Custom ERP development for European SMEs and enterprises
A modern web-based ERP — built around your processes, with NAV Online Invoice 3.0, Hungarian VAT and EKAER built in. SAP / Microsoft Dynamics / Oracle alternative without a monthly licence. 5-year TCO ~70% lower for a 30-person company.
6 reasons TCO favours custom for European SMEs
SAP / Dynamics / Oracle are international standards, but for a 30-300-person company the monthly licence rarely pays off. Scroll through the main arguments.
Custom ERP — not a SAP licence trap
SAP, Microsoft Dynamics, Oracle: €130–€530 / user / month. A custom ERP is a one-time cost; after that it is yours — no monthly licence. Pays back within the first year for a 50-person company.
Built around your processes
Off-the-shelf ERPs (SAP, Vector, Octopus) are built around generic processes — and you have to adapt to them. A custom ERP flips that: the system is built around your processes, not the other way around.
NAV Online Invoice 3.0, Hungarian VAT, OSS
NAV Online Invoice 3.0, Hungarian invoice numbering, VAT categories (5%, 18%, 27%, AAM, KATA), EU OSS reporting, KIVA / TAO, EKAER, Hungarian fiscal-printer integration — everything a Hungarian ERP needs.
Modern web-based, mobile-ready
Not a 2010-era Windows client but a modern browser-based UI (Next.js / React). From any device (laptop, tablet, phone), with offline capability and automatic sync.
Connects to everything
E-commerce (Shopify, WooCommerce, Shoprenter, UNAS), accounting (Számlázz.hu, Billingo, KulcsSoft, RLB60, Xero, QuickBooks), CRM (HubSpot, Pipedrive), B2B portals, banking APIs (OTP, K&H, Erste). REST / GraphQL / SOAP / EDI — whichever the system exposes.
70% lower TCO over 5 years
For a 30-person company, SAP Business One / MS Dynamics 365 over 5 years costs €130k–€210k (licence + implementation + maintenance). Custom ERP: €21k–€79k initial, ~€8k–€16k / year maintenance. €78k over 5 years instead of €210k.
What a custom ERP covers
Eight core modules that make up your configuration. Not everyone gets all of them — a manufacturer gets production and MES, a distributor gets inventory and procurement, a service company gets project and time accounting.
SAP Business One / MS Dynamics vs. custom ERP
SAP / Dynamics is an international standard, but for European SMEs the monthly licence and the limited process flexibility typically favour a custom ERP at 30-300 employees.
| Aspect | SAP / Dynamics / Oracle | Custom ERP (AppForge) |
|---|---|---|
| Initial cost | €13k–€53k (implementation) | €21k–€79k |
| Monthly licence | €130–€530 / user / month | No licence |
| NAV Online Invoice 3.0 | Partial (module / partner) | Built-in |
| Hungarian VAT, KIVA, EKAER | Add-on | Built-in |
| Process customisation | Limited (config + ABAP) | Unlimited |
| Source-code ownership | ||
| Web-based UI | Partial (Fiori / web client) | Native web (mobile-ready) |
| Vendor lock-in | High | None |
| 5-year TCO (30-person company) | €130k–€210k | ~€78k |
What a custom ERP runs on in 2026
Stack choice is not a matter of taste. The components below will still have developers 5-10 years from now — and your maintenance is not tied to us.
Next.js / React + TypeScript
Modern frontend, server components, mobile-friendly. Easy to staff for on the European developer market.
Node.js / Bun + tRPC / GraphQL
Type-safe APIs, end-to-end inference to the client. Scalable, well-tested.
PostgreSQL + Prisma ORM
Relational core, version-controlled migrations. Time-series database (TimescaleDB) for machine data.
Hetzner / AWS / Cloudflare
EU-region cloud (Helsinki, Falkenstein, Frankfurt), Hungarian Tier IV option for sensitive data.
NAV Online Invoice 3.0
Outgoing/incoming invoice reporting, procurement-side queries, EKAER, KATA / KIVA / TAO logic.
Számlázz.hu / Billingo / KulcsSoft
Hungarian accounting integrations natively — sync, retry, error handling, audit log.
Custom ERP development — frequently asked questions
Starting price €21,000 (1-2 modules: sales + invoicing, ~10 users). Mid-complexity ERP with 5-7 modules (sales, inventory, finance, HR, project): €39,500–€78,900. Complex enterprise ERP with manufacturing, MES integration, BI: €78,900–€263,200. Maintenance 15-25% per year (new features, regulatory updates, security). 5-year TCO for a 30-person company is roughly €78k, vs. SAP Business One at €130k–€210k.
Related solutions
An ERP project rarely lives alone — these are the typical companions.
Custom CRM
Sales pipeline, quoting (CPQ) and marketing automation alongside the ERP.
MegnézemIndustry 4.0 / MES / SCADA
Manufacturing ERP for production clients — OEE monitoring, machine data acquisition, traceability.
MegnézemSystem integration
ERP ↔ e-commerce ↔ banking API ↔ NAV ↔ MES — a unified integration layer with ESB / API gateway.
Megnézem
Request a free ERP audit
Based on a 2-hour interview we tell you where to start — with module prioritisation and a realistic price estimate.