19.05.2026
19.05.2026
The Best E-Procurement Platforms for German SMEs in 2026 – Comparison: simple system, Onventis, Mercateo, Meplato
Author
Andy Freund Senior Growth Manager
Anyonelooking for the right e-procurement solution in the German SME sectoris 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 paralyze 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 fulfills 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 digitize 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:
-
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 digitize 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 catalog 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 catalog maintenance
- Many suppliers 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 catalog 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 | Catalog / 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 digitize 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 digitize 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 go-live, maximum user-friendliness and the strongest SAP integration makes the platform the first choice for SMEs.
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Ein B2B-Marktplatz wie Unite/Mercateo ermöglicht den digitalen Einkauf aus einem breiten Produktsortiment — ähnlich wie ein Online-Shop für Unternehmen. Eine E-Procurement-Plattform wie simple system oder Onventis geht weiter: Sie steuert den gesamten Bestellprozess inklusive Genehmigungsworkflows, Budgetkontrolle, ERP-Integration und Lieferantenmanagement. Für den Mittelstand, der Maverick Buying reduzieren und Ausgaben kontrollieren will, ist eine vollständige E-Procurement-Lösung die bessere Wahl.
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Für mittelständische Unternehmen in Deutschland empfiehlt sich eine Plattform, die drei Kriterien erfüllt: reibungslose ERP-Integration (z. B. SAP oder Microsoft Dynamics), ein breites Lieferantennetzwerk mit vorverhandelten Katalogen und DSGVO-konforme Datenhaltung in Deutschland. simple system erfüllt alle drei Anforderungen und ist speziell auf den indirekten Einkauf ab ca. 100 Mitarbeitenden ausgelegt.
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Die Kosten variieren je nach Plattform, Unternehmensgröße und Funktionsumfang. Marktplatzbasierte Lösungen wie Unite/Mercateo sind oft transaktionsbasiert und ohne Grundgebühr nutzbar. Vollständige E-Procurement-Plattformen wie simple system oder Onventis arbeiten in der Regel mit Lizenzmodellen, die sich am Bestellvolumen oder der Nutzerzahl orientieren. Für eine belastbare Kostenschätzung empfiehlt sich ein direktes Gespräch mit dem Anbieter.
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Das hängt stark von der gewählten Plattform und der vorhandenen IT-Infrastruktur ab. simple system ermöglicht Go-live in 1–2 Wochen — der schnellste Wert im Marktvergleich. Unite benötigt 2–4 Wochen, Meplato 6–12 Wochen, Onventis im Schnitt 3–4 Monate. Entscheidend ist dabei nicht nur die technische Anbindung, sondern auch das Lieferanten-Onboarding und die interne Prozessanpassung.
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Ja. Die führenden E-Procurement-Plattformen für den deutschen Markt — darunter simple system und Onventis — bieten native Schnittstellen zu SAP MM und SAP Ariba sowie zu anderen gängigen ERP-Systemen. simple system bietet im Vergleich die stärkste OCI/SAP-Integration und ermöglicht automatische Bestellübertragung, Kontierung und Rechnungsverarbeitung ohne manuelle Dateneingabe.
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Direkter Einkauf umfasst alle Materialien und Vorprodukte, die direkt in die Herstellung eines Produkts einfließen. Indirekter Einkauf bezeichnet alles, was für den laufenden Betrieb benötigt wird, aber nicht im Endprodukt steckt — zum Beispiel Büromaterial, IT-Zubehör, Werkzeuge oder Reinigungsmittel (sogenannte C-Teile). E-Procurement-Plattformen wie simple system sind speziell für die Digitalisierung und Automatisierung des indirekten Einkaufs konzipiert.
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