The short answer
- A CRM (customer relationship management) system is about people and pipeline: who your contacts are, what you have discussed, which deals are in progress, and what happens next.
- An ERP (enterprise resource planning) system is about operations and money: what you buy, stock, make, sell, invoice and get paid, and how that shows up in your accounts.
If your main problem is losing track of prospects and follow-ups, you are probably looking for a CRM. If your problem is that orders, stock, purchasing and accounting do not line up, you are probably looking for an ERP. Many growing organizations eventually need both, connected.
What each system organizes
| Question | CRM | ERP |
|---|---|---|
| Main users | Sales, marketing, account managers, service teams | Operations, finance, purchasing, inventory, production |
| Core records | Contacts, companies, leads, deals, activities, tickets | Items, stock, suppliers, purchase and sales orders, invoices, payments, general ledger |
| Typical questions answered | Who should we call? What stage is this deal at? Which campaign brought this lead? | What do we have in stock? What did this order cost us? Who owes us money? |
| What "done" means | A deal is won or lost | An order is delivered, invoiced, paid and posted to the accounts |
| Common problems it fixes | Forgotten follow-ups, pipeline guesswork, contact lists in spreadsheets | Stock errors, invoicing delays, month-end reconciliation pain, disconnected purchasing |
Where they overlap
The boundary is not neat. Many ERPs include basic CRM features, such as leads, opportunities and customer records. ERPNext, for example, includes CRM features such as leads and opportunities alongside its accounting, buying, selling and stock modules (ERPNext documentation). Many CRMs offer quoting, products and even simple invoicing, often through paid add-ons.
Overlap raises a practical question: if both systems can hold customers and quotes, which one is correct? Answering that is more important than picking features.
Three common situations
1. A service business with a sales problem. A consultancy loses track of proposals and follow-ups. It invoices through a simple accounting package that works fine. Likely answer: a CRM, possibly connected to the accounting package so that won deals create a customer record. An ERP would add complexity without solving the real problem.
2. A distributor with an operations problem. A wholesale business has orders in email, stock in a spreadsheet and invoices in accounting software, and the stock count is regularly wrong. Likely answer: an ERP, because the problem is the chain from purchase to stock to sale to invoice. Its built-in CRM features may be enough for a small sales team.
3. A growing company with both. A manufacturer has a busy sales team with complex pipelines and marketing campaigns, and also needs production planning and inventory control. Likely answer: both, with a clear rule about which system owns which information and an integration between them. See system integration.
These scenarios are hypothetical and simplified.
Choosing a source of truth
When both systems exist, decide ownership field by field. A common split:
- CRM owns: contacts, relationship history, lead source, pipeline stage.
- ERP owns: customer billing details, tax settings, credit terms, items and prices, orders, invoices and payments.
- Copied one way only: won deals flow from CRM to ERP; invoice and payment status flow back to the CRM as read-only information for the sales team.
Each customer should carry a shared identifier in both systems. Without it, records will duplicate over time.
When a smaller change is enough
Before buying either system, check whether the problem can be solved more simply:
- Your accounting software may already do more than you use, such as quotes, inventory or recurring invoices.
- A shared, well-structured pipeline in a tool you already pay for may be enough for a two-person sales team.
- A clear process (who enters what, when, and where) often removes more errors than new software does.
New systems bring licences, implementation, data migration, training and ongoing administration. They are worth it when the problem is costly and recurring, not when a checklist would do.
Total cost of ownership
Compare options over several years, not just the first-year price:
| Cost | Questions to ask |
|---|---|
| Licences or hosting | Per user? Per module? What happens to price as you grow? For open-source systems such as ERPNext, who hosts it and what does that cost? |
| Implementation | Configuration, data migration, integrations, testing |
| Training | Initial training, plus training for new staff |
| Administration | Who manages users, permissions, updates and backups? |
| Customization | Every custom change must be maintained through upgrades |
| Integration | API access may require a higher plan; each connection needs monitoring |
| Exit | Can you export all your data in a usable format if you leave? |
Requirements checklist
Use this before you look at any vendor. It keeps the evaluation focused on your problem rather than on feature lists.
The problem
- In one or two sentences, what goes wrong today, and who is affected?
- What does that cost (time, errors, delays, lost sales), even roughly?
Processes
- Which processes must the system support? (for example: lead to deal, quote to order, purchase to stock, order to invoice to payment)
- Which steps are unusual in your organization, and which are standard?
Data
- Which records will live in the new system, and where do they live now?
- Which system will be the source of truth for customers, products, prices and invoices?
- How clean is the existing data? Who will clean it?
People and access
- How many users, in which roles? Who needs to see financial information and who must not?
- Who will administer the system after it goes live?
Connections
- Which other systems must it connect to (website, accounting, e-commerce, email marketing)?
- Do those connections need to happen immediately, or is daily enough?
Constraints
- Budget for the first year and for each year after.
- Deadlines that are genuinely fixed.
- Hosting, data location or industry requirements that must be met.
Next step
If you are evaluating ERPNext specifically, see ERPNext implementation and training. If you 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.