Mobile App Development
Developing a new product or modernising an existing one? We build mobile applications that are intuitive, reliable and aligned with your business goals. From new startup ventures to legacy enterprise apps, our team delivers native and cross-platform solutions built for long-term value and performance.
Built to launch, engineered to last
We help clients bring mobile-first products to life, with projects like standalone apps, companions to connected devices or extensions of broader digital ecosystems. Our designers & engineers work closely with your business and product teams to define the right architecture, select the optimal development approach and build solutions that scale sustainably.
At DO OK, we don’t just build what’s asked, we ask what should be built. Our mobile applications leverage user-friendly interfaces, third-party integrations and long-term OS compatibility that deliver strong user engagement and are easy to maintain, test and evolve. Our development process includes thorough QA, store submission support and post-launch improvements to keep your app performing across devices and updates.
Solutions
High-performance, secure mobile applications with the right tools, tailored for users, devices and business goals, with built-in scalability to fit your needs.
Native Mobile Apps
We build high-performance iOS and Android apps using platform-specific technologies for maximum control, security and access to device features. Native apps are ideal when performance, hardware integration or long-term maintainability is a priority, especially in regulated industries or highly interactive consumer-facing products.
Cross-Platform Apps
We develop mobile apps that run on both iOS and Android using a single codebase. This approach speeds up development and reduces costs without sacrificing design quality or functionality. Ideal for teams with limited resources or organisations seeking efficient product rollout across multiple platforms.
Wearables & IoT App Development
Our team builds mobile apps that pair with IoT devices, wearables and embedded systems to deliver responsive user experiences and intuitive device management. These apps sync over Bluetooth or Wi-Fi, enabling real-time data visualisation, control and connectivity across smart ecosystems.
APIs & Third-Party Integrations
At DO OK, we make sure your mobile app connects securely and reliably with third-party services such as payment processors, maps, CRMs or cloud platforms. We also build and document custom APIs to allow your product to scale, integrate and evolve within a larger digital ecosystem.
Mobile UX/UI Design
We design intuitive, accessible mobile interfaces that meet platform-specific guidelines while maintaining a consistent brand feel. Our user-first approach focuses on speed, clarity and engagement to help your app feel polished and purposeful on every screen and device.
JavaScript
TypeScript
Swift
Kotlin
Java
ReactNative
Objective-C
Flutter
Appium
Axios
Detox
Firebase
Eslint
Expo
Faker
Fastlane
Jest
NativeWind
Nx
Orval
Playwright
ReactNavigation
RxJS
Sentry
Why DO OK?
Cost-Aware Tech Decisions
We guide clients toward smart, sustainable choices, avoiding unnecessary complexity or hype-driven tools. By focusing on long-term costs, we help you invest in architecture and frameworks that match your product’s real-world needs and can be maintained without surprises down the line.
Fast, Responsible Delivery
Speed doesn’t have to mean shortcuts. We deliver quickly while keeping your product stable, scalable and maintainable. Our teams break down the scope into realistic phases and work in a way that supports iteration without accumulating technical debt or misalignment.
Clear Communication & Ownership
You’re never left guessing about any aspect of your project. We assign responsible leads, communicate clearly and resolve blockers early. Our developers take full ownership of their work, and our delivery team builds accountability and transparency into the process from day one.
End-to-End App Lifecycle Support
Our work doesn’t stop at delivery. We handle QA across devices and OS versions, verify app store guidelines are met and support rollout with updates and monitoring. Through deployment, maintenance and long-term stability, we stay involved to keep your app running smoothly and evolving with users.
Client Testimonials
Read more on:
Our collaboration with DO OK has been very good. We have had informal and efficient communication in both projects and the maintenance phase using Slack and regular status meetings. It is almost like collaborating with internal resources – they understand our needs right away.
Trond Enger
- Technical Manager, Vestfold Audio
Ready to build your app?
Have a mobile app idea or need to modernise your existing one? We’ll help you define the right approach, build a scalable solution and launch fast without compromising on quality or performance.
Frequently asked questions
How long does it take to develop a mobile app?
For most clients, we deliver a first version (typically an MVP) within three to six months. Timelines vary depending on product goals, design depth, platform requirements and integration needs. We start by clarifying scope and priorities, then structure development into realistic phases to help you move forward without unnecessary delays or guesswork.
Do you provide support, maintenance and app store submission help?
Yes, we stay involved after launch. Our team supports app store submission, resolves bugs, adapts to new OS versions and helps add features over time. We also provide structured maintenance plans for clients who want long-term technical continuity and someone accountable for app performance post-release.
What’s the difference between native and cross-platform mobile apps?
Native apps are built separately for iOS and Android using platform-specific languages. They offer the best performance and full access to device features. Cross-platform apps share much of the same code across both platforms, which speeds up delivery and reduces cost, especially useful when launch speed or budget is the priority.
How much does mobile app development cost?
Mobile development costs depend heavily on what you’re building. A simple MVP may cost up to a few thousands, while complex apps with multiple platforms, custom integrations and long-term support can go much higher. We work with clients to define scope clearly and make strategic trade-offs that fit your budget and business goals.
Do I own the app’s source code and intellectual property?
Yes. Once the project is complete and final payment is made, ownership of the code and related IP is transferred to you. We include transparent clauses in our contracts that protect your rights and make sure you retain full control over the product and its future development.
