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Mobile app development company

Apps people keep using

Have an app idea, or an app that is holding your business back? As a mobile app development company, we plan, design and build iOS and Android apps, publish them to the App Store and Google Play under your name, and keep them fast and current after launch.

Get a free app proposal

Tell us what the app should do and who it is for. We usually reply within two hours.

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What a mobile app development company gets right before writing code

Custom mobile app development turns a job your customers or staff do every day into something they can finish in seconds on a phone. A good app development agency starts with that job rather than the technology: who opens the app, what they need in the first thirty seconds, and what brings them back tomorrow. That holds for apps your customers use, like booking, ordering or loyalty apps, and for apps your team uses, like field service, inspection or inventory apps. People delete apps that waste their time, so three things decide whether yours stays.

01

A reason to open it

One job the app does better than a website, with every screen designed around finishing it fast.

We define it
02

Code that holds up

Flutter, React Native or fully native code, chosen for the product, so the app stays fast as users and features grow.

We build it
03

Life after launch

Store listings, analytics, crash reports and regular updates, so version 1.1 is better than 1.0.

We support it

Why Griffon as your mobile app development company: one named product lead runs your app from the first workshop to launch, every phase is scoped and priced before it starts, and the code, designs, developer accounts and store listings stay in your name. We also publish and support apps of our own, so we know what the months after launch look like.

Talk to an app strategist

Mobile app projects we’re proud of

View all app work ↗
RepTrack app screens: equipment picker, splash screen and workout history

01 / 03

RepTrack

A gym app for tracking workouts and progress. We rebuilt it in Flutter to replace a legacy build, re-engineering workout tracking, user history and performance logging for both platforms.

Health and fitness · Flutter rebuild, iOS and Android

Live on the App Store

See it on the App Store ↗

02 / 03

DiaryFi

Our own journaling app. Entries with photos, places and moods stay behind Face ID, sync with end-to-end encryption, and follow users between iPhone and Android.

Our own product · iOS and Android · subscriptions

On the App Store and Google Play

See it on the App Store ↗

03 / 03

Trip Amor

Our own AI travel planner. Amor AI turns one sentence, like five days in Lisbon, into a day-by-day plan, and the app keeps the whole trip in one place.

Our own product · AI trip planning · Android

Live on Google Play

See it on Google Play ↗

Two of these are our own products. We design, build, market and support them ourselves.

What’s included

Our custom mobile app development services

iOS app development

iPhone and iPad apps built to Apple’s guidelines, tested on real devices and prepared for App Store review.

More on iOS app development ↗

Android app development

Android apps for phones and tablets, tested across screen sizes and Android versions, and published on Google Play.

More on Android app development ↗

Cross-platform apps in Flutter and React Native

One codebase for iOS and Android when the product allows it, so you launch on both stores sooner and maintain one app instead of two.

More on cross-platform app development

App strategy and UX and UI design

Requirements, user flows, wireframes and a clickable prototype you can put in front of users before any production code.

More on mobile app design ↗

Backends, APIs and integrations

Accounts, databases, payments and connections to the CRM, booking, analytics and AI tools your business already runs on.

More on app backend development ↗

Launch, support and growth

Store submission, analytics, crash monitoring and updates, plus store listings and app install campaigns to bring in the first users.

More on app maintenance and support ↗
Get a free app proposal

How our mobile app development company takes your app from idea to launch

Every app follows the same five steps, run by one named product lead, with a progress update every week, a monthly report and a test build you can install on your own phone.

  1. 01
    Discovery
    Goals, users, competitors and constraints. We agree what the first version must do, and what can wait.
  2. 02
    Design
    User flows, wireframes and a clickable prototype, tested with real users before development starts. You approve it.
  3. 03
    Build
    Development in milestones, each scoped and priced in advance, with a build you can install and try.
  4. 04
    Test and launch
    Testing on real iPhones and Android devices, a beta release, then submission to the App Store and Google Play.
  5. 05
    Grow
    Analytics, crash reports and store reviews show what to fix and build next, release after release.
FAQ

Questions about mobile app development, answered

It depends on what the app has to do. The biggest cost drivers are the number of screens and features, whether users need accounts, payments or real-time data, how many platforms you launch on, the systems the app connects to, and the level of design polish. We price every app after a short discovery phase, milestone by milestone, so you approve each cost before the work starts.

It depends on scope. We set the timeline during discovery, split it into milestones with dates, and update you on progress every week, with a full report every month. Launching a focused first version and adding features after launch is usually the fastest way to the stores.

Cross-platform frameworks like Flutter and React Native run one codebase on iOS and Android, which usually means a faster launch and one app to maintain. Fully native code makes sense when the app leans heavily on device features or needs every bit of performance. We recommend one after discovery, based on your product.

Look for apps the team has launched and still supports, a clear process with priced milestones, and a contract that gives you the code, designs and developer accounts. Ask who will run your project day to day and how often you will see working builds. A team that also handles web, SEO and ads can help with the launch, not just the build.

Yes. Most clients arrive with an idea rather than a specification. Discovery turns it into requirements, user flows and a prototype you can test and price.

Yes. We review the code, the store listings and the user reviews, then recommend fixing what is there or rebuilding it. We have replaced legacy builds with new cross-platform apps that keep the features users already rely on.

You do. The source code, designs, developer accounts and store listings are yours, and we publish under your own App Store and Google Play accounts.

Yes. We prepare the store listings, screenshots and privacy details, handle submission and review, and stay on hand for the updates that follow.

We design around one core task and make it fast, keep onboarding short, ask for permissions only when they are needed, and use notifications sparingly. After launch, retention and crash data show where people drop off, and each release fixes the biggest leak first.

Usually, yes. We connect apps to payment providers such as Stripe, to CRMs such as HubSpot and Salesforce, and to booking and analytics tools through their APIs. If a system has no API, we tell you during discovery, before it affects the budget.

Yes. We build features such as AI trip and schedule planners, smart search, chat assistants and recommendations, grounded in your own data. Each one has to save the user time, or it does not make the cut.

Yes. When a browser is the better home for a product, we build web apps in React and Next.js with a Node.js backend. Some products get both, a web app and a mobile app sharing one backend.

We monitor crashes and performance, read the reviews, keep the app current with new iOS and Android releases, and plan the next features from how people actually use it.

Contact

Get a free app proposal

A 30-minute call. No deck, no pressure. Bring the site, the numbers and the goal, and leave with a plan and a price.

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