This week at Romi #3 - Building Multi-Platform App Connectivity

When we first launched our app, simplicity was our guiding light. We started with the absolute basics, built our core features, and steadily grew our user base. But as any developer scaling an application knows, user growth brings new expectations and friction points.

If users encounter friction during authentication or onboarding, they drop off. Over the past couple of years, our approach to app connectivity and authentication evolved significantly to meet our users where they are.

Here is a look back at our journey of adding sign up and calendar connection methods step by step.

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Phase 1: The Foundation (Email and Password)

In the first couple of months, we kept authentication as straightforward as possible. We relied solely on traditional email and password sign ups.

• Why we started here: It required the least amount of external configuration, let us build our core database schema quickly, and gave us full control over user credentials.
• The drawback: Users hate remembering new passwords. Conversion rates suffer when people have to type in a long password and verify their email just to test a new tool.

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Phase 2: Expanding for Convenience (Google and Calendar)

As our product matured, we wanted to reduce friction and tap into daily workflows. We added Google signup and Google Calendar integration.

• The impact: Conversion rates jumped immediately. Allowing users to log in with a single click removed a major barrier to entry.
• The workflow benefit: Because our product relies heavily on scheduling, connecting Google Calendar let users see their events and data inside the app instantly without manual data entry.

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Phase 3: Embracing the Apple Ecosystem

As we developed our mobile and desktop apps, user demographics shifted. A large portion of our user base lives inside the Apple ecosystem and prefers to keep their workflows tied to their Apple ID.

• The fix: We implemented Sign in with Apple.
• Why it mattered: Apple users expect native, privacy-focused login options. Adding this significantly improved our mobile onboarding experience and aligned our apps with platform expectations.

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Phase 4: Going Enterprise (Microsoft and Outlook)

Lately, we have been moving into corporate support. When selling to businesses, we quickly noticed that a massive percentage of companies use Microsoft accounts for work.

To break into this market, we needed Microsoft login and Outlook calendar support. However, integrating enterprise authentication is rarely plug and play.

• The verification hurdle: Getting verified through the Microsoft Partner Program was a real struggle. It involved navigating complex compliance requirements, submitting documentation, and waiting for manual reviews.
• The payoff: After a week of hard work and patient waiting, our verification finally succeeded. Now, corporate users can log in seamlessly using their work credentials and sync their Outlook calendars without a hitch.

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What We Learned

Building flexible app connectivity is a journey that scales alongside your product.

1. Start simple: Email and password are fine for day one when you are validating an idea.
2. Follow your users: Add social logins (Google and Apple) once you need to lower friction and improve consumer conversion.
3. Invest in enterprise readiness: If you want to move upmarket, tackling complex compliance and integrations like Microsoft is worth the administrative headache.

Today, our app can successfully serve individuals and teams across multiple platforms and ecosystems. What authentication providers do you prioritize when building a new product? Let me know in the comments below!