, general ledger |
| Questions answered | Who should we call? What stage is this deal? Which campaign brought this lead? | What is in stock? What did this order cost? Who owes us? |
| "Done" means | A deal is won or lost | An order is delivered, invoiced, paid and posted |
| Fixes | Forgotten follow-ups, pipeline guesswork, contact spreadsheets | Stock errors, invoicing delays, painful month-end, disconnected purchasing |
Where they overlap
The boundary is not neat. Many ERPs include basic CRM: ERPNext has leads and opportunities alongside accounting, buying, selling and stock (ERPNext documentation). Many CRMs offer quoting, products and simple invoicing, often as paid add-ons. So more than features, ask which system is correct when both hold customers and quotes.
Three common situations
Service firm, sales problem
Lost proposals; accounting works. A CRM, perhaps creating customers in accounting from won deals; an ERP adds complexity.
Distributor, operations problem
Orders in email and WhatsApp, stock counts wrong: a purchase-to-invoice chain problem. An ERP; its CRM features may suffice.
Growing manufacturer, both
Complex pipelines and campaigns, plus production and inventory. Both, with ownership rules and an integration.
Hypothetical, simplified scenarios.
Choosing a source of truth
With both systems, decide ownership field by field:
CRM owns
Contacts, relationship history, lead source, pipeline stage.
ERP owns
Billing details, tax settings (VAT, withholding tax), credit terms, items, prices, orders, invoices, payments.
One-way copies
Won deals go to the ERP; invoice and payment status return read-only for sales.
Give each customer a shared identifier in both systems, or records will duplicate over time. See system integration.
When a smaller change is enough
Check simpler fixes first: your accounting software may already do quotes, inventory or recurring invoices; a structured pipeline in a tool you pay for may suit a two-person sales team; a clear process (who enters what, when, where) often removes more errors than new software. New systems bring licences, implementation, migration, training and administration: worth it for costly, recurring problems, not when a checklist would do.
Total cost of ownership
Compare over several years, not the first-year price: licences or hosting, implementation, training, administration, customisation, integration and exit. Licences priced in US dollars? Ask what a weaker naira does to the bill.
Questions to ask on each cost
| Cost | Questions to ask |
|---|---|
| Licences or hosting | Per user or per module? Price as you grow? For open-source systems such as ERPNext, who hosts it and at what cost? |
| Implementation | Configuration, data migration, integrations, testing |
| Training | Initial, plus new staff |
| Administration | Who manages users, permissions, updates and backups? |
| Customisation | Every change must be maintained through upgrades |
| Integration | API access may need a higher plan; each connection needs monitoring |
| Exit | Can you export all your data in a usable format? |
Requirements checklist
Use it before looking at any vendor, to keep the evaluation on your problem rather than feature lists.
The problem
- What goes wrong today, in a sentence or two, and for whom?
- What does it cost (time, errors, delays, lost sales), roughly?
Processes (for example lead to deal, quote to order, purchase to stock, order to invoice to payment)
- Which processes must the system support?
- Which of your steps are unusual, and which are standard?
Data
- Which records move in, and where do they live now?
- Source of truth for customers, products, prices and invoices?
- How clean is existing data, and who will clean it?
People and access
- How many users, in which roles?
- Who must, and must not, see financial information?
- Who administers the system after go-live?
Connections
- Which systems must it connect to (website, accounting, e-commerce, email marketing)?
- Must connections be immediate, or is daily enough?
Constraints
- Budget for year one and each year after, incl. dollar-priced licences.
- Deadlines that are genuinely fixed.
- Hosting, data location (NDPA transfers outside Nigeria) or industry requirements.
- Connectivity and power resilience to plan for.
Next step
Evaluating ERPNext? See ERPNext implementation and training. Already have both systems and they disagree? Start with the integration readiness checklist.
Sources and further reading
Product capabilities and guidance change. These are the primary sources this article relies on, checked on the review date above.
- What is ERPNext?, ERPNext documentation (Frappe)
- Role Based Permissions, ERPNext documentation (Frappe)
- HubSpot Developer Documentation, HubSpot
- Overview of SuiteTalk REST Web Services, Oracle NetSuite Help Center
This article is general information, not legal, accounting or security advice for your specific situation. Examples are hypothetical unless stated otherwise.