Open Mercato vs Subiekt GT/nexo — Comparison 2026
Last updated: March 2026
Subiekt GT and Subiekt nexo by InsERT are the most popular trade and warehouse management programs in Poland. They handle invoicing, inventory and retail sales well, and thousands of Polish businesses rely on them daily. For basic commercial operations, they're solid, proven tools.
The challenge comes when a business outgrows simple invoicing. Subiekt lacks built-in CRM, a B2B ordering portal, a modern browser-based interface and open APIs for integration. Adding these capabilities means buying separate tools that don't always work together seamlessly.
Open Mercato is an open-source platform that combines CRM, ERP and B2B Commerce in a single system. It runs in the browser, requires no Windows installation, and gives you full control over the source code. For Polish businesses that have outgrown Subiekt — it's the natural next step.
Comparison Table
| Criterion | Open Mercato | Subiekt GT / nexo |
|---|---|---|
| Licence | Open source (free) | One-time licence (~PLN 1,000 / seat) |
| CRM | Built-in — leads, pipeline, contact history | None — requires a separate system |
| B2B portal | Built-in — online ordering for partners | None — requires a third-party solution |
| Hosting | Cloud or self-hosted (Linux/Docker) | Local Windows installation (server + workstations) |
| Open source | Yes — full source code access | No — proprietary software |
| Interface | Modern, browser-based, responsive | Desktop (Windows), classic look |
| Integrations | REST API, webhooks, any connection | Sfera API (InsERT), limited options |
| API | Open REST API | Sfera — paid add-on, local only |
Cost Comparison
| Users | Open Mercato (yearly) | Subiekt nexo PRO (first year) |
|---|---|---|
| 10 users | ~EUR 700 - 1,400 (hosting) | ~EUR 2,300 - 3,500 (licences + InsERT Service) |
| 25 users | ~EUR 1,200 - 2,400 (hosting) | ~EUR 5,800 - 9,300 (licences + service) |
| 50 users | ~EUR 1,800 - 3,500 (hosting) | ~EUR 11,600 - 18,600 (licences + service) |
* Open Mercato costs cover infrastructure (hosting). Subiekt nexo PRO costs based on InsERT pricing (2026) — one-time licence + annual InsERT Service subscription for updates. Does not include additional modules (e.g. Sfera, Gestor).
When to choose Subiekt
- Small Polish trading company (1-10 people), mainly invoicing and warehouse
- Local Windows installation is fine — no need for browser access
- You don't need CRM or a B2B portal
- One-time software budget up to PLN 10,000
- Your accountant uses InsERT's Rachmistrz/Rewizor
When to choose Open Mercato
- Growing beyond 10 people and needing CRM, B2B and better analytics
- You want a browser-based system — no per-machine installation
- You need a B2B portal so partners can place orders online
- Open API and easy integrations with other tools matter to you
- You're looking for a platform that scales with your business — no system swap every 3 years
Outgrown Subiekt? Time for the next step.
Book a free 30-minute call. We'll show how to migrate from Subiekt to Open Mercato with zero downtime.
Book a callSee also: Open Mercato vs SAP | Open Mercato vs Odoo | Open Mercato vs Salesforce | Open Mercato vs HubSpot | Open Mercato vs Dynamics