The book “How to Create Your Successful App” is designed for all entrepreneurs and startups who dream of launching a mobile application but don’t know where to start. More than a theoretical manual, it is a practical guide that teaches step by step how to transform an idea into a real, validated app, ready to compete in the market.

The book compiles knowledge accumulated over more than 20 years of experience developing mobile applications for startups, companies, and major brands. In the digital sector, where early mistakes can cost both time and money, having a resource like this app development guide is a huge advantage for those who want to start with confidence and a strategic vision.

Why this guide was written

The origin of the book lies in the personal experience of Roger Vilanou Vallès, co-founder of Doonamis. Throughout his career, he has accompanied hundreds of entrepreneurs in the process of creating an app from scratch, experiencing firsthand both the most common successes and failures.

From this experience, the guide was born: a resource aimed at spreading knowledge, helping entrepreneurs avoid costly mistakes, and offering a clearer, more direct path to success. Roger doesn’t just explain the “what”, but also the “how” and the “why” behind every key decision in app development.

What you’ll find in the book: from idea to published app

The content is structured into 20 chapters covering the entire lifecycle of a mobile application:

• How to validate your app idea without spending money.

• The differences between B2B and B2C apps and how to approach each.

• The legal aspects you must consider to protect your app (patents, IP, etc.).

• Which tools to use to design, test, and communicate your idea.

• Why accessibility and inclusivity are key and how to implement them.

• Which business model to choose (freemium, subscription, etc.).

• How to monetize with advertising and which platforms to use.

• Which mobile payment gateways to implement and how to ensure security.

• What type of app to develop (native, hybrid, or web) and cost estimates.

• How to structure and execute the development process step by step.

• Which privacy regulations you must comply with (e.g., GDPR) and how.

• Where and how to secure funding to launch or scale your app.

• How to promote your app: ASO, social media, influencers, and more.

• Which metrics (KPIs) to track in order to measure success and scale like a startup.

In short, it’s a roadmap for any entrepreneur to progress from idea conception to launch and subsequent growth.

Validate your idea without initial investment

One of the most frequent mistakes entrepreneurs make is investing too soon in development. The book explains how to verify whether there is a real market for your idea without spending money, using validation tools such as user interviews, online surveys, A/B testing, or landing pages that simulate the final product.

The goal is clear: don’t build an app nobody wants, but first confirm that the proposal solves a real need.

Choosing the right business model

Selecting the right business model is one of the most critical decisions for an app’s success. Roger details the main options—freemium, subscription, one-time purchase, or ads—and how to choose the most suitable one depending on the app type, target audience, and growth strategy.

He also explains how to adapt to different markets (e.g., B2B vs. B2C) and how to structure monetization from day one.

Protecting your app legally

The legal side is often one of the most overlooked aspects for digital entrepreneurs. The book provides a clear guide on how to protect the intellectual property of an application, the types of patents available, how to register your brand, and which regulations (like GDPR in Europe) must be met to avoid future legal issues.

This knowledge adds both peace of mind and professionalism to any project.

Prototyping and testing with key tools

Before investing in development, Roger explains how to use prototyping tools to design and test the idea. This allows entrepreneurs to present a prototype to users, investors, or partners without writing a single line of code.

The book also recommends accessible platforms for testing and provides advice on how to collect real feedback to improve the product before launch.

Monetization and funding strategies

Beyond choosing the right business model, it’s essential to plan how to monetize and finance the app at different project stages. The book covers everything from classic options like advertising and subscriptions to finding investors, crowdfunding, and startup accelerator programs.

This section is crucial, since many promising apps fail due to a lack of a clear financial strategy.

Marketing and growth metrics

An app’s success doesn’t end with its launch in app stores. To grow, it’s vital to gain visibility and measure results. Roger devotes an entire chapter to explaining digital marketing techniques specific to apps, such as ASO (App Store Optimization), social media campaigns, influencer collaborations, and user retention strategies.

He also includes a guide on key metrics (KPIs) to measure retention, customer acquisition cost, and scalability, helping entrepreneurs make data-driven decisions.

Who should read it

This book is aimed at a broad audience within the entrepreneurial and tech ecosystem:

• Entrepreneurs with an app idea but no technical experience.

• Startup founders looking to validate or scale their product.

• Developers who want to gain a business perspective beyond code.

• Marketers, consultants, and investors who need to understand the full process.

• Students, digital professionals, and mobile enthusiasts.

In short, anyone interested in turning an idea into a real app will find in this book a clear and practical guide.

About the author: Roger Vilanou, co-founder of Doonamis

Roger Vilanou Vallès is co-founder and Managing Director of Doonamis, Spain’s leading mobile app development company. With over 20 years of experience, he has worked with entrepreneurs, startups, and large brands, supporting projects from conception to market consolidation.

His strategic vision, combined with practical experience, has allowed him to identify what makes an app stand out and how to avoid the most common mistakes. With this book, he shares that knowledge with the aim of inspiring and guiding new digital entrepreneurs.

Where to find the book “How to Create Your Successful App”

The book is now available on Amazon, aimed both at those launching their first app and professionals looking to expand their knowledge of mobile strategy.

“How to Create Your Successful App” is, in short, the guide every digital entrepreneur should have on their bookshelf: a practical, accessible resource full of real examples to help turn ideas into success in the competitive mobile app world.