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How I Built 350 Personal Apps to Earn 7 Times My Salary

I've compiled 7 years of journey and know-how that led me to earn 2-7 times my salary through 350 apps. Now it's your turn to become the protagonist of this story.

(4.8) 258 reviews

2,094 learners

  • programmingzombie
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Android
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Monetization

Reviews from Early Learners

What you will gain after the course

  • App Monetization

  • App Marketing

  • A System for Prolific Creation

  • Boosting App Productivity

  • Boosting Productivity with AI

띠배너

I sleep only 4-5 hours a day and create 350 apps

I achieved 7 times my monthly salary in revenue - here's how I did it!


Steady side income from app development every month

You've probably thought about it at least once.

I also thought that if I just made a good app, the revenue would naturally follow.

However, reality was not easy. I barely maintained less than $0.5 in daily revenue for 8 months.

After much time and countless trials and errors, I learned that making money with an app requires a strategy guide.


After realizing that, my revenue started to consistently trend upward.

As the belief that "making money with apps is difficult" was shattered,

"I realize that if I just invest my time, I'll generate income proportional to that investment."

Recent Revenue Status Among Multiple Apps

Revenue graph for one of multiple accounts

So I worked at the company for 6 years while developing personal apps on the side.

In that process, I developed over 300 apps,

As the revenue from the app increased from 2 to 7 times my monthly salary

I have now left the company and am able to live comfortably while creating the services I want.

Han River Picnic on a Weekday 1

Han River Picnic on a Weekday 2

Renting out an entire kids cafe on a weekday

An article that nicely summarizes the related content through an interview

Now in my 7th year of app development,

During this time, I created many apps and went through a lot of trial and error.

In that process, there was also a lot of time wasted unnecessarily,

I hope others don't have to go through these trials and errors, so I'm sharing the know-how and strategies I've built up

I want to share it through a course.


"Why do you share such valuable information?"

Many people might be skeptical. "Why would you share information that makes money? Wouldn't it be more beneficial to keep it to yourself?"

I also thought the same way at first.

In fact, creating the course was a big challenge for me.

Sharing my know-how means increasing potential competitors. That's why I had many concerns about whether I should create the course and whether I should release it, from the course production stage until right before the launch.


But my blog

As I posted in https://soulduse.tistory.com/106, this path is lonely. There aren't many people monetizing through apps, but now I have a small hope that more people will walk the same path as me.

"Isn't it missing the core elements and lacking any real substance?"

This is proven by 161 reviews and a 5.0 rating. If this had been a course that merely deceived with poor content, it would never have received such an evaluation.

More importantly, what I want to convey is not simply a 'success formula'. This course is not about 'giving you fish' by recommending specific apps or categories. Such an approach can actually be dangerous. Because the moment a particular field becomes known for generating good revenue, countless competitors jump in and that market quickly becomes saturated. Instead, what I'm teaching you is 'how to fish'.

  • Methods for Discovering Profitable App Ideas

  • Effective Monetization Strategy


  • Practical Marketing Know-how

  • A System for Creating Sustainable Income

  • System for Maximizing Productivity Through Prolific App Development


This knowledge has true value that can be continuously utilized even as the market changes.

This course is not one that promises anyone can easily earn 10 million won per month.

These days, if you look around just a little, you'll see many articles and YouTube videos claiming "Anyone can easily earn 10 million won a month."

But isn't that strange?

The claim that anyone can easily make a lot of money literally means there is no moat of that magnitude.

Such items may be effective before sharing the content or in the early stages, but it doesn't take long before countless people quickly copy them, and the item that makes 10 million won per month becomes meaningless.


This course cannot guarantee that you will earn 1 million won per month.

However, what you can gain from this course is clear.

If you make the content of the lectures your own and consistently put them into practice, I believe you can start with $1 per day in revenue and gradually reach meaningful additional income, and eventually even surpass your monthly salary.

Part of the advertising revenue received from Google in October 2024

Part of the advertising revenue received from Google in February 2025

If you're hesitating about the course price

The course fee might feel burdensome. But think about it for a moment. If you divide this course fee by 365 days, it's about 1,000 won per day. What I can confidently say is that if you practice what you learn from this course, earning $1 per day is definitely achievable. In the end, even if you only earn $1 (about 1,400 won) per day, in one year you'll have earned far more than the course fee.

More importantly, it's about the value of time. I've accumulated this know-how through countless trials and errors over a long period of 7 years. Through this course, you can skip all the numerous struggles and inefficient processes I went through at once. Ultimately, this course will be an investment where you pay a cost to significantly save your precious time and energy.

It's time to break free from the illusion that "if you just build a great app, the revenue will naturally follow." The most important truth I've learned from developing countless apps is that no matter how perfectly you build an app with outstanding technical skills, you might not earn a single penny if you don't know how to monetize it.

I will share with you the countless concerns and trial-and-error experiences I've had while developing personal apps. Leverage your precious time and energy!

"Isn't that something you achieved because you're exceptional?"

I worked at companies for nearly 8 years, but I wasn't an exceptional developer. I hardly studied algorithms, and I would have struggled to even apply to companies with coding tests. Since I achieved this despite that, those with similar or better skills than mine should be able to achieve results even faster.

For 6 out of the past 7 years of my journey, I lived two lives simultaneously: as an office worker and as an independent app developer. My day didn't end even after leaving the office. After returning home and having a brief dinner, I would sit back down at my computer and dedicate myself to developing my personal apps.

I survived on just 4-5 hours of sleep per day, pouring all my passion into app development without any weekends off. You can see evidence of this journey in my blog and GitHub commit history. With the determination to write at least one more line of code every night, I've created over 350 apps.

Through countless trials and errors and failures, I was gradually able to establish my own framework for understanding which apps can survive in the market and how to efficiently generate revenue. Now, I've learned how to create stable income through a strategic and systematic approach, rather than simply creating many apps.


I will share with you the countless concerns and trial-and-error experiences I've had while developing personal apps


You'll learn this content

1. Important Mindset for Monetization

No matter how excellent your technical skills are or how well you build an app, monetizing it is a separate issue. Learn what mindset you need to approach this with.

2. Monetization Methods, Marketing Methods

If you've worked hard to create an app but don't know how to monetize it or do marketing, you might not earn a single penny. Learn how to monetize and market the app you've worked so hard to create.

3. Optimization Process for High-Volume App Development

How was I able to create 350 apps?

Learn about systems that will maximize your app productivity.

This course is at its lowest price right now.

I would like to especially emphasize that the current lecture price is at its lowest point.

1. Continuous Course Improvement

This course will not be a one-time content, but a continuously evolving and growing course. Based on feedback from students, I will reinforce necessary content and create new lecture videos to address frequently asked questions, which will be added to the course.

[25.03] - Updated with various new courses aligned with the AI era.

2. Reducing Potential Competitors

By sharing my know-how through this course, I may be increasing my potential competitors. This could ultimately affect my revenue. In the same vein, those who take this course will also face an increasing number of competitors over time.

Considering this reality, the course price will be gradually increased over time. This is not simply about increasing revenue, but also a strategic choice to protect the potential benefits of current students. Therefore, I can say that now is the optimal opportunity to take the course at the most reasonable cost.

  • [2025. 03 - 1st Price Increase] 385,000 => 429,000

⚠ We do not offer our own course discounts, but discount events held by Inflearn may apply. ⚠

Through a great deal of thought and effort, I've packed this with substantial content. Generating income beyond a company salary through solo app development, and furthermore, living the life you want. This journey that took me 7 years - you'll be able to achieve it in a shorter time.


Moreover, as the burden of development skills has decreased with the advancement of AI, I hope this course will help you in your new challenges.

Notes Before Enrollment

Learning Materials

  • Format of provided learning materials: Links, text, PDF, etc.

  • Volume and Capacity: Add learning materials for each chapter as needed

Prerequisites and Important Notes

  • Interest and Passion for Personal App Development


  • Experience in developing client apps such as Android and iOS

  • The copyright of this course belongs to Infinity Apps, and unauthorized distribution and reproduction are prohibited. The learning materials are also copyrighted and may not be used for purposes other than personal learning.

Frequently Asked Questions

Q. My development skills are lacking... Can I really make money with an app?

  • A. The biggest misconception about app monetization is that you need 'exceptional development skills'. What I realized while creating 350 apps is that 'strategy' is more important than 'technology' for successful app monetization.

Q. I know how to code, but I don't know what kind of app to build.

  • A. Don't worry! It's okay if you don't have an idea right now.

    I'll share with you in detail the many methods I use to discover ideas.

Q. Do you also teach app development methods and coding?

  • A. This course does not teach coding. There's a reason for that.

    Anyone can create an app, but not everyone can generate revenue from it.

    For example, shall we try?

    • App development knowledge can be learned for free with just a little searching on YouTube or the internet. And there are already many high-quality courses available.

    • However, the know-how to actually generate revenue with that app is not easily obtainable anywhere

    This course focuses solely on 'app monetization' and the 'productivity' needed to achieve it.

    • Monetization Strategy and Practical Know-How

    • From App Idea Discovery to Marketing

    • A strategy to maximize app development productivity and increase store visibility

    The real challenge isn't building the app, but generating revenue from it.

Q. Is the app mass production strategy still effective?

  • A. To get straight to the point, it is still possible with the appropriate account type selection.

    • For Android, personal developer accounts created after November 13, 2023, are subject to the restriction that "a minimum of 12 testers must conduct closed testing for 14 days" before personal developer accounts can release an app.

    • Therefore, it has become much more difficult than before to quickly release multiple apps with a personal account.

  • A. So what should I do?

    • You can open it as an organization account based on your business registration.

    • To create an organization account, you need to obtain a D-U-N-S Number and verify your Google Payments profile.

    • Once D-U-N-S verification is completed, you will be classified as an organization account and the above testing requirements will be waived.

    • This way, you can prepare for release immediately without the 12 testers and 14-day requirements.

Development Environment Setup by Programming Zombie (For Reference)

This content does not cover app development with the development environment below. This is the environment status of the service I'm currently operating, so please use it as a reference 😉

Client

  • Android

  • Language: Kotlin

  • Local DB Management: Room, SharedPreference


Server Deployment

  • GitHub Action

  • AWS Elastic Beanstalk

Server

  • Spring Boot

  • Language: Kotlin

  • DB Management: JPA

Production Environment

  • Server: AWS EC2

  • # Translation DB: AWS RDS --- **Note:** This appears to be a technical term/

  • Other services used: AWS Lambda, AWS SQS, AWS Route53, S3

Recommended for
these people

Who is this course right for?

  • Those who want to create additional income through side projects

  • I tried launching an app on my own but failed to monetize it

  • A developer who wants to start as a side hustle and grow it into a main career

  • For those who want to learn an efficient prolific production system

Need to know before starting?

  • App Development Experience or Skills

Hello
This is

5,715

Learners

317

Reviews

184

Answers

4.8

Rating

4

Courses

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Curriculum

All

63 lectures ∙ (6hr 21min)

Course Materials:

Lecture resources
Published: 
Last updated: 

Reviews

All

258 reviews

4.8

258 reviews

  • tkdrnjs09122659님의 프로필 이미지
    tkdrnjs09122659

    Reviews 1

    Average Rating 5.0

    5

    63% enrolled

    "If you just develop it well, you can make a lot of money with a personal app?" This stereotype, and the misconception that "if you just make a good app and release it, you'll hit the jackpot!" I broke all of that after taking this class. I realized that even the same app can make a world of difference in terms of revenue depending on how you market and advertise it. Now I've come to realize that 'selling apps' is just as important as developing apps. To be honest, when I first saw the tuition, I thought, "Isn't it a little expensive?" But after taking the whole class, I had just one thought: "This is a steal!" Precious insights and tips that you can't hear anywhere else, and realistic advice. It's not just a one-time class, but if you make it your own? I'm sure you'll be able to create 10 times, 100 times more value than the tuition. Are you considering taking the class? Don't hesitate, just trust and start. You'll think, "Oh, why didn't I take this sooner?"

    • jsween5723님의 프로필 이미지
      jsween5723

      Reviews 7

      Average Rating 5.0

      5

      100% enrolled

      I was able to gain a lot of insight. Thank you. If a more in-depth lecture is released for the parts that were omitted because they were too long for each field, I would be willing to repurchase it. If it's IT, it seems like a good lecture to watch regardless of the industry. I'm 80% done, so I'll go listen to the rest.

      • programmingzombie
        Instructor

        Thank you for your warm review! 😊 I'm glad that the lecture was helpful. As you said, this lecture focused on monetization strategies rather than the technical aspects of app development. I wanted to cover each topic in more depth, but some of the content had to be simplified because I focused on delivering key insights. Thank you for your interest in the advanced course in the future. We will continue to prepare content that will be of practical help to our students. I hope you will find the remaining 20% of the lectures helpful! 💪

    • namugocps3139님의 프로필 이미지
      namugocps3139

      Reviews 1

      Average Rating 5.0

      Edited

      5

      100% enrolled

      It was so intense that it was among the top 3 most useful videos I have ever heard. I will definitely watch the videos that Zombie makes on Inflearn in the future. In particular, I would like to see a video that shows how to make an app from start to finish, using a server and development tools, such as a diary app or a weather forecast app, and that allows you to check the code (even if the video is short, I would be very happy. Loyal customers are always sincere. Also, as Zombie said, failure is always a necessary process, and I don't think it's possible to make something perfect from the beginning, but even so, loyal customers are sincere just by making a video, taking failure into account.) Or, if you make a video of a project that starts with nothing and makes about 100,000 won by observing it from start to finish, like the popular "Surviving on Nothing," even people who don't know what to do will be inspired just by watching the video and following it. In the past, one of my friends didn't know how to use a PC room at all, but when I took him there and showed him in detail, he started spending all his days off at the PC room. And after that, when I saw my friend sharing the tips I didn't know about, I realized that it's important to make even the smallest things specific.

      • 억수님의 프로필 이미지
        억수

        Reviews 7

        Average Rating 4.0

        5

        100% enrolled

        I watched the entire lecture. First of all, thank you for the lecture. It's my habit to listen to the entire lecture and listen to the lecture again, but it was a lecture that made me think a lot. It was a lecture that gave insight to those who only looked at development to approach it in a more realistic way, and it was a lecture that personally told me in detail how to prepare and what process to prepare. From now on, I will review the lecture again and prepare. I hope to see many more lectures in the future. ^^

        • This is my first time teaching, so I was worried about whether I could convey the parts I wanted to convey well, but it feels like it was resolved in one go! Thank you so much. Haha. And I'm so glad that it was helpful to you! I hope you have great luck in your future app development journey. 👏👏

      • 404jsh5768님의 프로필 이미지
        404jsh5768

        Reviews 1

        Average Rating 5.0

        5

        100% enrolled

        I completed the course quickly as soon as I paid for it. I recently launched a personal app, so I had a lot of questions about marketing and operations, and I learned a lot of great insights. Thank you~

        • Wow! Thank you so much for giving me the full course! I'm so glad that the course helped you when you launched your own personal app. Marketing and operation are actually the most difficult parts. I sincerely hope that you successfully operate your app! If you have any additional questions or have any new concerns while applying it, please share them with me at any time. I hope we can think about it together and develop it. 🙌 Thank you again for the great feedback!

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