The verdict in three sentences
A custom ERP-CRM connector syncs customers, products and orders via API and webhooks, and costs 15,000 to 60,000 EUR in 2026 depending on the number of objects and rule complexity. It ships in 6 to 12 weeks and removes double entry, cutting errors by 70 %. Against an iPaaS at 500 - 3,000 EUR/month, custom wins when mappings are specific or volumes make the subscription pricier than the build.
iPaaS or custom connector?
Two paths exist to link ERP and CRM: an iPaaS (subscription integration platform) or a custom-built connector. Here is the 2026 comparison.
| Criterion | iPaaS (subscription) | Custom connector |
|---|---|---|
| Upfront cost | 2,000 - 8,000 EUR (setup) | 15,000 - 60,000 EUR |
| Recurring cost | 500 - 3,000 EUR/month | maintenance 2,500-9,000 EUR/yr |
| Specific mappings | limited to available connectors | fully free |
| Complex business rules | difficult | native |
| Error handling / replay | standard | custom and traced |
| 3-year cost (medium volume) | ~20,000-115,000 EUR | ~22,000-85,000 EUR |
| Vendor lock-in | high | low (code delivered) |
At modest volumes with available standard connectors, iPaaS is faster. As soon as mapping rules are specific or the monthly subscription balloons with volume, the custom connector becomes cheaper over 3 years and removes lock-in.
Integration checklist: what drives the price
Budget depends mainly on four factors. Neglecting them underestimates the project by 30 to 50 %.
| Checklist item | Budget impact | To verify |
|---|---|---|
| Number of synced objects | +2,000 to 6,000 EUR/object | Customers, products, orders, invoices |
| Sync direction | two-way = +40 % | One-way or two-way |
| Volume and frequency | real time = +30 % | Nightly batch vs real-time webhooks |
| Error handling and replay | +3,000 to 8,000 EUR | Replay queue, alerts, logs |
| Source API quality | -/+ per documentation | Clean REST API vs CSV export |
Error handling and replay is the most often forgotten item: yet it is what guarantees no order gets lost between the two systems.
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Mini case study
Karim, IT director of a 120-person trading SME in Marseille, suffers ERP/CRM double entry: every order is re-keyed manually, with 5 to 7 % errors and customer disputes. An iPaaS quote comes to 2,200 EUR/month (26,400 EUR/year) excluding specific rules. He chooses a custom connector at 34,000 EUR plus 5,000 EUR/year maintenance. Result: data-entry errors cut by 72 %, 2 man-days a month saved, and an annual bill more than halved from year 2 versus the iPaaS. ROI reached in ~16 months.
FAQ
How long to deliver the connector? From 6 to 12 weeks: 6-8 weeks for a one-way sync of 2-3 objects, up to 12 for two-way real time with advanced error handling.
What happens if an API goes down? The connector includes a replay queue and alerts: failed messages are kept and replayed automatically once the service returns, with no data loss.
Are we locked into the vendor? No: the connector code is delivered and documented to you. That's a major advantage over iPaaS, where you depend on the subscription and the vendor's catalogue.
Can we connect more than two tools? Yes: ERP, CRM, invoicing, e-commerce, warehouse. Each extra system is added under the same object-and-mapping logic (2,000 to 6,000 EUR/object).
What maintenance budget? Generally 2,500 to 9,000 EUR/year to track API changes, add fields and supervise replays.
Let's scope your project. Specify your two systems (ERP, CRM), the objects to sync and the desired direction; we'll price the connector and error handling. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
