Companion Mobile App for Your Web Platform

A companion app extends a business's existing web platform to iOS and Android without rebuilding its backend or duplicating its business logic. It fits companies that already have a working web product — a SaaS dashboard, a marketplace, a booking system — and want their users to also access it as a native app, with the same accounts, permissions, and data staying in sync in both places. FreyreSoft builds these apps to connect directly to the platform's existing API, extending it where needed rather than standing up a parallel system, so a change made on the web side, such as a new order or an updated record, appears in the app without a separate sync process. The mobile layer is built in React Native or Flutter, focused on the subset of the platform's functionality that makes sense as a mobile experience, rather than replicating every web screen.

What problem does this solve?

A business with a working web platform often reaches a point where customers or staff expect a mobile app, but building one as a separate system risks accounts, data, and permissions drifting out of sync between web and mobile. Maintaining two independent backends means every business rule — pricing, access control, workflow status — has to be implemented and kept correct twice, and a fix on one side does not automatically apply to the other. This also slows down the product roadmap, since new features have to be built for two systems that were never designed to share logic. The practical result is either an app that lags behind the web product in features, or a support burden from users seeing different data depending on which platform they used last.

How we approach it

FreyreSoft treats the existing web platform's backend as the source of truth and builds the mobile app as a client of the same API, extending it with new endpoints only where the mobile experience genuinely needs something the web frontend does not — such as push notifications or offline caching. Authentication reuses the platform's existing accounts and permission model instead of creating a parallel login system, so a user's access level is identical on web and mobile. The app is scoped to the workflows that make sense on a phone — checking status, approving a request, capturing something on the go — rather than porting every web screen, since a companion app that tries to mirror the full desktop interface usually ends up harder to use than the web version it is meant to complement. Built in React Native or Flutter, it ships to iOS and Android from one codebase.

Technology typically used

• React Native or Flutter
• Existing REST or GraphQL API
• Shared authentication and SSO
• Push notification service
• Offline data caching
• API versioning for mobile clients

What a project like this usually involves

1. Auditing the existing API for mobile readiness
2. Reusing the platform's authentication and permission model
3. Scoping which web workflows belong on mobile
4. Adding endpoints only where the app needs new data
5. Testing that web and app stay in sync under real use

← Back to use cases