The verdict in three sentences
For a chain of 60 stores onboarding 850 suppliers, a supplier portal SaaS at USD 3,000 to 8,000 a month costs USD 200,000 to 520,000 over 5 years with setup, against USD 350,000 to 560,000 for a custom build (USD 150,000 to 300,000 plus about USD 3,000 to 3,500 a month of support). SaaS wins on price at the low end if your onboarding process is standard. Custom becomes rational once EDI, warehouse-specific logistics data and data portability weigh more than the price gap.
The 5-year cost comparison
| Item | Supplier portal SaaS | Custom build |
|---|---|---|
| Setup | USD 20,000 to 40,000 configuration | USD 150,000 to 300,000 development |
| Monthly cost | USD 3,000 to 8,000, indexed 3 to 5% a year | USD 3,000 to 3,500 support |
| Hosting | Included | USD 300 to 800 a month |
| Cumulative cost over 3 years | USD 128,000 to 328,000 | USD 268,000 to 455,000 |
| Cumulative cost over 5 years | USD 200,000 to 520,000 | USD 350,000 to 560,000 |
| Cumulative cost over 7 years (estimate) | USD 290,000 to 760,000 | USD 430,000 to 660,000 |
| Time to go live | 6 to 10 weeks | 4 to 6 months |
Over 7 years the curves cross, especially if the vendor bills by tier of active suppliers. At 850 suppliers, check the tier: moving to 1,000 suppliers often raises the licence by 20 to 30%. For comparison, a Paris chain of the same size sees SaaS at EUR 130,000 to 160,000 and custom at EUR 160,000 to 200,000 over 5 years.
The three points that tip the decision
| Criterion | SaaS | Custom | Question to ask |
|---|---|---|---|
| EDI onboarding | Standard X12 connectors, 850, 856 and 810 | Exact mapping of your flows and exceptions | What share of your suppliers already trade by EDI? |
| Logistics data | Generic fields, limited extensions | Fields specific to your DCs, pallet patterns, case packs, shelf life | Do your DCs require non-standard data? |
| Onboarding workflow | Configurable steps, few business rules | Quality, buying and legal approval by category | How many steps and roles approve an item? |
| Data portability | CSV export, sometimes paid | Database and code handed over, full export | What do you get back if you leave in 3 years? |
| PIM and ERP integration | Vendor catalogue connectors | Direct integration with your ERP and PIM | Is your ERP on the vendor's list? |
| Enhancements | Vendor roadmap | Your roadmap | Which change do you need within 12 months? |
If you answer "standard" everywhere, choose SaaS. If two of six criteria are specific, custom avoids manual workarounds that often cost more than the licence gap.
Mini case study
Michael, VP supply chain of a 60-store retail chain in New York, manages 850 suppliers and 12,000 active SKUs. His buyers spend 25 hours a week chasing incomplete logistics data, because the DCs require case pack, pallet pattern and minimum shelf life that the SaaS under review cannot make mandatory. At USD 75 an hour loaded over 46 weeks, that is USD 86,250 a year. A custom build at USD 220,000 with USD 3,200 a month of support enforces those fields. Compared with a mid-range SaaS at USD 5,000 a month, it costs about USD 115,000 more over 5 years, but if it halves the chasing, it saves USD 215,600. For Michael, the yearly saving of about USD 43,000 covers the extra cost of roughly USD 23,000 a year from year one.
FAQ
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How much does a custom supplier portal cost in New York in 2026?
Plan USD 150,000 to 300,000 for onboarding, logistics data, approval workflow and ERP connector, at New York rates of USD 150 to 220 an hour. Support runs about USD 3,000 to 3,500 a month.
Is a SaaS at USD 3,000 to 8,000 a month a good choice?
Yes if your process is standard and fewer than 30% of suppliers have specific logistics requirements. Check annual indexation, the supplier tier and the cost of a full data export.
Can we start with SaaS and move to custom later?
Yes, provided the contract guarantees a full export of item data and history. Migrating 12,000 SKUs usually costs USD 12,000 to 25,000 in data migration.
How long does a custom portal take to go live?
Allow 4 to 6 months, including a 3 to 4 week pilot with 30 to 50 suppliers. SaaS deploys in 6 to 10 weeks, but onboarding 850 suppliers takes the same time either way.
Who owns the code and data in a custom build?
You do, if the contract assigns the IP and hands over the source code. Insist on the code living in your own Git repository from the first sprint.
Let's scope your project. Send us your supplier count, EDI flows and the SaaS quote you received, and we will compare line by line and price a custom build, including a nearshore option. 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.
