SSO login

Why SSO is a B2B Growth Lever

SSO reduces friction to zero. A user clicks 'Continue with Google', and their account is created--no forms, no password to invent, no email to verify. This simple UX improvement can significantly lift your signup conversion rate, especially for team-based products where you want everyone to get in and start collaborating instantly.

More importantly, SSO is a security feature that acts as a sales feature. IT departments at large companies don't want their employees creating dozens of separate accounts with weak passwords. SSO lets them enforce their own security policies and manage user access centrally. For many companies, SAML-based SSO isn't just a nice-to-have; it's a mandatory checkbox for procurement. Lacking SSO can get you disqualified from deals instantly.

Three real examples

Gating SAML-based SSO (Okta, Azure AD) on an 'Enterprise' plan is a standard and effective way to create a powerful upgrade incentive for your largest customers.

The step-by-step playbook

1. 1

   Step 1: Gauge customer needs

   Before you write any code, figure out which SSO providers your customers or prospects use. Is it Google and Microsoft (OAuth), or do they need SAML-based providers like Okta and Azure AD? Use a simple survey for current users or ask during sales calls.

2. 2

   Step 2: Choose your identity platform

   Don't build everything from scratch. Use a service like Auth0, WorkOS, or Okta. They provide unified APIs and SDKs to handle various SSO protocols, saving you immense development and maintenance time. Most have generous free tiers to get you started.

3. 3

   Step 3: Design the login UI

   Update your login and signup pages. Add prominent 'Continue with {Provider}' buttons. Don't hide them--make them the easiest and most obvious choice. Keep the traditional email/password option visible but secondary.

4. 4

   Step 4: Implement the authentication flow

   Using the SDK from your chosen platform, implement the backend logic. This typically involves redirecting the user to the SSO provider and then handling the callback, which contains the user's information and a security token.

5. 5

   Step 5: Handle user provisioning and account linking

   When a user signs in via SSO for the first time, you need to create an account for them in your database. Decide how to handle existing users who switch to SSO--provide a way for them to link their new SSO login to their old email/password account.

6. 6

   Step 6: Test the end-to-end flow

   Test the entire process: new user signup, existing user login, account linking, and error handling. What happens if the SSO provider is down? What if the user denies access? Test these edge cases.

7. 7

   Step 7: Update your pricing page and marketing

   Decide which plan SSO will be on. For many B2B SaaS, OAuth (Google/Microsoft) is on all plans (even free), while SAML SSO is reserved for a higher-tier 'Enterprise' or 'Team' plan. Announce the new feature on your blog, social media, and in your newsletter.

How to Ask Customers if They Need SSO

Send this email to your largest customers or most promising leads to validate demand and prioritize which SSO providers to build first.

Subject: Quick question about logins at {customer_name}

Hi {customer_name},

My name is {your_name}, I'm the founder of {your_product}.

We're planning our product roadmap and looking to add single sign-on (SSO) to make signing in easier and more secure for teams.

Do you typically require SSO (like Okta, Azure, or Google) for new software you adopt? Learning what you use would help us prioritize.

Thanks for the insight!

Best,
{your_name}

Key Questions to Answer First

• Which SSO providers are most requested by our target customers?
• Should we offer basic social SSO (Google/Microsoft) on all plans?
• Should we gate SAML/enterprise SSO on a higher-tier plan?
• How will we handle merging existing email/password accounts with SSO logins?
• What is our plan for de-provisioning users when they are removed from a customer's directory?

The most important first step is validating which providers your actual customers use. Don't build for Okta if all your customers are on Google Workspace.

Recommended tools

Prices are indicative and change - check the vendor before buying.

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Mistakes that kill this play

• ×Hiding SSO on a very expensive plan that your target startup/SMB customers can't afford.
• ×Failing to provide a way for existing users with passwords to link their accounts to an SSO provider.
• ×Making the SSO buttons small or hard to find on the login page.
• ×Not handling error states, such as when the SSO provider has an outage or a user's token is invalid.
• ×Only building for one specific provider (e.g., just Google) when your customers also need Microsoft or Okta.
• ×Neglecting to implement proper security measures, like state parameter validation, to prevent CSRF attacks.
• ×Forgetting to announce the feature. Your customers won't use it if they don't know it exists.

Your First 7 Days

• Day 1: Use Tally.so to create and send a one-question survey to your active users: 'Which SSO provider does your team use?'
• Day 2: Sign up for a free developer account with Auth0 or WorkOS. Explore their documentation and quick-start guides for your tech stack.
• Day 3: Create a simple wireframe or mockup of your new login and signup pages, showing the placement of the 'Continue with...' buttons.
• Day 4: Set up a basic proof-of-concept. Use a sample app or your dev environment to implement a simple 'Login with Google' flow.
• Day 5: Map out the user provisioning logic. What data do you get from the SSO provider? How does it map to your user model? How do you handle first-time vs. returning users?
• Day 6: Decide which plans will include SSO (e.g., OAuth on all plans, SAML on Enterprise). Update a draft of your pricing page.
• Day 7: Review survey results from Day 1 to confirm which providers you need to support first.

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