Hey, I'm

profile
profile

Sunwoo

AI Solo Founder

project
project
project

Building from

map
map

Korea → SF

I build and launch AI-powered mobile apps as a solo founder. I share my metrics, failures, and lessons while growing toward $30K/mo.

My Projects

AI apps and experiments I'm building as a solo founder

Skills & Expertise

The tools I use to build and scale AI apps

profile pic
skils
skils

React Native

AWS Amplify

Expo

Mixpanel

Solo Founder

Building AI mobile apps & systems

2023 – Present

Solo Founder

Building AI mobile apps & systems

2023 – Present

Mobile Developer

Asleep

2023 - 2025

Mobile Developer

Asleep

2024 - 2025

Mobile Developer

Asleep

2023 - 2025

Startup Experience

Product dev, launch, iteration

2021 – 2022

Startup Experience

Product dev, launch, iteration

2021 – 2022

20+ side projects & prototypes

GreenLeaf Co

Ongoing

20+ side projects & prototypes

GreenLeaf Co

Ongoing

Tell Me About Your Next Creative Project

My Process

How I build, test, and launch as a solo founder

step1

Start with a Hypothesis

I begin every project by identifying a simple user pain point and validating it quickly with prototypes.

- 001

step1

Start with a Hypothesis

I begin every project by identifying a simple user pain point and validating it quickly with prototypes.

- 001

step2

Build Fast, Iterate Faster

I ship early versions in days, gather real user feedback, and improve constantly based on data.

- 002

step2

Build Fast, Iterate Faster

I ship early versions in days, gather real user feedback, and improve constantly based on data.

- 002

step3

Launch & Measure

Every release is tracked with Mixpanel, GA4, and user funnels to understand what truly drives retention and revenue.

- 003

step3

Launch & Measure

Every release is tracked with Mixpanel, GA4, and user funnels to understand what truly drives retention and revenue.

- 003

step4

Scale or Kill Quickly

If something resonates, I scale aggressively. If not, I shut it down and move to the next experiment fast.

- 004

step4

Scale or Kill Quickly

If something resonates, I scale aggressively. If not, I shut it down and move to the next experiment fast.

- 004

What I Build

Products and experiments I'm focused on

AI Mobile Apps

AI Mobile Apps

AI Mobile Apps

AI Tools & Micro-apps

AI Tools & Micro-apps

Content Auto Systems

Content Auto Systems

Prototyping & MVP

Prototyping & MVP

Product Design

UX Design

UI Design

Framer

Branding

Webflow

FAQ'S

Answering what people often ask me

What do you build?

I build AI-powered mobile apps, small tools, and automated content systems. Everything is shipped publicly as part of my solo founder journey.

Do you work with other founders?

Yes — I collaborate with builders, creators, and anyone exploring AI or mobile apps. DM me on X if you want to chat.

How do you choose what to build next?

I prioritize problems with clear user pain, fast iteration potential, and strong global appeal.

What is your current goal?

I’m scaling my AI apps toward $30K/month and preparing to move from Korea → SF while documenting the entire journey.

How often do you launch?

I aim to launch something every 1–2 weeks — either a new experiment or a major update to an existing app.

What do you build?

Do you work with other founders?

How do you choose what to build next?

What is your current goal?

How often do you launch?

Still have questions? Feel free to get in touch today!

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Sunwoo.build

Building AI apps as a solo founder.
Growing toward $30K/mo · Korea → SF

secondearthkr@gmail.com

© 2025 SecondEarth

All Rights Reserved

Hey, I'm

profile
profile

Sunwoo

AI Solo Founder

project
project
project

Building from

map
map

Korea → SF

I build and launch AI-powered mobile apps as a solo founder. I share my metrics, failures, and lessons while growing toward $30K/mo.

My Projects

AI apps and experiments I'm building as a solo founder

Skills & Expertise

The tools I use to build and scale AI apps

profile pic
skils
skils

React Native

AWS Amplify

Expo

Mixpanel

Solo Founder

Building AI mobile apps & systems

2023 – Present

Solo Founder

Building AI mobile apps & systems

2023 – Present

Mobile Developer

Asleep

2023 - 2025

Mobile Developer

Asleep

2024 - 2025

Mobile Developer

Asleep

2023 - 2025

Startup Experience

Product dev, launch, iteration

2021 – 2022

Startup Experience

Product dev, launch, iteration

2021 – 2022

20+ side projects & prototypes

GreenLeaf Co

Ongoing

20+ side projects & prototypes

GreenLeaf Co

Ongoing

Tell Me About Your Next Creative Project

My Process

How I build, test, and launch as a solo founder

step1

Start with a Hypothesis

I begin every project by identifying a simple user pain point and validating it quickly with prototypes.

- 001

step1

Start with a Hypothesis

I begin every project by identifying a simple user pain point and validating it quickly with prototypes.

- 001

step2

Build Fast, Iterate Faster

I ship early versions in days, gather real user feedback, and improve constantly based on data.

- 002

step2

Build Fast, Iterate Faster

I ship early versions in days, gather real user feedback, and improve constantly based on data.

- 002

step3

Launch & Measure

Every release is tracked with Mixpanel, GA4, and user funnels to understand what truly drives retention and revenue.

- 003

step3

Launch & Measure

Every release is tracked with Mixpanel, GA4, and user funnels to understand what truly drives retention and revenue.

- 003

step4

Scale or Kill Quickly

If something resonates, I scale aggressively. If not, I shut it down and move to the next experiment fast.

- 004

step4

Scale or Kill Quickly

If something resonates, I scale aggressively. If not, I shut it down and move to the next experiment fast.

- 004

What I Build

Products and experiments I'm focused on

AI Mobile Apps

AI Mobile Apps

AI Mobile Apps

AI Tools & Micro-apps

AI Tools & Micro-apps

Content Auto Systems

Content Auto Systems

Prototyping & MVP

Prototyping & MVP

Product Design

UX Design

UI Design

Framer

Branding

Webflow

FAQ'S

Answering what people often ask me

What do you build?

I build AI-powered mobile apps, small tools, and automated content systems. Everything is shipped publicly as part of my solo founder journey.

Do you work with other founders?

Yes — I collaborate with builders, creators, and anyone exploring AI or mobile apps. DM me on X if you want to chat.

How do you choose what to build next?

I prioritize problems with clear user pain, fast iteration potential, and strong global appeal.

What is your current goal?

I’m scaling my AI apps toward $30K/month and preparing to move from Korea → SF while documenting the entire journey.

How often do you launch?

I aim to launch something every 1–2 weeks — either a new experiment or a major update to an existing app.

What do you build?

Do you work with other founders?

How do you choose what to build next?

What is your current goal?

How often do you launch?

Still have questions? Feel free to get in touch today!

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Sunwoo.build

Building AI apps as a solo founder.
Growing toward $30K/mo · Korea → SF

secondearthkr@gmail.com

© 2025 SecondEarth

All Rights Reserved

Hey, I'm

profile
profile

Sunwoo

AI Solo Founder

project
project
project

Building from

map
map

Korea → SF

I build and launch AI-powered mobile apps as a solo founder. I share my metrics, failures, and lessons while growing toward $30K/mo.

My Projects

AI apps and experiments I'm building as a solo founder

Skills & Expertise

The tools I use to build and scale AI apps

profile pic
skils
skils

React Native

AWS Amplify

Expo

Mixpanel

Solo Founder

Building AI mobile apps & systems

2023 – Present

Solo Founder

Building AI mobile apps & systems

2023 – Present

Mobile Developer

Asleep

2023 - 2025

Mobile Developer

Asleep

2024 - 2025

Mobile Developer

Asleep

2023 - 2025

Startup Experience

Product dev, launch, iteration

2021 – 2022

Startup Experience

Product dev, launch, iteration

2021 – 2022

20+ side projects & prototypes

GreenLeaf Co

Ongoing

20+ side projects & prototypes

GreenLeaf Co

Ongoing

Tell Me About Your Next Creative Project

My Process

How I build, test, and launch as a solo founder

step1

Start with a Hypothesis

I begin every project by identifying a simple user pain point and validating it quickly with prototypes.

- 001

step1

Start with a Hypothesis

I begin every project by identifying a simple user pain point and validating it quickly with prototypes.

- 001

step2

Build Fast, Iterate Faster

I ship early versions in days, gather real user feedback, and improve constantly based on data.

- 002

step2

Build Fast, Iterate Faster

I ship early versions in days, gather real user feedback, and improve constantly based on data.

- 002

step3

Launch & Measure

Every release is tracked with Mixpanel, GA4, and user funnels to understand what truly drives retention and revenue.

- 003

step3

Launch & Measure

Every release is tracked with Mixpanel, GA4, and user funnels to understand what truly drives retention and revenue.

- 003

step4

Scale or Kill Quickly

If something resonates, I scale aggressively. If not, I shut it down and move to the next experiment fast.

- 004

step4

Scale or Kill Quickly

If something resonates, I scale aggressively. If not, I shut it down and move to the next experiment fast.

- 004

What I Build

Products and experiments I'm focused on

AI Mobile Apps

AI Mobile Apps

AI Mobile Apps

AI Tools & Micro-apps

AI Tools & Micro-apps

Content Auto Systems

Content Auto Systems

Prototyping & MVP

Prototyping & MVP

Product Design

UX Design

UI Design

Framer

Branding

Webflow

FAQ'S

Answering what people often ask me

What do you build?

I build AI-powered mobile apps, small tools, and automated content systems. Everything is shipped publicly as part of my solo founder journey.

Do you work with other founders?

Yes — I collaborate with builders, creators, and anyone exploring AI or mobile apps. DM me on X if you want to chat.

How do you choose what to build next?

I prioritize problems with clear user pain, fast iteration potential, and strong global appeal.

What is your current goal?

I’m scaling my AI apps toward $30K/month and preparing to move from Korea → SF while documenting the entire journey.

How often do you launch?

I aim to launch something every 1–2 weeks — either a new experiment or a major update to an existing app.

What do you build?

Do you work with other founders?

How do you choose what to build next?

What is your current goal?

How often do you launch?

Still have questions? Feel free to get in touch today!

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Let’s Connect

If you're building AI or thinking about moving to the US, say hi.

secondearthkr@gmail.com

reply with in 24 hrs

Preffer to Book a call ?

Sunwoo.build

Building AI apps as a solo founder.
Growing toward $30K/mo · Korea → SF

secondearthkr@gmail.com

© 2025 SecondEarth

All Rights Reserved