Custom ERP and CRM Integration
We connect your ERP with your CRM, email and invoicing through custom APIs. Data flows between systems on its own and your team stops retyping it by hand.
ASD Solutions is a custom software development company based in Madrid that integrates the ERP you already have, whether Sage, Holded, Odoo, A3 or SAP Business One, for SMEs across Spain. A typical integration costs between €1,500 and €4,000 and takes 3 to 6 weeks. With several systems or data migration, from €5,000. Fixed price agreed before we start, excluding VAT.
from €300 for a one-off fix and from €1,500 for a project.
Prices exclude VAT.
ERP and CRM Integration Services
Three ways to connect your systems without changing tools
ERP Integration with CRM and Invoicing
We build custom APIs that sync customers, orders and invoices between your ERP, your CRM and your invoicing system. Every piece of data is entered once and shows up wherever it needs to, with a full trace of who changed what and when.
- Two-way sync of customers, orders and invoices
- REST or GraphQL APIs built on top of your current ERP
- Connections with Sage, Holded, Odoo, A3 and SAP Business One
- Change log and traceability for every record
Email Integration with ERP and CRM
Orders arriving by email create records in the ERP automatically, with nobody copying them by hand. Every conversation is linked to the customer's record, so anyone on the team sees the full history without digging through inboxes.
- Email orders that create records automatically
- Conversations linked to each customer's record
- Connectors for Microsoft 365 (Graph API) and Gmail API
- Webhooks to process email in real time
Legacy Integration Modernization
We rescue integrations that break every week: unsupported connectors, CSV exports someone runs by hand every Friday, and macros only understood by the person who is no longer around. We replace them with stable, monitored and documented connections.
- Replacement of broken or unsupported connectors
- No more manual CSV exports
- Migration of fragile macros and scripts to stable APIs
- Clear documentation of every piece for your team
Why integrate your systems with ASD Solutions?
Fewer admin hours, reliable data and a budget that does not move
No more manual data entry
Teams that copy orders and invoices between systems lose 5 to 10 hours a week. Integration gives that time back to work that matters and removes the errors of typing the same thing twice.
Consistent data across systems
The same customer, the same order and the same invoice in every tool. No more finding out at month end that the CRM says one thing and the ERP another.
No need to change your ERP
We integrate the ERP you already have, whether it is Sage, Holded, Odoo, A3 or SAP Business One. No forced migrations and no retraining the whole team on a new tool.
Fixed price before we start
After the diagnosis you get a fixed quote with scope and deadlines. If the project gets harder on our side, the price does not change.
Does your business need to scale but current tools limit you?
We develop software that grows with you. Don't fit into a model. Build your own.
Let's talk about your projectWho builds it
Our own senior team based in Spain. We never outsource: the same team that quotes your project builds it.
Meet the teamConnect your ERP or build a custom one
Integration is the cheapest option when your current ERP covers the essentials but does not talk to the rest of your systems. If the real problem is that the ERP no longer fits how your company works, the alternative is a custom module or a custom ERP. In how much a custom ERP costs in 2026 we explain the price ranges and when it is not worth it.
Part of our custom software development . Other services:
Related guide: how to integrate ERP, CRM and email with custom APIs
Frequently asked questions
How much does an ERP and CRM integration cost?
An email integration with an ERP or CRM usually costs between €1,500 and €4,000, depending on the systems involved and the business logic. Larger projects, with several systems or data migration, start at €5,000. You get a fixed quote before we start, with no extra hours or surprises.
How long does a typical integration take?
Between 3 and 6 weeks in most cases. An email-to-CRM integration can be running in 3 weeks; a project connecting ERP, CRM and invoicing gets closer to 6. The diagnosis gives you a concrete timeline for your case.
What if my ERP has no API?
It is more common than it sounds and it has a solution. We work with vendor connectors, direct database access, scheduled exports or intermediate files. Almost every ERP common in SMEs has some integration path; the diagnosis tells you which one applies to yours and what its limits are.
Do I have to change my ERP?
No. We integrate the ERP you already use and your team already knows. Replacing an ERP costs tens of thousands of euros and months of adaptation; connecting it properly to the rest of your systems solves most problems for a fraction of that.
How do we start?
With a €190 audit. Within 72 hours you get a diagnosis covering the systems involved, the recommended integration path and a fixed quote. If you go ahead with the project, the €190 is deducted from the total.
What about errors and duplicate data?
Every integration includes data validation, deduplication rules and an error log. If an order arrives malformed it does not get lost or duplicated: it goes into a review queue and the system notifies the right person. After go-live we monitor the integration to catch failures before they affect the business.
Ready to scale your business with technology that really works?
Your company deserves software that adapts to you, not the other way around. We build your solution together.
Let's talk about your project