The Secure Flutter Handbook

The Secure Flutter Handbook is a clear, 100+ page, hands-on guide for mobile app developers who want to make their apps secure without getting lost in vague theory, overcomplicated jargon, or endless Googling.

Whether you're building your first Flutter app or maintaining one that’s already in the wild, this book will walk you through the most important security principles, how they apply in real-world apps, and exactly how to address them using modern Flutter tools and techniques.

It comes with:
✅ Access to a private GitHub repo full of practical code examples
✅ A growing library of bonus content and updates
✅ Access to a friendly, lightweight Slack community

What's In The Book

📘 11 practical chapters based on mobile app security principles

🛠️ The Toolbox: An actionable checklist that helps you audit your app based on all the chapters above.

🤖 Bonus Chapter on AI

Who This Book Is For

You’ll love this book if you are:

• A Flutter developer building mobile apps and want to understand how to secure them from day one.
• A beginner mobile developer who has heard of "OWASP" but found it overwhelming.
• A solo developer or freelancer responsible for both building and maintaining your app’s backend/frontend.
• Someone who prefers step-by-step guidance, practical examples, and gentle structure over dense textbooks or dry docs.

This book is intentionally written to feel like a supportive checklist, a friendly companion, and a practical reference; all in one.

What’s Included

• 📘 The eBook (PDF) – 100+ pages of beginner-friendly, field-tested guidance
• 🔐 A private GitHub repository with code snippets, secure patterns, and updates
• 💬 Access to a Slack community of fellow devs (optional, no noise)
• 🔁 Free updates — this isn’t a static book. I’ll add to it over time, and you’ll always get the latest version at no extra cost
• 💡 Lifetime access. Yours to reference, reuse, and revisit forever
• ✍🏽 Doodle-friendly format. Make notes, highlight sections, and treat it like a personal companion.

Why I Made This

Security always mattered to me but I never found a resource that taught it in a way that felt approachable.

I wanted more than a list of terms to Google later. I needed:

• A step-by-step reference
• Clear “what and how”
• A format that felt light and practical, not like another college textbook

This is that guide. And now it’s yours, too.

What People Are Saying

"Thank you so much for your dedication and hard work. You are an outstanding presenter and teacher. I am starting new Flutter apps and am switching my backend to Supabase. Your style and professionalism is incredible. Thank you! Karl" → YouTube subscriber

"Wow! I was really looking for something like this, am glad i came across this. You are such a wonderful teacher." → YouTube subscriber

"you are an excellent teacher" → YouTube subscriber

"Thanks for the amazing video on shared preferences.Can you make a similar type of videos on bloc" → YouTube subscriber

"You're really good at teaching. Thanks to you I actually enjoy back end." → YouTube subscriber

From BuyMeACoffee supporters → coff.ee/mobterest

License & Use

This handbook is for your personal use. One developer, one copy. If you found it helpful and want to share it with a friend, I’d really appreciate you pointing them to the Gumroad page instead.

This is a digital product, which means it’s non-refundable once downloaded. (It’s like a Git clone; once you’ve got it, you’ve got it.)

Thanks for respecting that!

A Note of Thanks

If you decide to support this work, thank you.

This handbook is built from years of experience, trial and error, and a desire to help developers, especially beginners, ship safer software with less guesswork.

If it gives you even one “aha!” moment, or helps you secure one app a little better, it’s done its job.