App Development Partner for US Companies

App Development Partner for US Companies

Your product is great. Your app should be too. We build apps for US companies – from branded apps for your service to apps that connect to your hardware and devices. And stay with you as your technical partner.

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Why US Teams Choose Us?

  • 9+ years in EV, IoT, fitness, and healthcare

    Since 2017, we've built apps for fitness makers, e-mobility companies, connected product brands, and digital health platforms. We know what your customers expect and what makes an app succeed in your industry. You don't pay for our learning curve.

  • We're building products for the US market

    Our work includes the console app for premium STEPR stair climbing machines; the Force USA training app for equipment sold in 30+ countries; and a branded app for Norsk Guardian, a US maker of lithium marine batteries.

  • We work around your schedule

    We're based in Europe and organize our days to overlap with US business hours. Calls, demos, and reviews happen during your working day, and development continues while your team is offline.

  • 20+ connected device models integrated

    Stair climbers, e-scooters, smart batteries, rowing machines, and more. When you launch new models or switch suppliers, your customers keep one app that simply works.

Products We've Built for the US Market

Android Console App for Stair-Climbing Machine

Android Console App for Stair-Climbing Machine

Fitness & Wellbeing

IoT & Connectivity

Embedded Android

USA

STEPR is a premium stair-climbing machine built for the US market. We started with a PoC on a sample unit, then built the console app that controls the machine and tracks workouts in real time, with a custom OTA update system outside Google Play. A companion mobile app covers models without a console.

View case study
Training App for All-in-One Trainers

Training App for All-in-One Trainers

Fitness & Wellbeing

Hardware Companion App

USA

Force USA is a leading manufacturer of functional training equipment that operates in over 30 countries across the globe. We created a companion fitness app that transforms their equipment into a digital training platform, helping users set goals, stick to personalized training plans, and track progress with guided workouts and video content.

View case study
Companion App for Lithium Marine Batteries

Companion App for Lithium Marine Batteries

IoT & Connectivity

BLE communication

USA

The Norsk Guardian app connects to lithium-ion batteries. We integrated the BLE communication and built a reliable connection that can perform even under severe marine conditions. The app monitors voltage, temperature, current charge, and sends warnings before critical circumstances arise.

View case study

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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How We Support US Teams

1

Partner mindset & co-creation

We don't just close tickets. We challenge assumptions, suggest better approaches, and align with you on measurable product goals.

2

Full intellectual property transfer

The code, designs, and documentation we create belong to you. No lock-in.

3

Fast start without recruiting overhead

Skip months of hiring. Our engineers join your project quickly, with minimal onboarding on your side.

4

Your product knowledge stays with us

We document architecture, decisions, and device behavior as we go. If an engineer changes, the knowledge stays with the team.

5

Stable connection for your customers

We host and configure your app's servers in the US, so it loads quickly and stays reliable from coast to coast.

6

We test on your actual hardware

Our QA engineers test real devices and firmware versions together with the developers who build the integration. We handle the shipping logistics with you.

7

L3 support for your L2 support

When a customer reports a problem, we quickly find whether it's the app, the device, or the connection and fix it. Your support team handles the customer; we handle the technical side.

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Who gets things done?

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Our Tech Stack

Frameworks

Programming Languages

Navigation

Networking & APIs

Backend & Data

State & Data Fetching

Payments & Monetization

External Devices / IoT & Connectivity

Maps & Location

Graphics, Video & Audio

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

What US Clients Say About Us

Jakob Hals

"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."

Todd Gilligan

"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!"

How can we help?

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CEO Image

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

How We Work With US Teams

Pre-Project

  • Discovery Stage

  • Planing

Agile Development

  • UX-Prototyping

  • Design

  • Development

  • QA & Testing

Transition

  • Maintenance

  • Handover

  • Next Iteration

We take all product delivery responsibility and offer you a full-cycle team (full-time engineers and part-time UI/UX designer, QA, and PM).

You need this if:

  • You're launching a new app and want one team accountable for the build
  • You're rebuilding a legacy app or modernizing an existing product
  • You have a specific product stream, module, or domain that needs its own dedicated team

Why US Companies Stay With Us

Let's build your next product together
  • 3.2 years average partnership

    Long-term collaboration is our standard, not the exception.

  • 3.7 years average engineer tenure

    A stable team and low churn mean the people who know your product stay on it.

  • We adapt to your business pace

    We plan team size around your budget cycle, scale down when you need a pause, and scale back up when you're ready to grow.

  • We develop your app with you

    New hardware models, suppliers, or firmware generations? We extend the same app and keep older devices working instead of starting over.

Let's build your next product together

FAQ

How do you handle the time difference with US teams?

We plan our working day to overlap with US business hours, so calls, demos, and reviews happen during your morning. While your team is offline, development continues, and you start each day with progress to review. Updates arrive in your Slack or project tracker, so you always know what's done, what's next, and where we need your input.

Who owns the code and intellectual property?

You do. We transfer full IP rights to everything we build for you, including source code, designs, and documentation. You keep admin access to your accounts, app store listings, and cloud services. If you ever decide to bring development in-house or work with another partner, your team gets everything it needs to keep the product going without us.

Can you start before our hardware is finalized?

Yes. Many connected products we work on start before the hardware is final. We begin with discovery and a proof of concept on a prototype or sample unit to test the riskiest parts first, like the device connection and data exchange. This way, problems surface early, when they're cheaper to fix. To build and test the full app, we'll need working devices, and we'll plan the shipping logistics with you.

Can you take over an app another team built?

Yes. We start with a technical review, available documents, and tell you honestly what needs fixing now and what can wait. Then we stabilize and modernize the app step by step without stopping your releases. You don't need the previous team's help to get started: we've taken over poorly documented apps before and rebuilt the missing knowledge as we went, documenting it for everyone who works on the product next.

How soon can you start my project?

Usually right after we agree on the scope. We begin with a kickoff to learn your product, goals, and current setup, then set up access and tools. Our team spends minimal time on onboarding and we document everything as we go. You can see first results within the first sprints.

How much does it cost to develop the app with you?

Our development unit usually consists of full-time developer(s) and part-time QA, UX/UI designer, and PM. The unit costs $10,000-$15,000 per month. Most projects take 4-8 months from discovery to deployment. So, the total is $40,000-$120,000.

But the price depends on the scope, the complexity of your product, and the team you need. Some clients need one engineer to join their existing team; others need a full team with design, QA, and project management. After a free consultation and discovery, you get a phased roadmap with a realistic budget for each phase, so you can decide before development starts.

Will we be able to communicate easily with your team?

Yes. Your team works directly with the engineers and project manager on your product, in English, without a chain of account managers in between. We use the tools you already use, whether that's Slack, Jira, or something else, and can join your standups and planning. You get regular updates and demos, so there are no surprises.

What does the contract look like?

We sign an NDA before you share any details, so you can talk openly about your product from the first call. The contract clearly defines scope, team, rates, and IP ownership, and we invoice in USD. You can scale the team up or down as your roadmap changes, without switching vendors.

How do you keep our data and product secure?

Access to your code, accounts, and customer data is limited to the people working on your product, and you keep admin rights to everything. When a team member changes or the project ends, we remove their access. Your data stays in your systems, and we work with it only as much as the project requires.

What happens after the app launches?

Launch is where most long-term work begins. We keep the app compatible with new iOS and Android versions, fix issues your customers report, and add features as your business grows.

If you need a pause in active development, we scale down to maintenance and scale back up when you're ready, with a team that already knows your product.

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Contact

Contact E-Mail

hello@stormotion.io