The verdict in three sentences
For a seminar and congress agency in Amsterdam running 70 events a year for 25,000 attendees, an off-the-shelf platform billed at 1 to 4 EUR per attendee costs 25,000 to 100,000 EUR a year. A custom build at 35,000 to 70,000 EUR connects registration, accommodation, transport and budgets, and shows the margin of each event in real time. The right choice mainly depends on the share of complex congresses (multi-session, exhibitors, hotel blocks) in your business.
What a MICE agency must run in a single tool
An agency working for scientific societies, federations and corporates often uses 5 or 6 tools: a registration module, spreadsheets for hotel rooms, emails for transport, accounting for supplier invoices. The real margin is only known 2 or 3 months after the event.
| Module | Use | Share of custom budget (2026 estimate) |
|---|---|---|
| Online registration and payment | Member rates, early bird, automatic invoices | 20% |
| Accommodation | Room blocks, allocations, rooming lists, attrition | 15% |
| Transport | Shuttles, trains (Amsterdam Centraal), Schiphol transfers | 10% |
| Programme and speakers | Sessions, rooms, contracts, speaker expenses | 15% |
| Forecast vs actual budgets | Supplier commitments, variances, margin per event | 20% |
| QR badges and access control | Printing, scanning at entry and in rooms, attendance certificates | 10% |
| Exhibitors and sponsors | Booths, packages, invoicing | 10% |
Hotel attrition is the most expensive item when poorly tracked: a 300-room block reserved for a congress near the RAI, with an 80% clause, can cost several thousand euros if registrations fall short.
Off-the-shelf platform or custom: the comparison
| Criterion | Off-the-shelf platform | Custom build |
|---|---|---|
| Initial cost | 0 to 5,000 EUR setup | 35,000 to 70,000 EUR |
| Annual cost (25,000 attendees) | 25,000 to 100,000 EUR | 6,000 to 12,000 EUR (hosting + maintenance) |
| Payment commission | 1.5 to 3% depending on vendor | Bank fees only (about 1.4%) |
| Budgets and margin per event | Rarely included | Native |
| Accommodation and transport | Paid add-ons or missing | Included |
| Go-live time | 1 to 4 weeks | 4 to 6 months |
| Cumulative 4-year cost | 100,000 to 405,000 EUR | 59,000 to 118,000 EUR |
An agency mostly running simple corporate seminars can stay on a platform. Once congresses exceed 30% of the business, custom becomes clearly cheaper.
The steps of a successful project
Start with registration and budgets, tested on 3 mid-sized events. Accommodation and transport follow, then badges and exhibitors before the September congress season. Attendee data (dietary needs, contact details) falls under GDPR: limited retention and deletion after the event.
Mini case study
Sanne, managing director of an event agency in Amsterdam, currently pays 2.50 EUR per attendee to her platform, or 62,500 EUR a year for 25,000 attendees, plus 2% commission on 1,800,000 EUR of registration fees, or 36,000 EUR. Total: 98,500 EUR a year. With a 60,000 EUR custom build and 10,000 EUR of annual maintenance, plus 1.4% bank fees (25,200 EUR), she spends 95,200 EUR in year one, then 35,200 EUR a year. Savings from year two: 63,300 EUR a year, not counting budget overruns caught during the event.
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FAQ
Can the software handle member and non-member rates for a scientific society?
Yes, with membership number checks and date-based tiered pricing. Budget 2,000 to 4,000 EUR if the member directory must be synced.
How are QR badges produced?
Each registration generates a QR code sent by email and printed on site. In-room scanning issues continuing education certificates, often required for medical congresses.
Can margin be tracked during the event?
Yes, every supplier commitment is entered with its amount and compared to the budget. Variances above 5% trigger an alert.
Is online payment secure?
Payment goes through a PCI DSS certified provider (Stripe, Adyen or a bank) with 3D Secure and iDEAL. The agency stores no card data.
How long does project manager training take?
One day is enough for project managers, half a day for the welcome team scanning badges.
Let's scope your project. Share your number of events, attendees and current tools: we will price a custom build between 35,000 and 70,000 EUR, delivered before your next congress season. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
