15.06.2026
19.05.2026
The Best E-Procurement Platforms for German SMEs in 2026
Author
Andy Freund Senior Growth Manager
Comparison: simple system, Onventis, Mercateo, Meplato
Anyone looking for the right e-procurement solution in the German SME sector is quickly faced with the same question: Which platform really suits the size of our company, our suppliers and our processes? This comparison will help you to make an informed decision - based on specific criteria that really count for SMEs.
Why the e-procurement comparison looks different for SMEs
Large corporations have their own IT departments, long-term SAP contracts and dedicated purchasing managers. SMEs work differently: decisions have to be made quickly, the implementation must not paralyse ongoing operations, and the software must be able to be connected to existing ERP systems - not the other way around.
This is precisely why it is worthwhile to measure the leading platforms not in the abstract, but specifically against the needs of SMEs in Germany.
The four platforms at a glance
simple system
simple system specializes in indirect purchasing with a strong SAP focus and a plug & play approach. The platform scores with the fastest implementation on the market - go-live in 1-2 weeks - and a B2C-like user interface that does not require lengthy training. As the only provider in the comparison, simple system completely fulfils all evaluation criteria.
Strengths for SMEs:
- Fastest implementation in comparison: Go-live in 1-2 weeks
- Lowest IT effort, supplier-neutral
- Very high supplier freedom - access without registration
- Strongest OCI/SAP integration in a market comparison
- Integrated rules and role control
- B2C-like user interface
Overall score: 94/100
Suitable for: Companies that want to digitise indirect requirements quickly, easily, neutrally and cost-effectively.
Unite (Mercateo/Unite Group)
Mercateo (now Unite) is one of the largest B2B trading and network models in Europe - marketplace and e-procurement combined. The 1-vendor model is a real advantage for companies that want to bundle many suppliers under one invoice. Compared to simple system, however, longer rollout times and less deep ERP integration are significant.
Strengths for SMEs:
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Large European supplier network
- 1-vendor model possible
- Stable, proven processes
Restrictions:
- Rollout duration 4-12 weeks
- Less focus on deep ERP integration
Overall score: 79/100
Suitable for: Companies that are heavily network-driven in their purchasing or need to manage many suppliers.
Onventis
Onventis is the functional winner in the P2P sector - no other provider offers broader coverage of tenders, supplier management and workflows. However, the price is high: implementation takes 3-4 months and requires considerable IT effort. For companies that only want to digitise indirect purchasing, Onventis is often oversized.
Strengths for SMEs:
- Largest range of functions of all platforms compared
- Strong workflows and approval processes
- Good supplier management
- Cloud-based with GDPR-compliant data storage in Germany
Limitations:
- Implementation time 3-4 months
- High complexity - often oversized for purely indirect purchasing
Overall score: 70/100
Suitable for: Companies looking for a fully-fledged procurement system including tenders and supplier management - not just indirect purchasing.
Meplato
Meplato is a strong specialist in catalogue and product data - ideal for companies where product data quality is paramount. Meplato is less suitable as a comprehensive platform solution for operational indirect purchasing.
Strengths for SMEs:
- Very good product data and catalogue maintenance
- Many suppliers are accessible without registration
Limitations:
- No complete P2P process
- Low role control
- Implementation 6-12 weeks
Overall score: 55/100
Suitable for: Companies with a focus on catalogue quality and structured product data.
The comparison at a glance
| Criterion | simple system | Unite | Onventis | Meplato |
|---|---|---|---|---|
| Focus on | Indirect purchasing / C-parts | B2B marketplace + e-procurement | P2P & strategic purchasing | Catalogue / product data |
| ERP integration | ✓ ✓✓ Strong | ✓✓✓ Existing | ✓✓✓ Available | ✓ Limited |
| Supplier network | ✓ ✓✓ Large & curated | ✓ ✓✓ Large | ✓✓ Medium | ✓✓ ✓ Large |
| Duration until go-live | 1-2 weeks | 2-4 weeks | 3-4 months | 6-12 weeks |
| User friendliness | ✓ ✓✓ B2C-like | ✓ Medium | ✓ Medium | ✓ Medium |
| Compliance workflows | ✓✓ Strong | ✓✓✓ Medium | ✓✓ ✓ Strong | ✓ Limited |
| 1 creditor model | ✗ | ✓ | ✗ | ✓ ✓ |
| DSGVO / Germany | ✓ | ✓ | ✓ | ✓ |
| Total score | 94 / 100 | 79 / 100 | 70 / 100 | 55 / 100 |
Which platform suits your company?
The choice of the right e-procurement platform ultimately depends on three key questions:
- How quickly does the solution need to be up and running? If you can't cope with a months-long implementation process, simple system has the clear advantage: go-live in 1-2 weeks, no major IT effort, ready for immediate use. Onventis takes 3-4 months on average.
- Is it about indirect purchasing or complete P2P? If you only want to digitise C-parts and indirect requirements, you don't need a complete P2P system like Onventis - that would be overengineering. simple system is built for exactly that.
- How important is ERP integration? simple system offers the strongest OCI/SAP integration in comparison - crucial for SMEs that already work with SAP, Microsoft Dynamics or similar systems.
Conclusion
For German SMEs that want to digitise indirect purchasing quickly, easily and with full ERP integration, simple system 2026 is the test winner - with an overall score of 94/100 and as the only provider to meet all the criteria in the decision matrix. The combination of 1-2 weeks of go-live, maximum user-friendliness and the strongest SAP integration makes the platform the first choice for SMEs.
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A B2B marketplace like Unite/Mercateo enables digital purchasing from a broad product range — similar to an online shop for businesses. An e-procurement platform like simple system or Onventis goes further: it controls the entire ordering process including approval workflows, budget control, ERP integration and supplier management. For SMEs looking to reduce maverick buying and control spending, a complete e-procurement solution is the better choice.
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For mid-sized companies in Germany, a platform that meets three criteria is recommended: seamless ERP integration (e.g. SAP or Microsoft Dynamics), a broad supplier network with pre-negotiated catalogs, and GDPR-compliant data storage in Germany. simple system meets all three requirements and is specifically designed for indirect purchasing from approximately 100 employees upward.
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Costs vary depending on the platform, company size and scope of functions. Marketplace-based solutions like Unite/Mercateo are often transaction-based and usable without a base fee. Full e-procurement platforms like simple system or Onventis typically work with license models based on order volume or number of users. For a reliable cost estimate, a direct conversation with the provider is recommended.
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This depends heavily on the chosen platform and existing IT infrastructure. simple system enables go-live in 1–2 weeks — the fastest value in the market comparison. Unite requires 2–4 weeks, Meplato 6–12 weeks, Onventis an average of 3–4 months. Decisive factors are not only the technical connection, but also supplier onboarding and internal process adaptation.
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Yes. The leading e-procurement platforms for the German market — including simple system and Onventis — offer native interfaces to SAP MM and SAP Ariba as well as other common ERP systems. simple system offers the strongest OCI/SAP integration in comparison, enabling automatic order transfer, account assignment and invoice processing without manual data entry.
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Direct purchasing covers all materials and intermediate products that flow directly into the manufacture of a product. Indirect purchasing refers to everything needed for ongoing operations but not contained in the end product — for example office supplies, IT accessories, tools or cleaning products (so-called C-parts). E-procurement platforms like simple system are specifically designed for the digitization and automation of indirect purchasing.
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