How to choose an SSO provider: a buyer's checklist

Choosing a single sign-on provider is one of those decisions that looks simple from the outside and turns out to govern your security posture for years. The right one collapses a sprawl of logins into one governed front door. The wrong one becomes a tool you fight, full of apps it can't quite cover and access it can't quite revoke. The difference comes down to asking the right questions before you sign anything, so here is the checklist to take into every demo.

Does it support the protocols your apps actually speak?

This is the first filter, because an SSO provider that can't connect to your applications is just an expensive login page. The two standards that matter are SAML 2.0 and OpenID Connect (OIDC). SAML is the long-established enterprise standard; OIDC is the modern, lighter-weight layer built on OAuth 2.0 that most newer SaaS apps prefer.

Ask:

• Does it support both SAML and OIDC, so it can broker whatever each app speaks?
• Can it handle the specific tools you depend on today, and the ones you'll likely add?
• For internal or legacy apps that speak neither protocol, is there a way to put them behind the same sign-on?

If a provider only does one protocol, you'll eventually hit an app it can't cover, and every uncovered app is a login that escapes your policy.

How strong, and how flexible, is the MFA?

Single sign-on is only as safe as the authentication behind it. A provider should let you require multi-factor authentication across everything behind the sign-on, not as an afterthought you bolt onto individual apps.

Ask:

• Which factors are supported? Look for authenticator apps, passkeys, and hardware security keys, not just SMS codes (which are phishable).
• Can you go passwordless where it makes sense, leaning on passkeys instead of a master password?
• Does it support step-up authentication, prompting for a stronger factor only when someone reaches a sensitive system or performs a risky action?

The goal is comprehensive coverage with friction applied where it's warranted, not a blanket prompt that trains people to click through.

Can it provision and, critically, deprovision people?

Granting access is the easy half. The half that actually protects you is taking it away cleanly when someone leaves or changes roles. This is where many ad-hoc setups quietly fail: people accumulate access nobody remembers to remove.

Ask:

• Does it support automated provisioning (often via SCIM) so new hires land in the right apps in one action?
• Can you deprovision everywhere at once, cutting off all access the moment someone departs?
• Does it sync group and role changes, so a move between teams updates access automatically?

Fast, complete offboarding isn't a nice-to-have. It closes the gap that orphaned accounts leave open.

How granular is access management?

A good provider lets you express who should reach what as policy, not as a pile of manual exceptions. Role-based access control (RBAC) is the baseline: you grant access by role or group rather than person by person.

Ask:

• Can you assign access by group or role and have membership drive entitlements?
• Can you enforce least-privilege defaults, so people get only what their role needs?
• Can policies vary by context, such as the resource, the user's group, or how sensitive the action is?

When access is governed by clear roles, audits and reviews become a report instead of an investigation.

Will it show you who did what?

If you can't see access, you can't govern it, and you certainly can't prove it to a client or auditor. Logging is not a luxury feature.

Ask:

• Is there a complete audit trail of sign-ins, grants, and revocations?
• Can you answer "who accessed what, and when?" from a single console?
• Can you export logs for review or evidence?

Does it handle clients and external users, not just staff?

Many businesses need to give both employees and clients secure access: to a portal, a shared workspace, a delivered application. Plenty of SSO tools are built only for internal staff and make external access awkward or insecure.

Ask:

• Can you onboard clients and external collaborators under the same governed identity layer?
• Can you keep their access cleanly scoped and separate from internal systems?
• Is offboarding an external user just as fast and complete as offboarding staff?

What about hosting and network access?

The most sensitive tools (internal apps, admin panels, anything that should never sit on the open internet) raise a question SSO alone doesn't answer: where do they live, and how do people reach them safely?

Ask:

• Can the provider offer isolated application hosting, so sensitive apps run behind the same identity layer rather than exposed to the public web?
• Is there secure private network access that's identity-gated, rather than a broad VPN that trusts anyone who connects?
• Does putting an app behind the sign-on mean it's genuinely unreachable without authenticating first?

Consolidating the platform that hosts your apps with the one that gates them removes a whole category of misconfiguration.

How does pricing work, and what's the support like?

Finally, the practical questions that decide whether you'll actually succeed with the tool.

• Is pricing per user, per app, or tiered, and does it stay sane as you grow and add clients?
• Are core security features (MFA, audit logging) included, or paywalled behind a premium tier?
• What does onboarding look like: will someone help you connect your apps and set policy, or are you on your own?
• What's the support model when something breaks at a bad time?

A provider that nickel-and-dimes the security basics, or leaves you to integrate alone, costs more than its sticker price.

Where Clavkey fits

Clavkey is built to answer this checklist as one system rather than a stack you assemble yourself. Staff and clients sign in once, protected by MFA (authenticator apps, passkeys, and hardware keys) with step-up where it matters. You provision and deprovision people from a single console, grant access by role, and read a full audit trail in one place. For tools that should never touch the open internet, Clavkey adds isolated hosting and identity-gated network access behind the same sign-on.

If you're weighing providers, bring this checklist to the conversation. Talk to us and we'll walk through exactly how Clavkey handles each item for your team and your clients.