IAM (identity and access management) controls how your own employees and contractors access internal systems. CIAM (customer identity and access management) controls how customers sign up for, sign in to and use your product. Both authenticate users and enforce access, but they're built for different users, scale, experience and data rules.
In B2B SaaS the two meet: your customers' employees often sign in to your product through their company's IAM system. A B2B CIAM platform is what connects the two.
CIAM vs IAM at a glance
| IAM (workforce) | CIAM (customer) | |
|---|---|---|
| Who the users are | Employees, contractors, some partners | Customers: consumers or business users at customer companies |
| Who owns the account | Your company (IT creates and removes accounts) | The user, or the customer's company in B2B |
| How users join | Provisioned by HR or IT, often via SCIM | Self-service sign-up, invitations, or the customer's SSO |
| Number of users | Hundreds to hundreds of thousands | Thousands to millions, with unpredictable spikes |
| Sign-in priorities | Security and policy first: SSO, MFA, device checks | Low friction: social login, passwordless, passkeys, plus MFA |
| Data and privacy | Employee data under employment and industry rules | Personal data under privacy laws such as GDPR, with consent management |
| Typical examples | Microsoft Entra ID, Okta Workforce Identity, PingOne for Workforce | Frontegg, Auth0 (Okta), Descope, Microsoft Entra External ID |
What is CIAM (customer identity and access management)?
CIAM manages the identities of people who use your product from outside your company. It covers sign-up and sign-in, profiles, consent, MFA and sessions, and it decides what each customer can access in your application.
A CIAM system has to make sign-in easy enough that customers don't drop off, while protecting accounts from takeover and handling personal data under privacy law. In B2B products it also has to model customer companies: organizations, their users, their roles and their own sign-in settings.
What is IAM (identity and access management)?
IAM manages the identities of your own workforce. It decides which employees and contractors can access which internal applications, systems and data, and it records what they do.
IAM is driven by your IT and security teams: accounts are created when someone joins, changed when they move roles and removed when they leave. Its priorities are least-privilege access, central policy and audit evidence.
CIAM vs IAM: 5 key differences
1. Target audience
IAM serves internal users: employees, contractors and sometimes partners. CIAM serves external users: the customers of your product.
2. Complexity
IAM complexity comes from policy: many internal apps, roles and approval rules. CIAM complexity comes from variety: many sign-in methods, self-service flows, account recovery, and, in B2B, a different SSO setup and set of roles for every customer company.
3. Scalability
Workforce IAM grows with headcount, which is predictable. CIAM grows with your customer base and traffic, which isn't: a launch, a campaign or one large customer can multiply sign-ins overnight. CIAM systems are built for that kind of spike and for user counts far beyond a typical workforce.
4. Security
Both need strong authentication and access control. IAM focuses on insider risk, privileged access and device posture. CIAM focuses on account takeover, credential stuffing, bot sign-ups and fraud, while keeping security steps light enough that customers complete them. Phishing-resistant options such as passkeys help on both sides.
5. Compliance requirements
IAM supports controls that auditors check for internal access, such as SOX access reviews or HIPAA access logging. CIAM has to handle customers' personal data under privacy laws such as GDPR and CCPA: consent, data access and deletion requests, and where data is stored. B2B customers will also ask you for evidence such as SOC 2 reports.
Where IAM and CIAM meet: B2B SaaS
In a B2B product, your users belong to customer companies, and those companies run their own IAM. Their IT teams expect your product to fit into it:
- SSO into the customer's IdP. Users from a customer company sign in through that company's identity provider, such as Okta or Entra ID, over SAML or OIDC. Your CIAM system holds a separate connection for each customer.
- SCIM provisioning. The customer's IAM creates, updates and removes their users in your product automatically, so a departing employee loses access everywhere at once.
- Organizations and roles. Each customer company is a tenant with its own users, roles and settings, isolated from every other customer.
- Delegated administration. The customer's admins manage their own users, SSO and SCIM settings in a self-service portal, instead of filing tickets with your team.
Workforce IAM doesn't do these jobs for your product, and a consumer-focused CIAM setup may not either. That's the gap B2B CIAM platforms are built for. See top SSO providers for B2B SaaS for how vendors approach it.
How to choose between IAM and CIAM
- Who are the users? Your employees and contractors: IAM. Customers using your product: CIAM.
- Who manages the accounts? Your IT team: IAM. Users themselves or customer admins: CIAM.
- What does sign-in need to feel like? Policy-heavy and managed: IAM. Fast, self-service and branded: CIAM.
- Do customer companies need their own SSO, SCIM and admin settings? Then you need a CIAM platform built for B2B.
Most SaaS companies need both: IAM for their own team, CIAM for their product.
Frontegg: CIAM built for B2B SaaS
Frontegg is a CIAM platform for multi-tenant B2B products. It provides sign-in (passwords, passwordless, social login, passkeys and MFA), organizations with roles and permissions, per-customer SSO and SCIM, and an admin portal where your customers' admins manage their own users and settings. Frontegg's trust center lists its SOC 2 Type II and ISO 27001 certifications.
FAQ
Is CIAM a type of IAM?
Yes. CIAM is identity and access management applied to customers rather than employees. It uses the same building blocks, such as authentication, authorization and user lifecycle, tuned for external users.
Can I use my workforce IAM for customers?
It's possible for a few users, but workforce IAM isn't designed for self-service sign-up, millions of users, consent management or per-customer settings. Workforce IAM is usually priced per user per month, which gets expensive at customer scale.
What is B2B CIAM?
B2B CIAM is CIAM for products sold to companies. On top of customer sign-in, it adds organizations, per-customer SSO into each company's identity provider, SCIM provisioning and self-service administration for customer admins.
Is Microsoft Entra ID IAM or CIAM?
Microsoft Entra ID is workforce IAM. Microsoft's CIAM product is Microsoft Entra External ID.
Put this into practice with Frontegg
Frontegg is customer identity and access management (CIAM) for B2B SaaS. It's free up to 7,500 monthly active users, including 5 SSO/SCIM connections.
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