Technology · Mobile Apps

One codebase. Both stores.

Cross-platform mobile apps built in Flutter — native performance on iOS and Android, half the development time of native, single team to maintain. Built for SMBs that need real tools and startups that need to ship.

Cross-platform mobile app development with Flutter for SMBs and startups in San Diego and Tijuana

The honest math

Native is great. It's also twice the cost.

If you go native, you build the same app twice — once for iOS in Swift, once for Android in Kotlin. Two codebases, two teams, two maintenance streams, two release cycles. For most SMBs and startups, this math doesn't work. You don't need an app twice. You need one app that works on both phones.

Flutter solves this without compromise. Google maintains it, Toyota and BMW ship apps on it, and the performance is indistinguishable from native for 90% of use cases. One codebase compiles to native iOS and native Android. One team maintains it. One release goes to both stores.

~50%

Less development time vs native iOS + Android separately

~40%

Lower long-term maintenance cost

1 team

Same engineers ship to both stores, fix bugs once

When native is the right answer, we'll tell you. For most projects, it isn't.

What we build

Apps that do real work.

Type 01

Customer-facing apps

Booking, ordering, loyalty, marketplaces, content delivery. The app is the product or the storefront.

  • · User accounts and profiles
  • · Push notifications
  • · Payments (Stripe, Apple Pay, Google Pay)
  • · Real-time data and chat

Type 02

Operational apps

Field service, delivery dispatch, inventory check-in, sales rep tools. Apps your team uses to do their job.

  • · Offline mode and sync
  • · Camera, barcode, GPS
  • · Forms and signatures
  • · Connection to your ERP/CRM

Type 03

Startup MVPs

Lean, focused first versions for startups testing a hypothesis. Built to validate, iterate, and grow.

  • · Core flow first, polish later
  • · Analytics from day one
  • · Architected to scale
  • · Ready to demo to investors

Type 04

Companion apps

Mobile companions for existing web platforms — letting your customers or staff access the system from their phone.

  • · Shared backend with web app
  • · Mobile-optimized flows
  • · Push notifications and alerts
  • · Quick actions on the go

Type 05

Internal team apps

Apps for warehouse staff, drivers, technicians, sales teams. Distributed via private channels, not public stores.

  • · Enterprise distribution (no app store)
  • · Role-based access
  • · Custom workflows per team
  • · Direct integration to internal systems

Foundation

Backend & API

Every app needs a backend. We build it in Python or Node.js, hosted reliably, integrated with the rest of your stack.

  • · REST APIs and webhooks
  • · Authentication and security
  • · Database and storage
  • · Connection to your existing systems

How we build

Designed for users. Built for stores.

Principle 01

Native feel on both platforms

iOS users expect Cupertino interactions. Android users expect Material Design. We respect platform conventions where it matters and use shared design where it doesn't. The app feels right on each phone.

Principle 02

Built for the App Store gauntlet

Apple and Google reject apps for vague reasons all the time. We know the patterns: privacy permissions, data handling, sign-in requirements, in-app purchase rules. Apps we build are designed to pass review the first time.

Principle 03

Offline-first when it matters

Drivers in dead zones, warehouse staff in steel buildings, sales reps on a flight. Apps that need to work without internet need to be designed that way from the start. We architect offline mode into the data model, not as an afterthought.

Principle 04

Analytics from day one

Every app ships with analytics built in — what users tap, where they drop off, what fails. You launch with visibility, not blind. Especially critical for MVPs where understanding user behavior is the whole point.

The stack

Modern. Stable. Yours to own.

Mobile

  • Flutter
  • Dart
  • iOS & Android

Backend

  • Python (FastAPI, Django)
  • Node.js
  • REST APIs

Data

  • MySQL
  • PostgreSQL
  • Local SQLite for offline

Authentication

  • Custom JWT
  • OAuth providers
  • Sign in with Apple/Google

Payments

  • Stripe
  • Apple Pay / Google Pay
  • In-app purchases

Distribution

  • App Store
  • Google Play
  • Enterprise / TestFlight

Honest guidance

Should you actually build an app?

Not every business needs a mobile app. Sometimes a mobile-friendly website does the same job for one-tenth the cost. We'll tell you the truth on the discovery call. Here's our honest framework:

Build an app if…

  • Your users open it weekly or daily (not just once)
  • You need camera, GPS, push notifications, or offline mode
  • Your customers expect an app (booking, delivery, loyalty)
  • Your team works in the field and needs purpose-built tools

Skip the app if…

  • ×Users would only open it occasionally — a website is enough
  • ×You don't need any device-specific features
  • ×You're not ready to maintain it long-term (apps need ongoing care)
  • ×You're building it because a competitor has one — not because users asked for it

A recent build

A clinic team that needed to work from anywhere.

Mobile companion app for a healthcare clinic CRM
HealthcareCompanion app

The clinic's staff needed to access patient data and update records when away from their desks. The web platform worked, but on a phone it was clunky. They needed a real mobile companion that respected the way clinical staff actually work — short bursts of attention between patients.

What we built

  • ·Flutter app shipped to iOS and Android from one codebase
  • ·Direct connection to the existing CRM and clinical engagement platform
  • ·Push notifications for new appointments and follow-up reminders
  • ·Quick-action flows optimized for one-handed use

Currently in deployment. Built alongside the web platform, sharing the same backend.

Common questions

What people ask before signing.

Why Flutter and not React Native or native development?+

Flutter gives you near-native performance on both iOS and Android from one codebase. React Native is fine for simpler apps but struggles with complex UI and animations. Native development (Swift + Kotlin) is twice the work and twice the cost — only worth it for apps with deep platform-specific requirements. For 90% of SMB and startup use cases, Flutter is the right choice. We'll tell you honestly if your app falls into the 10% that needs native.

How long does a mobile app take to build?+

A focused MVP with 5 to 8 screens takes 6 to 10 weeks. A mid-complexity app with custom logic, payments, and integrations takes 10 to 16 weeks. Larger apps with offline mode, complex sync, and platform-specific features can range 16 to 24 weeks. We give you a clear timeline after the discovery call.

Do you handle App Store and Google Play submission?+

Yes. We handle the full submission process to both Apple App Store and Google Play, including the screenshots, store listings, privacy policy compliance, and review feedback. App Store rejections are common — we know what to avoid and how to respond when they happen.

What about updates and maintenance after launch?+

Mobile apps need ongoing maintenance — iOS and Android push major updates yearly that can break apps. Every project includes 30 days of post-launch support. After that, we offer monthly retainer plans for continuous maintenance, feature updates, and OS compatibility. You can also call us on demand.

Do I own the code?+

Yes. The Flutter source code, backend code, design files, and deployment configurations are all yours from day one. Your App Store and Google Play developer accounts are registered in your name, not ours. If we ever stop working together, you can hand the project to any other Flutter developer and they can continue from where we left off.

Free discovery call · 30 minutes

Tell us what your app needs to do.
We'll tell you if it should exist.

30 minutes. No pitch. We map your users, your goals, and your budget — then tell you honestly whether an app is the right answer or whether something simpler would do the job.

Book the discovery call

Or email us at cs@ink-stains.com

Chat with us — we reply fast