Cross-Platform App Development Company

Cross-Platform App Development Company

From companion apps for hardware devices to fitness, healthcare, and e-mobility platforms – we help companies bring profitable products to market. Launch MVPs, speed up feature development, change OEM solutions to custom apps, and modernize legacy code with our team.

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Why Choose Our Cross-Platform App Development Service?

  • 8 years building cross-platform products

    We’ve developed 55+ cross-platform products that connect software with the real world. We work with complex cases: companion apps with protocol integration (Egret, Norsk Guardian), platform redesign (Caspar Health), MVP and feature delivery (Force USA), and branded apps instead of OEM/white-label solutions.

  • 3.2 years average client partnership across industries

    From cross-platform EV charging apps, like Deftpower with 1,000,000 charging points in Europe, to a global leader in innovative fitness equipment, Forse USA, that has already sold 500,000+ units. They trust us because we deliver across all platforms, take ownership of the technology, and invest in long-term partnerships.

  • We hire 0.3% of React Native candidates

    We attract top engineers who stay with us for about 3.7 years. You don’t have rotating contractors. You work with a constant, experienced team.

Our Recent Cross-Platform App Development Projects

Marine battery management app

Marine battery management app

IoT & Connectivity

USA

The Norsk Lithium is an American manufacturer of lithium-ion batteries. We built the Norsk Guardian app with a reliable BLE connection that works in harsh marine conditions. The app monitors voltage, temperature, current charge, and warns users about critical situations.

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White-label physical rehabilitation app

White-label physical rehabilitation app

Healthcare & Prevention

Germany

Caspar Health is a German digital rehab application. It offers video-based therapy from 60 therapists and doctors, secure patient-therapist chat (TalkJS), and progress reports. The users claim 97 percent of app satisfaction.

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E-scooter companion app

E-scooter companion app

EV & Mobility

Germany

Egret produces premium e-scooters. They needed an application that would support scooters with different BLE protocols. We rebuilt their React Native app with custom native modules. This way, we solved OTA update delays (reduced to 1 minute) and established stable software-hardware communication.

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Fitness tracking app

Fitness tracking app

Fitness & Wellbeing

Australia

Force USA is a leading manufacturer of fitness equipment that operates in over 30 countries. We created a cross-platform companion fitness app that transforms All-in-Trainer into a multifunctional training device. The app helps users set goals, stick to personalized training plans, and track progress with guided workouts and video content.

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B2B2C wellness app

B2B2C wellness app

Mental Health

Germany

Mindance provides more than 1,000 on-demand classes, weekly yoga and meditation classes, live coaching, and emergency hotlines. Employers have access to HR dashboards, corporate newsfeed, and online assessment of employee mental stress.

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White-label app for CPOs

White-label app for CPOs

EV & Mobility

Netherlands

Deftpower offers a white-label app with access to 1,000,000 charging points across Europe. Their clients can customize the app with their own branding, sign-up flows, and supported vehicle lists. We redesigned the app's UX, improved performance, and added animations.

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EV charging application

EV charging application

EV & Mobility

White-label app customization

Italy

Atlante operates 3,823 charging points across Italy, France, Spain, and Portugal. We customized their white-label myAtlante app with loyalty programs: promo code system and points-based rewards (Green Gems). For today, users redeemed promo codes 9,275+ times.

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App for child health management

App for child health management

Healthcare

Germany

The Humanoo Kids app helps parents manage their children's health and developmental milestones. It offers personalized health content, a doctor search, and integrates with the German insurance service.

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BLE-connected fitness app

BLE-connected fitness app

Fitness & Wellbeing

IoT & Connectivity

Germany

SportPlus manufactures connected fitness equipment. Our cross-platform mobile app development company built a BLE-based app that connects to fitness hardware models with 4 types of BLE protocols. To deal with this complexity, we designed a general protocol handler and introduced a CMS for customer workout content.

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App for caregivers

App for caregivers

Healthcare & Prevention

Germany

The Lifebonus app offers caregivers AI exercise tracking, stress-relief resources, and task management. The app improves the productivity of caregivers by 30% and reduces stress by 25%.

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Our Industries

Fitness

Fitness

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IoT & Connectivity

IoT & Connectivity

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EV & EMSP

EV & EMSP

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Healthcare & Mental Health

Healthcare & Mental Health

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Need a dev-partner

Who gets things done?

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Cross-Platform Technology Stack

Frameworks

Programming Languages

External Devices / IoT & Connectivity

Navigation

Graphics, Video & Audio

Backend & Data

Networking & APIs

State & Data Fetching

Payments & Monetization

Maps & Location

Forms & Validation

Internationalization

Analytics & Monitoring

Testing & QA

CI/CD & Delivery

AI / Machine Learning

AI Coding Assistants

Admin & CMS

React

React Native

Expo

Gatsby

Next.js

Hasura

NestJS

Testimonials

"Stormotion stood out because of their focus on Bluetooth-connected products. They weren't just app developers, they understood the unique challenges of building mobile app experience for hardware products. Their collaborative approach, technical expertise, and ability to quickly grasp the vision of the North Guardian app made it clear that they were the right fit."

"Stormotion has really delivered on their promises. They’ve been very transparent about their progress, flexible in reacting to changes, and solution-focused in overcoming challenges. If they didn’t know something, they would find out, which gave us great confidence in their ability to go the extra mile."

"I had meetings with 30 different agencies and the team at Stormotion gave me the most confidence to go forward. With them you feel like you've got a kind, knowledgable & conscientious team behind you. So I was 100% sure that they're going to be able to deliver our project!"

"We originally got in touch with Stormotion from our original app developer. And very soon we found real value in choosing Stormotion, because they previously had real valuable experience on the field – digital apps working in the realm of EV charging. So, it was really a no-brainer for us to to go with them."

"If you're thinking of going to Stormotion, you're going to have a very easy team to talk to, to communicate with, to understand what you want to do. They will tell you if you're barking up the wrong tree and are going to waste your time and money. I'd say "give it a go!" and I thoroughly recommend Stormotion."

"I highly recommend Stormotion as a service provider for app development. They're young, flexible, dynamic, creative and very fast. The cost of planning and implementation is also reasonable. As they use "pay as you go", have a good plan first – then the result also will be satisfactory."

"Given a tough budget and a lack of knowledge in our own engineering team, we quickly came to Stormotion. We had already worked together on previous projects, and I knew that, based on React Native, we could have one engineer responsible for it. That was just amazing because I could really focus on our customer side, knowing that the mobile application for the testers was in very good hands."

"Trust Stormotion. Work with them on your road map, on your technical debt. Also, expect feedback because the team is eager to do this. It's what I value and, I think, many startups value."

"The Stormotion team quickly became our team for everything Native app-related. It would be hard to name all the things that we built over the many years we worked together, but overall, I think we had a good partner who was able to adapt the way we worked, and the way they worked. So that we could ultimately build a product that had the quality that we wanted and with the speed that we wanted."

"Working with Stormotion was a blast! The Project Managers, and especially Alex, are always there for you when you need them to go the extra mile. And it's very easy to communicate with them. Whether it's something urgent or whether it's a bigger task, like building the structure of the architecture, I always felt like I was treated very well. Stormotion delivered a great app experience from day one."

Our Software Development Codex

1

Deliver solutions, not code.

Your value isn't in lines of code but in problems solved. Don't just execute requirements – understand your business challenge, question assumptions, and deliver outcomes that actually matter.

2

Your best effort means nothing if it doesn't work.

You can work late nights and write your best code ever, but if it breaks in production, nobody will see that effort – they'll only see the failure. Test your work before you ship it. Your hard work deserves to actually work.

3

Slow is smooth. Smooth is fast.

Prioritize clean code, solid architecture, and thoughtful decisions. True speed comes only after deep understanding. This principle applies especially to cross-platform app development services, where rushing leads to technical debt that slows everything down later.

4

Invented something? Great minds think alike.

It's obvious that rewriting a database from scratch makes no sense. Yet, too often we start coding without first checking if the problem has already been solved and shared.

5

Done is better than perfect. But some done is just version one.

Chasing perfection can waste time. It's okay to move on when something is good enough. But if we start building on top of weak work, it's worth going back and doing it right.

6

Duplicate. Abstract. Refine.

Code duplication is awful, but it is far cheaper than the wrong abstraction (Sandi Metz). The complexity of the abstraction has to reflect the complexity of the problem it solves.

7

Surface knowledge is surface value.

Using fancy technical words doesn't make you an expert. Real knowledge means understanding how things actually work and when to use them. Knowing just enough to sound smart is dangerous – it leads to bad decisions and overconfidence.

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CEO Image

Book a call with our Co-Founder, Roman, to explore your cross-platform project.

Cross-Platform App Development Process: Collaboration Models

Pre-Project

  • Discovery Stage

  • Planing

Agile Development

  • UX-Prototyping

  • Design

  • Development

  • QA & Testing

Transition

  • Maintenance

  • Handover

  • Next Iteration

Wearing both PM and CTO hats and need a tech partner you can trust? Our team offers clear milestones, transparent communication, and technical ownership to build apps that connect software with the real world, improve user ratings, and drive retention.

Depending on your needs, our collaboration can include:

  • Discovery & architecture planning – designing new apps, validating hardware protocols, selecting tech stack, planning sprints.
  • Branded app development – transforming OEM solutions into custom apps with full feature control and analytics.
  • Protocol integration – adding communication protocols of fitness equipment, EV charging stations, and consumer devices.
  • Code audit & modernization – auditing existing UX and codebases, fixing technical debt, rebuilding unstable apps, and improving app stability.

Our Excellence Pillars

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  • Technology consulting & co‑creation

    We identify potential issues, question assumptions, and give solutions. Our teams bring product thinking, technical roadmap, and architecture decisions to avoid tech debt. You get a partner who takes ownership, not just a team executing tickets.

  • 4 months to MVP: fast market entry

    We deliver MVPs in just 4 months through our expertise and smart tech stack choices. Our team adjusts timelines based on your specific needs, so you see results within months. You pitch products to investors and validate ideas with real users without burning budgets.

  • Hardware & wearable connectivity expertise

    We work with real-time data sync for connected hardware, OTA firmware updates, and integration of wearables and smart systems. Our team handles multi-protocol connectivity and protocol reverse engineering for undocumented hardware.

Contact us

Cross-Platform Mobile App Development Agency: FAQ

What is cross-platform app development?

Think of it this way: instead of hiring two teams to build your app twice ( for iPhone and Android), you build it once with a React Native framework. The app runs natively on both platforms from a single codebase.

Why does this matter? You're saving development time by about a third, maybe more. Plus, you don’t have to maintain two different apps that need to stay in sync. When you fix a bug, you fix it once. When you add a feature, you add it once.

Sometimes you need platform-specific integration, like Apple's HealthKit, or a unique Android feature. No problem. We integrate them via React Native libraries or native modules.

Will a cross-platform MVP scale as we grow?

Yes, but only when you build your app right from the beginning. The problem is when teams treat MVP as a dummy prototype. That's how you end up doing a complete rewrite when you hit 10,000 users. Our cross-platform mobile app development agency thinks about scale during the discovery phase. We help you choose the right tech stack, set up proper state management, and build the app in sprints.

How much does it cost for a company to develop a cross-platform app?

The cost depends on what app type you’re building. Our development unit (full-time developers + part-time QA, UX/UI designer, PM) costs about $10,000-$15,000 per month.

An MVP takes 3-4 months to build, so it costs between $30,000 and $60,000. But if you build the companion app for hardware devices, it can take 5-8 months to build and cost $50,000-$120,000. A complex platform with backend APIs, wearables, admin panels, and compliance requirements can take 8-12 months to develop and cost $120,000-$180,000.

How long does it take to build a cross-platform MVP?

The main task of MVP is to test your idea, not to launch every possible feature. A basic version with standard functionality usually takes 3-4 months to create. If you need a companion app for a hardware device, it can take 5-8 months to build. Contact us, and we will prepare the estimated timeline for your project.

How do you rescue a failing React Native app built by another company?

Our cross-platform mobile app development services start with a UX and technical discovery. Most apps have problems in both areas.

We do a combined audit: UX issues, code quality, performance bottlenecks, security gaps, and technical debt. You get a report that prioritizes fixes based on impact, not just severity. Then you decide: gradual refactoring or complete rebuild.

If the app has core problems, we improve it incrementally while keeping the app running. Nobody wants their app to go dark for three months during a rebuild.

Which is the best cross-platform app development company?

There isn't one "best" cross-platform app development company. It depends on what you expect from the development team.

If you need a companion app for the hardware, find a team that has built software for real devices before. If you need to modernize an existing app, you should find a team who've rescued apps, not just built new ones from scratch.

You can look at how long clients stick around, check if they have case studies in your industry, and ask about engineer turnover. The last aspect is important because you need a stable team for your project without the need to onboard new members each time.

Can cross-platform apps connect to Bluetooth devices reliably?

Yes. For a standard BLE connection, React Native has open-source libraries, like react-native-ble-plx. If you have a custom protocol or hardware with unclear documentation, we write and integrate native modules into your app.

But the main rule is to test the application with real hardware. Simulators won't show you the actual BLE connection problems until production.

What's the difference between React Native and native app development?

Native development means creating separate apps for iOS in Swift and Android in Java/Kotlin. React Native, on the other hand, allows you to create two high-quality apps for iOS and Android with a single codebase. React Native apps are easier to improve and maintain since you need to make changes only once.

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Contact E-Mail

hello@stormotion.io