"What does a supplier portal cost?" is a question that often only comes up when the procurement inbox is bursting at the seams. Certificates, order confirmations and invoices come in loose, and nobody is sure whether everything is complete. A portal solves that, but what does it cost? Here are concrete ranges for the three routes in 2026, including the costs that only surface later.
The three routes and their price tags
1. Development agency: €15,000 – €40,000
A custom supplier portal from a development agency starts around €15,000 for a basic version (suppliers log in, view order status, upload documents) and climbs toward €40,000 once integrations with your ERP, approval workflows or supplier onboarding are added. At hourly rates of €80–€150, every change counts.
What's not in the quote: maintenance (often 15–20% of the build cost per year), extra work when procurement processes change, and the lead time of three to six months.
2. Off-the-shelf SaaS: supplier portal module per supplier per month
Large ERP and procurement suites offer a supplier portal module as a byproduct. It looks attractive because you "just take it along," but the license charges per supplier and the module is often clunky: lots of fields you don't use, and not quite the document flow your process calls for. Count on per-supplier fees that grow with every new supplier.
What's not in the price: the implementation hours of a consultant, the features you miss, and the exit costs if you ever want to switch (your supplier data sits in their system).
3. AI-built custom: from €99 per month
The newest route: an AI development team like Turtleship builds a custom portal within a subscription. You start with a ready-made supplier portal building block (suppliers log in, order status, document upload for certificates and invoices, onboarding) and build out from there step by step — with an estimate before every step, so you're never caught by surprise.
The honest story: here too, a portal with many ERP integrations and exceptions takes more build steps (credits) than a simple portal. The difference sits in the predictability — you see the estimate before you sign off — and in the absence of hourly rates and price-per-supplier.
The comparison at a glance
| Agency | Off-the-shelf SaaS | AI-built custom | |
|---|---|---|---|
| Startup cost | €15,000–€40,000 | €0 (module) + implementation | €0 (free start) |
| Ongoing | 15–20% maintenance/year | per supplier per month | from €99/month |
| Lead time | 3–6 months | weeks (config) | days (basic) – weeks |
| Fits your procurement process | yes | partly | yes |
| Owner of code & data | usually you | the supplier | you |
| Changes | extra-work quote | wait for the roadmap | new request, estimate up front |
Worked example: 80 suppliers in your portal
Abstract ranges only become concrete once you run the numbers. Suppose you're a manufacturing company with 80 suppliers who view order status, submit certificates and upload invoices.
- Off-the-shelf SaaS: at an average €10 per supplier per month you pay €800 per month, or €9,600 per year. Structural, and the bill grows with every new supplier — plus one-off implementation via a consultant.
- Agency custom: a one-off of around €28,000 for a portal of this size, plus 15–20% maintenance per year (€4,500–€5,500). The number of suppliers doesn't matter, but every change is an extra-work quote.
- AI-built custom: from €99 per month (€1,188 per year), regardless of the number of suppliers. Extensions go per build step, with an estimate up front.
Over three years: SaaS comes out around €28,800 plus implementation, the agency around €42,000 (build plus maintenance), and the AI route starts at about €3,600. In fairness: a portal with deep ERP integration takes extra build steps on the AI route and therefore costs more than the entry rate. But even with a generous margin, the difference stays an order of magnitude.
What to look for (whichever route you choose)
- Ask about the price of change number five. The build cost is one thing; what does it cost when, after three months, you want an extra document type or approval step? That's where the real difference between the routes sits.
- Supplier data is confidential. Contracts, price agreements and certificates fall under GDPR and under contractual confidentiality. Hosting within Europe and a GDPR-compliant setup should be standard, not optional.
- Do the exit math. Who owns the code? Can you take your supplier data with you? A low entry price with lock-in is more expensive than it looks.
Conclusion
A supplier portal no longer has to be a €30,000 project in 2026. The agency route still makes sense for very complex portals woven deep into your ERP with a generous budget. For most small and midsize businesses the math is different now: an AI-built custom portal, from €99 per month, production-ready and yours. Set that against what having software built costs in general, and a portal subscription quickly comes out ahead.
A supplier portal, by the way, isn't the only building block: in the same way you set up a client portal or a custom employee portal. And if you want to compare client portal prices first, read what a client portal costs.
Curious how it works? Take a look at the supplier portal page or start free and see a working foundation within days.