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Flutter development agency for iOS, Android, web and desktop apps

OakTree Apps builds Flutter apps for iOS, Android, web and desktop from one codebase. Our team has 13+ years of experience and has shipped apps in 15 industries, from health tracking to live camera tools.

Talk to a Flutter engineerSee Flutter projects
20
Projects delivered
6
Flutter experts
15
Industries served
13
Years of experience
One Flutter codebaseDart, shared logic and UIiOSAndroidTabletBrowserWindowsmacOS, LinuxMobileTabletWebDesktopWritten once, released to every platform.

Flutter apps we have shipped

From a medical camera app to a symptom tracker and a coaching platform. Every app below has a Flutter front end.

Healthcare / Flutter, UVC camera, on-device ML, AWS

FiBrEye: Endoscopy Detection App

A Flutter app that reads a USB endoscope camera, detects anatomy on the device, and draws labelled boxes over the live video.

  • Flutter app for AndroidLive USB camera feed with on-device detection.
  • Windows labelling toolRun the model on an image and correct the boxes by hand, offline.
  • AWS backendServerless API with encrypted DynamoDB tables and guest sign-in.
  • Admin dashboardSession and device overview for the team.
  • Flutter
  • Dart
  • PyTorch Lite
  • AWS Lambda
  • DynamoDB
  • Electron
  • React
Read the FiBrEye case study
Healthcare / Flutter, Node.js, Python, React

Corra: Symptom Tracker for Chronic Conditions

Corra helps people with chronic conditions log how they feel and what they do, then looks for patterns in their own data. We delivered the Flutter app within 3 months and also built the backend, the analysis pipeline and the admin panel.

  • Flutter app for iOS and AndroidLogs for symptoms, pain, medication, food, sleep, vitals and cycle, plus journals and appointments. Apple Health and Fitbit data sync in the background.
  • Node.js APIKoa and TypeScript on MySQL. Requests are authenticated with Firebase tokens and input is validated with Joi schemas.
  • Analysis pipelineA scheduled job sends each person's logs to a Python Lambda that fits a model for that one person. Nothing is suggested until they have 30 days of logs.
  • React admin panelManage users, offers and symptoms.
  • Flutter
  • Firebase
  • Koa
  • TypeScript
  • MySQL
  • AWS Lambda
  • Python
  • React
Read the Corra case study
LoveWork team building app built with Flutter for mobile and web
Team building

#lovework: Team Building App

LoveWork gives remote teams a short team-building practice every weekday morning, with comments and likes for feedback. They wanted a cost-effective replatform, so we suggested Flutter and delivered one solution for mobile and web.

  • Flutter
  • BLoC
  • Firebase
  • Cloud Functions
  • Google Apps Script
Read the case study
PGA Coach coaching app built with Flutter
Sport

PGA Coach: Online Coaching App

PGA wanted an app that helps certified coaches with booking, schedule management and student communication. One Flutter codebase ships both the coach app and the consumer app, and within 5 weeks of launch it had over 15K downloads on iOS.

  • Flutter
  • Stripe
  • Firebase
  • Stream chat
Read the case study
Wowd multimedia app built with Flutter
Entertainment

Wowd: Multimedia App

Wowd lets a fan pick an image or a video and ask a favourite artist to collaborate. Once the artist accepts, both sides work in a custom editor built into the app. We built it in Flutter within 2 months.

  • Flutter
  • Redux
  • Stripe
  • Apple Pay
  • Google Pay
Read the case study
See all our work

What we do with Flutter

Advice before the build, delivery during it, and support after launch.

Schedule a discovery meeting

  • Flutter consultation

    Not sure Flutter fits, or how to structure the app? We review your idea, budget and timeline, then tell you what to build with Flutter and what to build natively.

  • Cross-platform app development

    One team and one codebase for iOS and Android apps that behave the same on both. The same Flutter project also covers tablets, the web and desktop.

  • Flutter enterprise apps

    Scalable apps with role-based access, careful data handling and integrations into the systems your business already runs.

  • UI/UX design for Flutter

    We design the interface and the interaction flow before development starts, and review mockups with you first.

  • Third-party integrations

    Location and maps, payment gateways, chat, social sign-in, analytics and push notifications, wired into your Flutter app.

  • Support and maintenance

    Bug fixes, compatibility with new OS releases, performance work and new features after launch, under a maintenance contract.

  • Hardware, camera and on-device ML apps

    Flutter apps that talk to USB cameras and Bluetooth devices and run machine-learning models on the phone. FiBrEye reads a USB endoscope and labels anatomy in live video.

    Read the FiBrEye case study

Which platforms can one Flutter project cover?

Pick the platforms you need now and add the others later without starting over.

  • Mobile

    Scalable, secure cross-platform apps for Android and iOS.

  • Tablet

    Responsive, adaptive layouts that fit any screen size and resolution.

  • Web

    Web apps in Flutter, and web portals for mobile apps you already have.

  • Desktop

    Reliable desktop apps for Windows, Linux and macOS.

Why choose OakTree Apps for Flutter development?

  1. 01

    Experience

    Our Flutter engineers have delivered apps in finance, e-commerce, healthcare and more. You work with people who have met your kind of problem before.

  2. 02

    Test-driven development

    We write tests alongside features. That keeps quality high and keeps the build tied to your business goals and requirements.

  3. 03

    Purposeful animation

    We use animation to show users what is happening in the app, such as a state change or a move between screens.

  4. 04

    Dedicated support

    You get a team that stays reachable after launch, with support and maintenance for the apps we build.

  5. 05

    Security first

    We do not take development shortcuts that weaken security protocols, even when a deadline is tight.

How does a Flutter project run with us?

Four stages. Delivery runs in two-week sprints, so you always know what ships next.

  1. Requirement analysis

    1 to 2 weeks

    We discuss your vision, end goals and feature list in detail. The result is a specification document that works as the roadmap for the build.

  2. Design and development

    Mockups, then code

    If you already have mockups, development starts straight away. If not, we draw them, fold in your feedback, and build once you confirm the design.

  3. Test and launch

    2-week sprints

    At the end of every sprint you receive the agreed deliverables, with QA done inside the sprint. We repeat this until the specification is complete, then launch.

  4. Support and maintenance

    2-hour launch window

    We offer a 2-hour support window at launch. Maintenance after deployment follows the contract we sign.

Tech stack and integrations

Flutter and Dart on the front, and the services that usually sit behind a Flutter app.

Language and UI

  • Dart
  • Flutter
  • Provider
  • BLoC
  • Redux
  • Figma

Data and backend

  • Firebase
  • Node.js
  • MySQL
  • MongoDB
  • Redis
  • Elasticsearch
  • AWS Lambda
  • DynamoDB
  • Python

Payments

  • Stripe
  • Apple Pay
  • Google Pay

Hardware and ML

  • USB (UVC) cameras
  • PyTorch Lite
  • Bluetooth LE
  • Beacons

Integrations we build into Flutter apps

  • Audio and video live streaming
  • Chat integration
  • Social media integration
  • GPS and maps
  • Payment gateways
  • BLE and beacon devices
  • Apple Health and Fitbit sync
  • USB camera integration
  • On-device ML models
  • Digital automation tools

What does Flutter give your product?

Plan a Flutter build with us

  • Quick development

    Hot reload shows code changes instantly, which speeds up iteration and gets the app to users sooner.

  • Lower cost

    One codebase covers iOS and Android, so you pay for one build instead of two.

  • Near-native performance

    Flutter and Dart compile to native code, which keeps the interface smooth and responsive.

  • Stability

    A strong architecture and thorough testing mean fewer crashes and happier users.

  • Easier maintenance

    Organized, reusable code makes updates simpler and keeps long-term maintenance cost down.

What clients say

These guys know their stuff very well. We are highly impressed with the service of Oaktree Apps. They have kept us updated with every single detail throughout the development process and explained every single detail. Moreover the end result has really delivered what we looked for.

Portrait of Andrew KeadyAndrew KeadyCOO, Wellbility

Oaktree Apps helped us solve the problem of reaching a wider audience at a very limited price. They helped us develop a flutter app with cross-platform functionality which solved most of our problems. Impressed with the service we decided to upgrade the same app with them only.

Portrait of Jefferson StovallJefferson StovallVP, Beekeeper Group

Trusted by great brands

    Questions about Flutter development

    Is Flutter the right choice for app development?

    Flutter suits teams that want apps on both Android and iOS with a limited budget. One codebase gives you faster development, a native-like experience and lower development cost.

    Do you offer Flutter app development for startups?

    Yes. We build Flutter apps for startups, mid-sized companies and enterprises.

    What performance can I expect from a Flutter app?

    Flutter apps compile to native code, so they deliver a smooth, native-like experience on both platforms.

    Can you build an MVP with Flutter?

    Yes. Flutter is a good fit for an MVP because one codebase reaches both mobile platforms. We can also grow the MVP into the full product.

    Can Flutter be used for web development?

    Yes. Flutter builds web apps and works with standard web technologies such as HTML, JavaScript and CSS.

    Can you migrate my existing app to Flutter?

    Yes. We migrate existing native and cross-platform apps to Flutter, and we agree the scope in the specification phase.

    Can Flutter work with USB cameras and run machine learning on the device?

    Yes, with native Android code behind a Flutter plugin. In FiBrEye, the app reads a USB endoscope camera, shows the live feed in a Flutter widget, and runs a PyTorch Lite model on the phone to draw labelled boxes over the video.

    Read the FiBrEye case study
    Can you build a Flutter app that handles health data?

    Yes. We have built health apps such as Corra, a symptom tracker, and FiBrEye, an endoscopy detection app. On FiBrEye the backend encrypts data at rest and in transit, logs every API call and gives each function least-privilege access, on AWS services that are eligible for HIPAA workloads. Whether an app is HIPAA compliant also depends on agreements and processes outside the code, so we cover that in the specification phase.

    Read our HIPAA architecture guide
    How much does a custom Flutter app cost?

    Cost depends on the features, the technologies involved, the type of app, the team size and the length of the project. Tell us your requirements and we will send a personalized quote.

    Last updated 2 November 2026.

    Have an app in mind? Tell us what it needs to do.

    Share the platforms, the data and the deadline. A Flutter engineer will come back with what we would build and how we would run it.

    Schedule a discovery meetingEmail hello@oaktreeapps.com