The verdict in three sentences
A custom connector between ERP, CRM and accounting costs between 10,000 and 40,000 EUR in 2026 depending on the number of flows and the complexity of the mappings. Expect a 6 to 12 week project, an orchestration middleware and annual supervision from 3,600 EUR. The return on investment comes from removing double entry and a sharp drop in reconciliation errors.
What each integration flow costs
A connector's price mainly depends on the number of flows (ERP to CRM, CRM to accounting, etc.) and the volume of fields to map. Here is a 2026 order of magnitude for the Berlin market.
| Integration flow | Complexity | 2026 price (EUR) | Timeline |
|---|---|---|---|
| ERP customers to CRM | Simple | 3,500 - 6,000 | 1-2 wk |
| CRM quotes/orders to ERP | Medium | 6,000 - 10,000 | 2-3 wk |
| ERP invoices to accounting | Medium | 5,000 - 9,000 | 2-3 wk |
| Payments accounting to ERP | High | 7,000 - 12,000 | 3-4 wk |
| Product catalog two-way | High | 8,000 - 14,000 | 3-4 wk |
| Middleware + supervision | Core | 4,000 - 8,000 | 2 wk |
A typical three-flow project lands around 18,000 to 28,000 EUR.
Savings on entry and errors
Double entry is expensive in both time and reliability. The table below quantifies the before/after impact for a company processing about 900 invoices a month.
| Indicator | Before connector | After connector |
|---|---|---|
| Monthly entry time | 60 h | 8 h |
| Entry error rate | 4.5% | 0.6% |
| Reconciliation gaps/month | 22 | 3 |
| Accounting close time | 9 days | 4 days |
| Annual supervision cost | - | 3,600 - 7,200 EUR |
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Mini case study
Claire is CFO of a 140-employee industrial company in Berlin. Her teams manually re-enter invoices from the ERP into accounting: about 60 hours per month at 35 EUR fully loaded, i.e. 2,100 EUR/month. She invests 24,000 EUR in a three-flow connector plus 4,800 EUR/year of supervision. After go-live, entry time drops to 8 hours (280 EUR/month). Monthly savings reach 1,820 EUR, i.e. 21,840 EUR/year. The connector pays for itself in about 15 months including supervision, then generates over 17,000 EUR of net savings per year.
FAQ
Do you always need middleware? For only two systems, a point-to-point connector is sometimes enough. From three systems, an orchestration middleware (4,000 to 8,000 EUR) secures replays and supervision and avoids an API spaghetti.
How much is annual maintenance? Budget 3,600 to 7,200 EUR/year in 2026 for supervision, alerts and adapting to API updates. Plan it from the start; it is not optional.
Can you connect an old proprietary ERP? Yes, through its exports/API or an intermediate database. An ERP without a modern API adds 20 to 40% to the budget because you often go through files or a dedicated extraction layer.
How long before production? Between 6 and 12 weeks depending on the number of flows, including testing and phased rollout. We usually start with the most profitable flow (invoices) to secure a quick win.
How is data security ensured? Encrypted flows, logging, role-based access and EU hosting. Supervision logs trace every synced record and let you replay a failed flow.
Let's scope your project. Tell us your systems (ERP, CRM, accounting software), the number of flows to secure and your monthly invoice volume: we will frame the scope and indicative budget. 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.
