The verdict in three sentences
A custom ERP-CRM connector costs 14,000-50,000 EUR in 2026 depending on the number of flows, the sync mode and conflict handling. The real cost is in bidirectional mapping and real-time reliability, not the mere technical connection. A good connector kills double entry and makes customer data trustworthy across the whole stack.
Price by connector scope
Cost depends on the number of synced objects, direction (one-way or bidirectional) and frequency. 2026 order of magnitude for an integration between a market ERP and CRM.
| Scope | Price (EUR) | Sync | Objects covered |
|---|---|---|---|
| Basic (one-way) | 14,000 - 20,000 | Hourly batch | Accounts, contacts |
| Standard (bidirectional) | 20,000 - 32,000 | Near real-time | Accounts, quotes, orders |
| Advanced (real-time + conflicts) | 32,000 - 50,000 | Real-time | + Invoices, stock, products |
| Hosting / middleware | 80 - 400 EUR / month | — | Queues, logs, monitoring |
| Annual maintenance | 15 - 20 % / yr | — | API changes, fixes |
Synced flows and cost per connector
Each flow adds mapping, conflict rules and tests. 2026 estimate per integrated flow.
| Synced flow | Direction | Complexity | Indicative cost |
|---|---|---|---|
| Accounts & contacts | Bidirectional | Low | 3,000 - 5,000 EUR |
| Quotes & opportunities | ERP → CRM | Medium | 4,000 - 7,000 EUR |
| Orders | Bidirectional | Medium | 5,000 - 8,000 EUR |
| Invoices & payments | ERP → CRM | High | 6,000 - 10,000 EUR |
| Stock & product catalog | ERP → CRM | High | 5,000 - 9,000 EUR |
Mini case study
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Sophie, IT director of a distribution mid-cap in Rennes, has sales reps re-keying every order from the ERP into the CRM. A Standard bidirectional connector at 24,000 EUR and 200 EUR/month middleware kills 2,500 re-entries/month at 2 minutes each — 83 h/month valued at 45 EUR, or 3,700 EUR/month. It pays back in about 7 months, not counting fewer billing errors.
FAQ
Why not use an off-the-shelf connector? Generic connectors cover 60-70 % of cases but fail on your specific business rules and custom fields. Custom guarantees exact mapping and conflict handling.
How do you handle data conflicts? We define a source of truth per field and priority rules, with logging. Ambiguous cases are queued for human review rather than silently overwritten.
Real-time or batch? Hourly batch is often enough and cheaper. Real-time is justified for stock, order statuses or live sales experience.
What if an API changes? The connector is versioned and monitored; alerts catch breakages. Annual maintenance covers adapting to API changes.
How long to build? Plan 4 to 10 weeks depending on the number of flows and API access availability on both sides.
Let's scope your project. List your ERP, your CRM and the flows to sync (direction and frequency): we price the connector and the productivity gain. 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.
