Every list of vendor portal software ranks on features. Approval workflows, document storage, integrations, dashboards. This one ranks on a single question first, because it’s the question that decides whether the portal is used or ignored: does your vendor have to sign up for anything before they can confirm an order? Disclosure up front: OrderBookApp is ours. It’s on the list and it’s scored the same way as the others.
Six tools, all of them real, all of them used by somebody today. Three of them will be wrong for you and one of them might be right. The section at the end says which is which by situation, if you’d rather skip the middle.
How we scored these
Five criteria, in this order, because the order is the argument.
- Does the vendor have to register before they can respond? Every extra step here costs you response rate, and the cost lands on someone who gets no benefit from paying it.
- Does it work over WhatsApp, or at least over the channel your vendors already answer on?
- Does it handle both sides? Most small businesses buy and sell. A tool that only models purchasing covers half the work.
- Setup effort, measured in your hours, not in the vendor’s marketing copy.
- Price band, stated honestly, including where a price isn’t published.
On that last point: only one price below is verified. Zoho Creator publishes plans starting from around $12 per user per month. Everything else is either quote-based or a paid plan whose figure moves often enough that quoting it here would mislead you. Check the current page before you budget.
Something worth holding in mind while you read the table. Spend Matters found that 60% of suppliers have to log in to at least ten customer portals every month, and Blue Meteor, a vendor with its own point to make, claims that more than 60% of supplier portal implementations miss their adoption targets. Both numbers point the same way. Whatever you pick, the failure mode is silence on the other end, not a missing feature.
| Tool | Vendor sign-up required? | Works over WhatsApp? | Both sides (buy and sell)? | Setup effort | Price band |
|---|---|---|---|---|---|
| SAP Ariba | Yes, network registration | No | Yes, as separate buyer and supplier roles | High, an implementation project | Quote-based, enterprise |
| SourceDay | Yes, supplier account | No | Buyer-led, supplier responds | Medium to high, ERP integration | Quote-based |
| Zoho Creator | Yes, you invite each one | No, unless you build it | Only if you build both apps | Medium, you are the developer | From around $12/user/month |
| Stacker | Yes, portal login | No | Only if you build both | Low to medium, no-code | Paid plans |
| Knack | Yes, portal login | No | Only if you build both | Medium, database-first | Paid plans |
| OrderBookApp | No, acknowledge link works without one | Yes | Yes, one board for both | Low, an afternoon | Free to start, paid plans for teams |
SAP Ariba
The biggest name in the category, and the one whose supplier network is large enough that a proportion of your vendors may already be registered on it. Ariba covers sourcing, contracts, purchasing, invoicing and supplier management, and it does all of it properly. If you’re a buyer with hundreds of suppliers, an audit obligation and a procurement team, this is the kind of system that exists for you.
Pricing is quote-based and shaped for that buyer. Implementation is a project with a timeline, not a signup. The adoption catch is unusual here: your vendors may genuinely be used to Ariba, which helps, but they’re used to it because larger customers made them learn it, and their attention on the network follows order value. A small buyer arriving on a big network does not automatically inherit that attention.
Rule of thumb: below roughly a hundred staff, the cost and the setup will outweigh anything you get back. Above it, put Ariba and Coupa on the same shortlist and run a real evaluation.
SourceDay
SourceDay is narrower and, for the right business, sharper. It focuses on purchase order collaboration: keeping POs, acknowledgements, date changes and price changes in sync between a buyer’s ERP and their suppliers, so that a delivery date moving by four days doesn’t stay unknown until the truck fails to arrive. Manufacturers with a real ERP are the core audience, and that fit is specific rather than accidental.
Gartner has found that 50% of purchase order lines undergo changes after issuance, which is the exact problem SourceDay was built around. If you run NetSuite, Epicor or something similar and your pain is change management on open POs, it deserves a demo.
Pricing is quote-based. The catch is the dependency: without an ERP to integrate with, much of the value has nowhere to land, and your suppliers still need accounts and still need to respond inside the tool. For a business running its purchasing from a phone, this is the wrong shape of solution.
Zoho Creator
A low-code platform for building internal apps, and the most affordable way to construct a vendor portal that looks and behaves exactly as you specify. Published plans start from around $12 per user per month. If you already use Zoho Books or Zoho Inventory, the data sits close to where it needs to be.
You’re the developer here. That’s the honest trade: total control over fields, views and permissions, in exchange for the design work, the maintenance, and the person in your business who becomes the one who knows how it works. Small teams underestimate that last part consistently.
The adoption catch is the same as every build-your-own route. Each vendor needs an invitation, a password and a reason to come back. Some will. The ones who serve forty other customers won’t, and you’ll be maintaining the app and the WhatsApp thread in parallel.
Stacker
Stacker turns an existing Airtable base or Google Sheet into a portal with login-gated views, so each vendor sees only their own rows. It’s the fastest good-looking result on this list: a working portal in a weekend, without writing code, and with an interface your vendors won’t mock. Pricing is on paid plans.
It suits a buyer who already keeps orders in Airtable and wants to stop emailing PDFs. The underlying data stays somewhere you can edit directly, which is reassuring when something needs fixing at 9pm.
Then launch day arrives. The portal is only as good as the vendor’s willingness to visit it, and a supplier serving sixty customers cannot log into sixty portals, as the Leverage blog put it. Stacker doesn’t solve that, and it doesn’t claim to. What it gives you is a professional front door, if your vendors are the kind who’ll walk through it.
Knack
Knack is in the same family as Stacker with a different centre of gravity: it starts from the database rather than from a spreadsheet, so relationships between orders, deliveries and invoices can be modelled properly, with roles and permissions per user type. Paid plans, no published figure worth quoting here.
Choose it over Stacker when your data has real structure to it, when several user types need different views, or when you expect the app to keep growing past the first version. The build takes longer and the result holds together better.
The catch, again, is the login. Everything above the vendor’s front door is a matter of taste; everything at the door is adoption, and Knack asks the same of your suppliers that every buyer-built portal does. Budget as much thought for getting vendors in as you spend building the thing.
OrderBookApp
Ours, as stated at the top. It’s a shared order book: one record per order, visible to the business that placed it and the business that received it, moving through placed, confirmed, dispatched, delivered, invoiced and paid. When your vendor isn’t on the app, the order reaches them over WhatsApp with a link that lets them acknowledge in one tap, no account created. When they are, they work their own board, and the same order updates on both sides. Free to start, with paid plans once you add a team.
Both sides are the point. The same board holds the orders you place and the orders you receive, which matters if you buy materials in the morning and ship customer orders in the afternoon, as most small trading and manufacturing businesses do.
The honest catch: it’s an order book, not a procurement suite. There’s no compliance document management, no supplier risk scoring, no sourcing events and no approval hierarchy for a finance department to configure. If your reason for shopping is an audit requirement, buy Ariba or Coupa and don’t look back.
Which one to pick
By situation, briefly, because this is the part people scroll to.
- Manufacturing with an ERP, and open POs that keep changing: look at SourceDay first.
- Procurement team, audit obligations, hundreds of suppliers: Ariba, alongside Coupa and Ivalua on the same shortlist.
- You want to design it yourself and your vendors are large enough to log in: Stacker if you live in Airtable, Knack if the data is structured, Zoho Creator if you’re already in Zoho.
- Your vendors answer on WhatsApp and ignore everything else, and you also take orders from customers: a shared order book is the only option here that doesn’t start with a login screen.
- Fewer than five vendors and one person placing orders: a spreadsheet, honestly. Read what a small business actually needs before you spend anything.
Whichever you shortlist, test it on two vendors before you roll it out to eleven. Pick your most responsive vendor and your least responsive one. The first tells you whether the tool works. The second tells you whether it works in your business, which is a different question and the only one that matters in March.
Keep reading
- Vendor portal for small business: what you actually need narrows the requirement to five questions before you shop.
- Why vendor portals fail is the adoption argument behind the first column of the table.
- Vendor portal examples shows what Walmart, Amazon and the supplier networks ask of a supplier in practice.