The verdict in three sentences
A custom ERP-CRM connector synchronizes customers, quotes, orders and invoices both ways, removing double entry and its errors. The 2026 budget runs 10,000 to 35,000 EUR excl. VAT depending on the number of flows and rule complexity, delivered in 4 to 8 weeks. Typical gain: 6 hours/week saved and clearly higher data reliability.
Which flows to synchronize
Not everything should be synced: prioritize high-volume, error-prone flows. Most-requested 2026 flows:
| Flow | Direction | Frequency | Main benefit |
|---|---|---|---|
| Customer/account records | Two-way | Real time | One single customer truth |
| Quote -> order | CRM to ERP | Real time | Zero sales re-entry |
| Stock and availability | ERP to CRM | Every 15 min | Reliable quotes |
| Invoices and payments | ERP to CRM | Daily | Cash-in visibility |
| Product catalog/prices | ERP to CRM | Daily | Up-to-date pricing everywhere |
Two-way sync requires clear conflict-resolution rules (which side wins?), defined in a scoping workshop.
Connector price by complexity
| Tier | Cost (EUR excl. VAT) | Timeline | Flows | Features |
|---|---|---|---|---|
| Simple | 10,000 - 15,000 | 4 weeks | 1-2 flows | One-way, standard mapping |
| Standard | 15,000 - 25,000 | 6 weeks | 3-4 flows | Two-way, error handling |
| Advanced | 25,000 - 35,000 | 8 weeks | 5+ flows | Real time, monitoring, auto-recovery |
Maintenance and supervision: 150 to 600 EUR/month (queue monitoring, alerts, API changes).
Mini case study
Karine, CIO of a mid-size industrial company in Nantes (45 staff), runs an ERP for production and a CRM for sales. Six sales reps re-enter each approved quote into the ERP, i.e. about 1 hour/day/person lost and a 4% error rate.
She orders a Standard two-way connector (accounts + quote/order + stock): 22,000 EUR excl. VAT + 300 EUR/month. It removes re-entry: each rep gets back ~5 h/week, i.e. 30 h/week for the team. At 40 EUR/loaded hour, that is 1,200 EUR/week, or over 55,000 EUR/year. The investment pays back in about 5 months, with order errors sharply down.
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FAQ
Why custom rather than an off-the-shelf connector?
Standard connectors cover generic cases but stumble on your business rules (discounts, units, multi-company). Custom fits your exact processes and evolves with them.
What happens if an API goes down or returns an error?
The connector includes queues, automatic retries and alerts. No data is lost: failed operations replay once the system recovers.
Do we have to change our ERP or CRM?
No. The connector uses the existing APIs of both systems. No replacement needed.
How long until it is operational?
Between 4 and 8 weeks. Scoping flows and conflict rules is about a third of the timeline.
Does the connector handle large volumes?
Yes, via batch processing and incremental sync. We size it to your order and record volume.
Let's scope your project. List your priority flows (customers, quotes, stock, invoices) and both systems (ERP, CRM), and we price the right connector. 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.
