The verdict in three sentences
A custom ERP/CRM connector costs 8,000 to 30,000 EUR in 2026 depending on the number of synced objects and rule complexity. An iPaaS (subscription + setup) starts faster but costs more per year as volumes grow. The real challenge is not the connection but error handling, deduplication and replays.
Custom vs iPaaS: the pricing
The choice depends on the number of flows, volumes and your need for control. iPaaS excels at standard connections; custom wins on business logic and cost at scale.
| Approach | Upfront cost | Annual cost | High volumes | Timeline |
|---|---|---|---|---|
| Standard iPaaS (1-2 flows) | 3,000 - 8,000 EUR | 3,000 - 12,000 EUR | Rising cost | 2 - 4 wks |
| iPaaS + custom rules | 8,000 - 15,000 EUR | 6,000 - 20,000 EUR | Rising cost | 3 - 5 wks |
| Custom connector | 8,000 - 18,000 EUR | 1,500 - 4,000 EUR | Flat cost | 3 - 6 wks |
| Full custom middleware | 18,000 - 30,000 EUR | 3,000 - 6,000 EUR | Flat cost | 5 - 8 wks |
What makes it reliable (and priced)
A naive sync breaks on the first edge case. The items below separate a good connector from a fragile script.
| Function | Why it is critical | Price impact |
|---|---|---|
| Two-way sync | Avoid double entry | +20-30 % |
| Deduplication | Prevent duplicate customers | +10-15 % |
| Queue + replays | No message lost | +15-20 % |
| Field mapping | Align data models | Included |
| Monitoring + alerts | Detect failures fast | +10 % |
| Audit log | Traceability | +5-10 % |
Mini case study
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Wei, COO of a 60-person B2B services SME in Singapore, had an unlinked ERP and CRM: every order was keyed twice, with 2.5 h/day of re-entry and invoicing discrepancies. A custom connector at 16,000 EUR (about 23,000 SGD) syncs customers, orders and invoices both ways. Gain: 2 h/day and -95 % discrepancies, for ROI reached in 7 months.
FAQ
iPaaS or custom? iPaaS suits 1-2 standard flows and a fast start. Beyond high volumes or strong business rules, custom costs less per year.
Is two-way sync essential? Often yes: without it, one of the two apps stays manually updated. It is 20 to 30 % of cost but removes double entry.
What happens if a sync fails? A queue with automatic replays and alerts ensures no message is lost. That is what separates a pro connector from a script.
How long to set up? 3 to 8 weeks depending on the number of objects and the complexity of mapping and dedup rules.
What maintenance budget? Budget 1,500 to 6,000 EUR/year to absorb ERP/CRM API changes and monitoring.
Let's scope your project. Share your ERP, CRM, the objects to sync and volumes: we will price custom vs iPaaS. 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.
