The verdict in three sentences
A one-way connector between your business app and an ERP/CRM costs 5,000 to 12,000 EUR in New York in 2026, a real-time two-way connector with field mapping 12,000 to 30,000 EUR. The timeline runs 3 to 7 weeks and maintenance 600 to 1,500 EUR/month. Against a market connector rented at 150 to 600 EUR/month, the custom build pays back in 24 months while removing 60 to 80 % of double data entry.
One-way or two-way: the real cost driver
Flow direction and real-time change the architecture radically. A nightly push is simple; a real-time two-way sync forces conflict resolution and fine-grained error handling.
| Connector type | Scope | 2026 price (EUR) | Timeline |
|---|---|---|---|
| One-way batch | Scheduled export (nightly) | 5,000 - 9,000 | 3 - 4 weeks |
| One-way real-time | Event-driven push | 8,000 - 12,000 | 4 - 5 weeks |
| Two-way batch | Scheduled cross-sync | 12,000 - 20,000 | 5 - 6 weeks |
| Two-way real-time | Mapping + conflicts + webhooks | 18,000 - 30,000 | 6 - 7 weeks |
| Multi-system (ERP + CRM) | Central sync hub | 25,000 - 45,000 | 8 - 12 weeks |
The target platforms affect price: Salesforce and HubSpot offer rich, documented APIs, while some legacy Sage ERP systems require intermediate connectors or file exports, which increases effort.
Custom vs market connector over 3 years
SaaS connectors exist (150 to 600 EUR/month) but impose their data model and bill by volume. Custom has a higher upfront cost but no cap.
| Item | Market connector | Custom connector |
|---|---|---|
| Setup | 1,000 - 4,000 EUR | 12,000 - 20,000 EUR |
| Monthly subscription/maintenance | 150 - 600 EUR | 600 - 1,500 EUR/month |
| 3-year cumulative | 6,400 - 25,600 EUR | 33,600 - 74,000 EUR |
| Custom mapping | Limited | Full |
| Objects/volumes | Capped | Unlimited |
| Reversibility (you own the code) | No | Yes |
Custom becomes rational as soon as there are many objects to sync, the business logic is specific, or you want to control the code rather than depend on a third-party vendor.
Mini case study
Peter, COO of an industrial mid-market firm in New York (140 staff), wants to sync his production management app with Salesforce (orders) and Sage (invoicing). Chosen quote: 22,000 EUR for a real-time two-way Salesforce connector and 9,000 EUR for the one-way Sage export, totalling 31,000 EUR, maintenance 1,200 EUR/month. Today three admin staff re-key orders 8 hrs/week each, i.e. 24 hrs at a loaded cost of 38 EUR/hr = 912 EUR/week, ~47,000 EUR/year. A 70 % cut in that double entry represents ~33,000 EUR/year saved: the connector pays for itself in about 14 months.
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FAQ
How much does connecting to Salesforce cost in 2026?
A simple one-way connector starts at 5,000-9,000 EUR; a real-time two-way with field mapping reaches 18,000-30,000 EUR. Since the Salesforce API is rich, cost comes mainly from sync logic, not access.
Do I have to rebuild the connector if I change ERP?
Partly: the orchestration layer is kept, only the adapter for the changed system is rebuilt, i.e. 30 to 50 % of the initial budget. That's a strong argument for a decoupled-connector architecture from the start.
Is real-time essential?
Not always. A nightly batch is enough for invoicing or reporting and costs 30 to 40 % less. Real-time is justified when an order must appear immediately across several systems.
What double-entry reduction can I expect?
Between 60 and 80 % depending on coverage. The gain is measured in saved admin hours and fewer re-keying errors, often the main source of accounting discrepancies.
What maintenance budget should I plan?
600 to 1,500 EUR/month. ERPs and CRMs publish API updates; without maintenance, a vendor-side change can break the sync without warning.
Let's scope your project. Specify your systems (ERP, CRM), the sync direction and the volumes: we'll price connector + maintenance, a 2026 order of magnitude of 5,000 to 45,000 EUR. 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.
