April 22, 2026 · 9 min read
SAP vs Custom ERP: When to Pick Which (2026)
Makrops Engineering Team
Software, 3D and AI engineering · Istanbul / Berlin / New York
The classic dilemma for mid-to-large Turkish manufacturers: SAP vs custom ERP. SAP buys brand; cost and flexibility are the bill. Custom ERP buys flexibility; responsibility is on you and your partner.
1. Short answer
- 300+ users, global ops, 15+ country localization → SAP (or S/4HANA)
- 50-300 users, operational processes are your edge → custom ERP (or Odoo/ERPNext + customization)
- < 50 users → SAP is overkill; use Odoo, Logo, Business One, Netsis
2. Side by side
| Criterion | SAP | Custom |
| Upfront | €250k – €2M+ | €80k – €500k |
| Annual license (100 users) | €80k – €400k | €0-low |
| Timeline | 9-24 mo | 6-16 mo |
| Flexibility | Low-mid | Very high |
| Upgrade risk | Low (vendor-managed) | Mid |
| Vendor templates | Huge | Build or open-source base |
| Ecosystem | Massive | Smaller, agile |
| Vendor lock-in | High | Low |
| 5-yr TCO (100 users) | €800k – €3M | €300k – €900k |
3. SAP's real strengths
Industry templates, global localization, best-practice reference, massive consultant pool, audit/compliance credibility.
4. SAP's real weaknesses
Expensive customization, process conformity, costly upgrades, dated UX feel, slow change cycles.
5. Custom ERP real strengths
Process-fitting software (not the other way), weekly release cadence, modern stack, easy integrations, 40-60% lower 5-year TCO, no lock-in.
6. Custom ERP real risks
Wrong partner = lost years, internal product ownership required, template built from scratch, doc+test discipline critical.
7. Hybrid model — 2026 growing trend
SAP core (finance, procurement, HR) + custom edge (MES, WMS, special planning). Connect via SAP BTP + APIs.
8. Decision matrix
| Process differentiation | Change speed | Pick |
| High | High | Custom |
| High | Low | Custom (modular) |
| Low | High | Hybrid |
| Low | Low | SAP or mid-market package |
9. 12-month zero-risk pilot
Pick one differentiated module, build custom + bidirectional sync to SAP, migrate users, measure KPIs, then decide.
10. Questions to ask yourself
Annual ABAP days needed? Partner bankruptcy risk? Can my edge BE a piece of software? Do I want "SAP best practice" or my own best practice?
*Makrops delivers custom ERP and hybrid SAP-edge projects for manufacturers, exporters and logistics companies. Contact us.*