The best customer portal software for B2B companies

Nick BaudoinUpdated August 23, 2026

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The short answer

Knack is the best customer portal software for most established B2B companies, because logins are unlimited and pricing is metered on records rather than seats. SuiteDash is the flat-fee alternative, Clinked and SmartVault suit document-heavy portals, HubSpot Service Hub and Zendesk fit when the portal is really a support desk, Moxo handles structured onboarding, and Flowlu bundles a portal with a CRM. Verified pricing for all eight below.

Best customer portal software for B2B companies at a glance

#	Tool	Best for	Pricing	Trade-off
1	Knack	Portals with a lot of customers and real data behind them	From $49/mo annual, unlimited logins	You are building an application, not switching one on. Expect a few weeks of configuration and someone who enjoys structuring data, and the interface you get is functional rather than beautiful without design work on top. Record limits are the meter to watch: a portal logging transactions can consume them faster than a portal storing accounts.
2	SuiteDash	Unlimited clients on a flat monthly fee	From $19/mo, flat rather than per user	The breadth is also the complaint. There is a lot of product here and the setup is not quick, so a team wanting a simple document portal will spend time switching things off. The interface shows its age next to newer tools, and the marketing lands harder than the software does.
3	Clinked	White-labelled document portals with a member count	From $11/user/mo, or $239/mo for 100 members	It is a collaboration and file workspace at heart, so if what you need is order history pulled from an ERP you are pushing it uphill. The jump from Standard to Premium is a large step for features many buyers will want on day one, particularly the custom domain upload and the granular permissions.
4	HubSpot Service Hub	Companies already running HubSpot	Free to 2 users; Starter $7/seat/mo annual	Seats are priced for internal users, and the portal is deliberately a light layer over the ticketing system rather than a place to expose account data. The Professional onboarding fee of $1,500 is a real number that does not appear in most comparisons, and the tier jump from $7 to $90 a seat is steep.
5	Zendesk Suite	Portals that are really a support desk	$55/agent/mo paid yearly	It is priced per agent for a reason: it is support software, and the portal is the customer-facing edge of it. If you want customers to see order status or account documents, this is the wrong shape and you will end up paying support-desk prices for a feature it was not built to provide.
6	SmartVault	Document exchange with compliance requirements	$55/user/mo annual, 3-user minimum	It is built for accounting and professional services and the vocabulary shows it, so a manufacturer will find tax-specific templates and folder structures they will never use. At $55 per internal user a month with a minimum, it is one of the more expensive ways to move files if compliance is not the driver.
7	Moxo	Structured client onboarding and multi-step workflows	$500/mo or $5,000/yr, unlimited seats	Metering on flows rather than users is unusual and needs modelling before you commit, because 250 flows a year is not many for a company onboarding customers weekly. The $500 a month entry point is also the highest floor here, which rules it out for smaller companies regardless of fit.
8	Flowlu	A portal bundled with CRM and projects for a small team	Free to 2 users; $6/user/mo annual	Per-user pricing is on internal users, but the portal is a lighter feature than the dedicated tools here and will not carry a large self-service customer base. Being good at many things means it is not the best at any of them, including this one.

Pricing verified from each vendor’s site, as of Aug 2026. Plans change; confirm current pricing before you buy.

Which is right for you

You have hundreds of customers who each need a login: KnackLogins are unlimited and the meter is on records, so the customer count does not drive the bill. Almost everything else in this category is priced in a way that punishes exactly this.
You want unlimited clients and staff for one predictable fee: SuiteDashFlat pricing rather than per user, with unlimited portals and contacts. Confirm the current tier price before buying, since the per-tier figures did not render when we checked.
The portal is mostly documents and it has to carry your brand: ClinkedMember-count tiers instead of per-seat, a custom domain, and white-labelled notifications, so it reads as your system rather than a rented one.
Your CRM is already HubSpot: HubSpot Service HubFree to two users and $7 per seat a month annually after that, with tickets and contacts already in the same system. The integration is worth more than any feature gap.
What you actually need is a help centre that deflects tickets: Zendesk SuiteThe most mature customer-facing knowledge base here, and the one your customers have most likely used elsewhere.
Document exchange has to survive a security review: SmartVaultUnlimited external collaborators on a per-internal-user price, with the audit trail and controlled sharing that compliance reviews ask for.
Onboarding a customer is a repeatable process that runs on email today: MoxoFlows enforce a defined sequence of steps and documents, with unlimited seats at a flat fee. Model your flow volume first, since that is the meter.

How we ranked these

We build B2B and industrial websites for a living, so we weigh these the way the teams we work with actually experience them. Our criteria:

How the pricing scales with customers, weighted heaviest and the thing most comparisons in this category never mention. A customer portal has more external users than internal ones, often by a factor of fifty. Tools priced per seat are built for internal software and get expensive fast in this use, while tools priced flat, or by records, or by a member count, do not. We separated them on that basis first.
Verified price at a stated volume. Every figure below was read from the vendor's own pricing page and dated. Where a page did not render its per-tier prices we say so and mark the figure lower-confidence, rather than estimating. Nothing here is a number we inferred.
What the portal is actually for. Document exchange, support ticketing, order and quote history, structured onboarding and self-service account data are five different products that all get sold as a customer portal, and a tool that is excellent at one is usually mediocre at another.
Whether it can reach your existing systems. For a manufacturer or distributor the portal is only useful if it can show data that lives in an ERP, so we noted the integration path rather than assuming one exists.
Branding and the URL. A portal on a vendor subdomain with the vendor's logo reads as a bolt-on. We checked whether custom domains and white-labelling are available and on which tier.
Alkali builds custom portals for clients, so we have an interest in the build-versus-buy question. We have tried to answer it honestly below, and in most cases the answer is buy.

The rankings

01Knack

Best for: Portals with a lot of customers and real data behind them
Pricing: Starter is $59 a month billed monthly or $49 billed annually, covering 20,000 database records and 3 apps. Pro is $130 monthly or $110 annually for 50,000 records and unlimited apps. Corporate starts at $250 a month for 125,000 to 2.5 million records, and Enterprise is custom above that. The pricing page states there is no limit on the number of users who can log in to your app. (source)
Standout: The economics are the right shape for this job. Because customers are stored as records rather than charged as seats, going from 40 customers to 400 changes your record count and not your plan, which is the opposite of how nearly everything else here behaves. It is also a database first, so a portal showing order history, equipment lists or documents per account is a build rather than a workaround.
Trade-off: You are building an application, not switching one on. Expect a few weeks of configuration and someone who enjoys structuring data, and the interface you get is functional rather than beautiful without design work on top. Record limits are the meter to watch: a portal logging transactions can consume them faster than a portal storing accounts.
Who it’s for: Manufacturers and distributors giving a large customer base self-service access to their own data, who have the patience for a short build.

Visit Knack

02SuiteDash

Best for: Unlimited clients on a flat monthly fee
Pricing: The pricing page advertises plans from $19 a month across three tiers, START, THRIVE and PINNACLE, and states the fee is flat rather than per user, with unlimited portals, unlimited CRM contacts and unlimited staff. Lower confidence: the per-tier prices did not render when we checked, so confirm the current figure for the tier you want before buying. (source)
Standout: Flat pricing with unlimited clients and unlimited staff is rare, and it is the single biggest cost lever in this category. It also bundles more than a portal: CRM, invoicing, file exchange, project tracking and white-labelled apps, so for a company currently paying for three or four tools the comparison is not against another portal but against the stack.
Trade-off: The breadth is also the complaint. There is a lot of product here and the setup is not quick, so a team wanting a simple document portal will spend time switching things off. The interface shows its age next to newer tools, and the marketing lands harder than the software does.
Who it’s for: Service-led B2B companies with many client relationships and a low tolerance for per-seat billing.

Visit SuiteDash

03Clinked

Best for: White-labelled document portals with a member count
Pricing: Start Up is $11 per user a month with 200 GB storage. Standard is $239 a month including 100 members and 1 TB. Premium is $599 a month including 250 members and 3 TB, adding white-labelled email notifications, custom domain uploads and role-based permissions. Enterprise is on request for 1,000+ members. Annual billing is 20% off and two-year billing 35% off. (source)
Standout: The member-count tiers are the honest middle ground between per-seat and flat: $239 a month for 100 members works out at about $2.39 a customer, which stays sane as the portal grows. White-labelling is genuine, including a custom domain and, at Enterprise, a branded mobile app, so the portal reads as yours rather than as a tool you rented.
Trade-off: It is a collaboration and file workspace at heart, so if what you need is order history pulled from an ERP you are pushing it uphill. The jump from Standard to Premium is a large step for features many buyers will want on day one, particularly the custom domain upload and the granular permissions.
Who it’s for: Companies whose portal is mostly documents, approvals and conversation with a defined client list, and who care that it carries their brand.

Visit Clinked

04HubSpot Service Hub

Best for: Companies already running HubSpot
Pricing: Free for up to 2 users. Starter is $7 per seat a month on an annual commitment or $20 per seat month to month, including 500 HubSpot credits. Professional is $90 per seat a month annually or $100 month to month, including 3,000 credits, plus a one-time onboarding fee of $1,500. Enterprise is custom with a $3,500 onboarding fee. (source)
Standout: If your CRM is already HubSpot, the customer portal is close to free to switch on and every ticket, contact and conversation is already in the same place. That single fact outweighs a lot of feature comparison, because the failure mode of a bolt-on portal is that nobody internally looks at it.
Trade-off: Seats are priced for internal users, and the portal is deliberately a light layer over the ticketing system rather than a place to expose account data. The Professional onboarding fee of $1,500 is a real number that does not appear in most comparisons, and the tier jump from $7 to $90 a seat is steep.
Who it’s for: Existing HubSpot customers who want a self-service ticket and knowledge base portal without adding a vendor.

Visit HubSpot Service Hub

05Zendesk Suite

Best for: Portals that are really a support desk
Pricing: Suite Team is $55 per agent a month paid yearly and Suite Professional is $115 per agent a month paid yearly, both including the help centre, messaging and live chat. Suite Enterprise with Copilot is quoted by sales. Month-to-month billing is available at a higher rate than the annual figures shown. (source)
Standout: The most mature customer-facing help centre in this list, and the one your customers are most likely to have used somewhere else. Ticket deflection through a searchable knowledge base is the part that actually reduces workload, and Zendesk does it better than anything else here.
Trade-off: It is priced per agent for a reason: it is support software, and the portal is the customer-facing edge of it. If you want customers to see order status or account documents, this is the wrong shape and you will end up paying support-desk prices for a feature it was not built to provide.
Who it’s for: Companies whose portal requirement is genuinely support, with enough ticket volume to justify per-agent pricing.

Visit Zendesk Suite

06SmartVault

Best for: Document exchange with compliance requirements
Pricing: Business Pro is $55 per user a month billed annually or $75 billed monthly, with a 3-user minimum, and includes unlimited cloud storage, a custom branded client portal and unlimited external collaborators. Accounting Pro is $65 annually or $85 monthly with a 2-user minimum, and Accounting Unlimited is $85 annually or $110 monthly, adding unlimited e-signatures and ID verification. (source)
Standout: Unlimited external collaborators on a per-internal-user price is the right pricing shape for a document portal, and the compliance posture is the real product. For companies exchanging anything sensitive, the audit trail and controlled sharing are what get the tool through a customer's security review.
Trade-off: It is built for accounting and professional services and the vocabulary shows it, so a manufacturer will find tax-specific templates and folder structures they will never use. At $55 per internal user a month with a minimum, it is one of the more expensive ways to move files if compliance is not the driver.
Who it’s for: Professional services firms and any B2B company where document exchange has a regulatory dimension.

Visit SmartVault

07Moxo

Best for: Structured client onboarding and multi-step workflows
Pricing: The Team plan is $500 a month, or $5,000 a year, including 250 flows a year and 25,000 AI credits, with unlimited seats. Scale includes 1,000 flows and 100,000 credits and is quoted by sales, as is Enterprise. All tiers include unlimited seats. (source)
Standout: Unlimited seats at a flat monthly fee, which is the pricing shape this category should use more often. The product is organised around flows, meaning a defined sequence like onboarding a new account or collecting a set of documents, so the portal enforces a process rather than just hosting files.
Trade-off: Metering on flows rather than users is unusual and needs modelling before you commit, because 250 flows a year is not many for a company onboarding customers weekly. The $500 a month entry point is also the highest floor here, which rules it out for smaller companies regardless of fit.
Who it’s for: Companies where onboarding a customer is a repeatable multi-step process with documents and approvals, and where that process currently runs on email.

Visit Moxo

08Flowlu

Best for: A portal bundled with CRM and projects for a small team
Pricing: Free for 2 users with no expiry. Essential is $6 per user a month billed annually or $12 monthly, Advanced is $11 annually or $22 monthly, and Ultimate is $16 annually or $32 monthly. The page describes the annual discount as a lifetime 25% saving. (source)
Standout: It is the cheapest credible entry point in the list by a wide margin, and the client portal arrives alongside a CRM, invoicing and project management rather than as a separate purchase. For a company running its operations on spreadsheets, the portal is often not even the main reason it turns out to be worth it.
Trade-off: Per-user pricing is on internal users, but the portal is a lighter feature than the dedicated tools here and will not carry a large self-service customer base. Being good at many things means it is not the best at any of them, including this one.
Who it’s for: Small B2B teams who want a client portal as part of an operations toolkit rather than as a standalone system.

Visit Flowlu

Common questions

What is the best customer portal software?

For most established B2B companies it is Knack, because logins are unlimited and pricing is metered on database records rather than seats, so a growing customer base does not grow the bill. SuiteDash is the flat-fee alternative, Clinked suits white-labelled document portals, and HubSpot Service Hub is the obvious pick if you already run HubSpot.

How much does customer portal software cost?

Verified list prices in August 2026 ranged from free, for Flowlu at two users and HubSpot Service Hub at two users, to $6 per user a month for Flowlu Essential, $11 per user for Clinked Start Up, $49 a month for Knack Starter billed annually, $55 per user for SmartVault and Zendesk Suite Team, and $500 a month for Moxo Team with unlimited seats. The unit matters more than the headline: per-seat, per-member, per-record and flat plans diverge sharply once you have a real customer count.

Do I pay for every customer who logs in to the portal?

It depends entirely on the pricing model, and this is the question to ask first. Knack states there is no limit on users who can log in and charges on records instead. SuiteDash and Moxo charge a flat fee with unlimited seats. Clinked charges by member count. Zendesk and SmartVault charge per internal user, with customers not counted as seats. Getting this wrong is how a portal that looked affordable at launch becomes the largest line item on the software bill.

Should we build a custom portal or buy one?

Buy, in most cases. A configured platform is live in weeks against months for a build, and someone else maintains the authentication, the permissions and the security patches, which is the part that quietly costs money for years. The case for building is narrower than it looks: it holds when the portal is the product your customers are paying for, when it has to sit inside an existing application, or when the data model is genuinely unlike anything a platform expects. We build custom portals and still tell most companies to start with a platform.

Can a customer portal show data from our ERP?

Some can, and this is the requirement that eliminates most of the list. Database-first tools like Knack can hold synced data and display it per account, and the integration is usually built through an API or a middleware service rather than natively. Support-led portals such as Zendesk are not designed for this. If showing live order or account status is the point of your portal, test that path before you compare anything else.

What is the difference between a customer portal and a client portal?

Very little, and vendors use the terms interchangeably. In practice client portal tends to describe document exchange and collaboration with a defined list of accounts, common in professional services, while customer portal more often means self-service access to orders, support or account data at larger volumes. The distinction that matters is not the label but how many external users you expect, because that decides which pricing model works.

Sources

Knack, official pricing page.
SuiteDash, official pricing page.
Clinked, official pricing page.
HubSpot Service Hub, official pricing page.
Zendesk Suite, official pricing page.
SmartVault, official pricing page.
Moxo, official pricing page.
Flowlu, official pricing page.

Pricing was read from each vendor’s official pages as of Aug 2026. Plans change often; confirm current pricing before you buy.