Mobile App Development in Denver

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The Best Mobile App Developer in Denver

Any app developer can build an app. At Rootstrap, we believe in doing more. 

Our mission is to enact a new vision for mobile app development. Instead of just building to spec and pushing out something pretty, we believe in ROI-focused development. From the start of the app design and development process, our mission is to understand how a mobile app fits into your business and serves your larger objectives. We make every design and development decision with your overall business and target market in mind – because that’s how you build mobile apps that win over real users. 

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Our focus is to derisk your investment and deliver you a product that users will actually engage with. We've developed 250+ products for 500 founders with a combined revenue of 100m+. We battle-test every idea that we work on to make sure it can stand the test of time throughout market shifts and rends.

Mobile App Development in Denver

Rootstrap has been developing world-class mobile apps for nearly a decade, and in that time, we’ve taken on just about every kind of mobile app development project under the sun. We’ve built lean, single-function MVPs, hulking enterprise mobile apps, experimental AR and VR installations, and everything in between. Our client list features the likes of Tony Robbins, Snoop Dogg, and Epson. 

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In other words, mobile app development is what we do. Our team of app developers serves the Denver market, but we’re a global team of more than 70 app developers, product strategists, UI architects, and mobile experience fanatics that combine superlative technical chops with time-tested experience in business and product strategy. We work with clients of all sizes and have seen no-name solopreneurs become wildly successful – but we work with Fortune 100 companies as well, so if your app really takes off, we have the resources to scale with you.

More importantly, though, our mission is to help you build an app that does take off. We’ve overseen more than 250 successful product launches, and we’ve designed apps from the ground up for world-renowned names. We bring that experience to bear on every mobile app development project we take on. We do more than just develop apps for the sake of it – our focus is to ground the design and development process in the objectives and model of your larger business, creating a mobile app that furthers your business and generates real ROI.

In keeping with that mission, we are a staunchly Agile app developer. Agile development is a framework for building software that focuses on creating functional software as early as possible: instead of writing a comprehensive plan and building the product to spec, we focus on building a quick-and-dirty, functional program as fast as possible. The principles of Agile development are outlined in the Agile Manifesto, which is kind of like our bible:

  • Individuals and interactions over processes and tools
  • Working software over comprehensive documentation
  • Customer collaboration over contract negotiation
  • Responding to change over following a plan

We use Agile development because it works. The only way to build an app that succeeds on launch day is by involving real users early on, then revising the concept and the features based on their feedback. Agile helps us stay lean and build something people actually want to use, and time and time again, that’s proven to be an effective strategy.

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Mobile App Design in Denver

Before development, though, we need to focus on mobile app design – and that’s one of our specialties. In fact, we have a proprietary model for mobile app design called Roadmapping.

Roadmapping is Rootstrap’s flagship service offering. Roadmapping is largely how we made a name for ourselves, and it continues to lie at the core of our business philosophy. 

Roadmapping is a 2-4 week pre-development product workshop. It’s a small, low-risk engagement that aims to answer the big questions about your mobile app before we start development: who is this for? What benefit does it provide to users? How will it fare in the existing market? Roadmapping is a way to de-risk your investment: we aim to answer the question of if the app is worth building before we start writing code.

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Our app design process is different from most app developers in Denver. Most app development companies bake the discovery phase into their development process. We offer it as a standalone service because we’ve found it makes it more effective: it allows us to truly ask the question of whether the app will work, and if we find the answer is no, it still allows us the time to pivot.

But don’t take our word for it. The statistics on Roadmapping speak for themselves:

  • 18% of Roadmapping alumni raise over $250,000 in pre-product seed capital.
  • 8% of Roadmapping alumni raise more than $1,000,000 in capital.
  • Roadmapping alumni have a 2,600% better chance at funding than the average startup.
  • In all, Roadmapping alumni have raised $500 million in aggregate capital.

In other words, Roadmapping puts you in good company. Just hear what Tony Robbins had to say about our process:

“I reviewed the app and it’s totally spectacular. The approach that you took and the guidance you provided throughout the Rootstrap process has been phenomenal. I’m looking forward to continuing as partners!”
– Tony Robbins, CEO

We break the Roadmapping process into 4 key phases

Trust the Process


First things first – we have to understand what we’re building. In the initial phase, we work to completely define your app concept. Not just what it does, but how it helps its users –the key value proposition it provides.


With the concept in place, we move into sketching. In this phase, our goal is to explore every possible solution and architecture we can think of. No idea is too obvious or too anodyne – it’s all about moving through the solutions and features that won’t work so we can get to the one that works the best.

Now it’s time to bring the baby to life. With a detailed understanding of the concept and core value proposition in place, your app design team will craft a comprehensive, high-fidelity clickable prototype of your product. 

Refine & Prep

Finally, we’ll get you ready for development. Drawing on the work done in the previous three phases, your team will work with you to create a detailed product backlog: a comprehensive document that outlines every feature and functionality of the mobile app. We’ll then help you groom and prioritize this backlog, outlining exactly what you need to build for v1.0 and all subsequent builds of the product.


Full Stack Development

iOS, Android, Rails - You name it, we support it.

Help you flesh out your ideas and strategies

Design Thinking

We help clients with ideation, customer validation, launch plans, and beyond.

Strategy beyond the CMD line

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The Best Mobile App Developers in Denver

When you choose a mobile app development company for your project, you have to trust that organization. Choosing an app developer isn’t like buying from a vendor: you’re choosing someone that will help define the core of your product. You need to trust that team. 

Thankfully, ours is world-class. At Rootstrap, we have a team of nearly 100 people, including more than 60 full-stack engineers. Our company is home to UI designers, UX architects, business strategists, growth hackers, and product geniuses all dedicated to the success of our clients. We’re capable of serving enterprise-level organizations so we can grow as you do, and our distributed, global team means we can work when you do – and even when you’re off for the night.

Rootstrap - Mobile App Growth User Acquisition

As far as technical chops go, we can run with the best of them. We maintain a rigorous standard for code quality and hire only the best engineers, and our team is fluent in just about any language you can think of. Our specialties run the gamut from the traditional to the experimental, and we’re at home with a wide range of technologies:

  • Swift
  • C+
  • HTML5 Mobile App Development
  • HTML5 Web App Development
  • Sass
  • JavaScript
  • JQuery
  • Compass
  • iOS Development
  • Android Development
  • Augmented & Virtual Reality
  • Unity3D & Game Design
  • API Development

When you work with Rootstrap you’re doing more than just choosing a Denver app developer – you’re picking an experienced business partner that’s committed to your success beyond just building you a product. We truly believe that our success rests in our clients’ success, and we’ll work with you to design, develop, and launch a mobile app that generates real growth.

Explore Our Case Studies

Tony Robbins


Rootstrap helped Tony Robbins digitize his coaching empire  

Rootstrap helped MasterClass build new features and double 

their revenue


Globalization Partners

Rootstrap Helped Globalization Partners achieve a 95% client satisfaction rate with mission critical software

Mobile App Development for iOS in Denver

Now, the immortal question:

Should I make Android or iOS apps?

We’d recommend developing for both the Android and iOS platform – but sometimes, resources force you to prioritize one over the other. There are great arguments for both, and ultimately it depends on the specifics of your mobile app. So why would you build an iOS app?

Looking purely at the numbers, iOS apps generate more global revenue than Android apps. The App Store generated roughly $40 billion in revenue in 2017, double the Google Play store’s $20 billion. It’s also significant that the App Store saw only 28 billion downloads, while Google Play saw 64 billion. This means, effectively, that the App Store generated twice as much revenue with half as many downloads. Pound for pound, iOS app downloads are worth more. 

Rootstrap - Mobile App Roadmapping

This is likely due to geographic distribution. Apple dominates in mature, developed consumer markets like the US, North America, and Europe. Consumers in these markets tend to have more money to spend on mobile apps, which can often mean iOS apps see higher revenue. And if you want to develop your mobile app in Denver, that’s an important thing to keep in mind.

Still, iOS development comes with drawbacks. The App Store isn’t a very flexible platform. They require a waiting period of up to two weeks to publish new apps and updates to your app, which slows down the iterative development process. Furthermore, Apple retains full control over what goes on the App Store. While it’s extremely rare, it’s possible to have your app rejected by Apple outright after development.

Still, iOS development is a lucrative enterprise, especially for mobile apps targeting the Denver and US markets. Thankfully, the engineers in Rootstrap are experts at native iOS app development.

Mobile App Development for Android in Denver

Apple isn’t everything, though. Android app development is still a worthwhile pursuit that comes with its own list of unique benefits. 

For one, the Google Play store is much more flexible for app developers. Google Play allows changes and updates to go live in just 2 hours, which means we can improve the app based on user feedback in real time. For new startups trying to perfect their mobile app, this is a big advantage. User acquisition cost is also lower on Android, which means it’s faster and cheaper to iterate your product and build a user base.

Rootstrap - Mobile App Staff Augmentation

Android is also better positioned for growth on a global scale. While Apple wins in North America and Europe, Android has a stronger position in Latin America, China, and many other emerging markets. That means Android may well see stronger growth over the next 5 to 10 years. Developing an Android app positions you to capitalize on that growth.

And hey – the App Store may make more money, but whatever anyone says, $20 billion and 64 billion downloads is still a big, juicy market.

Let’s Build Your Mobile App Together

Ultimately, though, there are no right answers here. The best platform to use depends – just like everything else – on the specifics of your app concept, target market, and business objectives. That’s why we make it our business to be experts in all of these fields, giving you a comprehensive partner in both the strategy, design, and development of your app. 

So drop us a line. We’re always happy to hear from potential new clients, and we take all comers – you don’t need a fleshed-out plan. Even some of the biggest companies in the world started as chicken scratch on the back of an envelope. 

Give us a call. We’ll set up a time to talk about your idea and see if there’s a mutual fit for building the product. 

Let’s build something great together. 

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