HOW A SIMPLE APP REACHED $100K/MONTH
YOUTUBE SUMMARY : STARTER STORY
CHAPTER INDEX
$100K/MONTH FROM A HEIGHT APP
A SIMPLE IDEA BECAME A SERIOUS BUSINESS
Michael is a 20-year-old college student who built Go Tall, a height prediction and self-improvement app.
The result:
• ~1 million total downloads
• ~$100K average monthly revenue
• iOS + Android
• Subscription business
The surprising lesson: the idea did not need to look sophisticated to become valuable.
THE BUSINESS IN ONE PAGE
WHAT GO TALL ACTUALLY DOES
Go Tall attracts teenagers with one powerful question:
“How tall will I become?”
Users enter information about height, parents, puberty and habits. The app generates a prediction, then expands into sleep, nutrition, stretching and growth tracking.
Prediction gets the user in. Ongoing habits create the subscription.
1. FIND THE IDEA
DO NOT START BY TRYING TO INVENT SOMETHING NEW
HE LOOKED FOR PROVEN IDEAS
VALIDATION BEFORE ORIGINALITY
Michael did not begin with a breakthrough invention.
He searched marketplaces such as Acquire.com looking for apps that were already working.
He found a similar height-related app listed for around $20,000.
That mattered because somebody had already demonstrated that this category could become a real business.
THEN HE CONNECTED IT TO HIMSELF
PERSONAL EXPERIENCE STRENGTHENED THE SIGNAL
Michael remembered that when he was around 13, he had searched Google for things such as height calculators.
That gave him another signal:
1. The problem already existed.
2. He personally understood the curiosity.
3. Young people were actively searching for answers.
The idea was simple, but the desire behind it was real.
EXISTING COMPETITION WAS A GOOD SIGN
SOMEONE ELSE BUILDING IT DOES NOT KILL THE IDEA
Many founders abandon an idea when they discover competitors.
Michael saw competition differently.
If calorie trackers can still make money while huge calorie apps already exist, then a category is not automatically finished.
The opportunity can come from:
• Better positioning
• Better marketing
• Better onboarding
• A different audience
2. VALIDATE REAL DEMAND
LOOK FOR EVIDENCE THAT PEOPLE ACTUALLY CARE
THE FIRST SALE CAME IN TWO DAYS
SMALL SIGNALS CAN BE POWERFUL
Two days after launching, Go Tall already made its first sale.
Michael had not generated huge traffic yet.
That made the signal more important.
If a small number of viewers can already produce a paying customer, demand may be stronger than the traffic numbers suggest.
Before chasing scale, first prove that somebody is willing to pay.
TIKTOK COMMENTS BECAME RESEARCH
THE MARKET WAS ALREADY EXPLAINING THE PROBLEM
Michael studied TikTok videos about height.
The comments were full of messages such as:
“I’m 15 and six feet tall.”
“My mom is this tall.”
“My dad is this tall.”
“How tall will I become?”
People were voluntarily sharing personal information because they wanted an answer.
That behavior revealed real demand.
DMS WERE AN EVEN STRONGER SIGNAL
PEOPLE CARED ENOUGH TO ASK DIRECTLY
Michael began receiving roughly 10–20 DMs per day asking for height predictions.
That is stronger than passive engagement.
A like says:
“That was interesting.”
A DM says:
“Please solve this for me.”
One useful startup test is therefore simple:
Are people actively asking you for the outcome your product provides?
CARE BEFORE VIRALITY
DEMAND DOES NOT NEED MILLIONS OF VIEWS
One of the biggest lessons from Go Tall is that an idea does not need to go viral before you know it has potential.
People simply need to care deeply enough.
Watch for:
1. Questions
2. Repeated comments
3. DMs
4. Requests
5. Early purchases
Strong intent from 100 people can be more valuable than weak attention from 100,000.
3. FIND THE HUMAN NEED
THE APP WORKS BECAUSE THE DESIRE IS DEEPER THAN HEIGHT
HEIGHT IS NOT THE REAL PRODUCT
THE DEEPER DESIRE CREATES WILLINGNESS TO PAY
The functional product is a height prediction.
The emotional product can be much bigger.
Users may connect height with:
• Confidence
• Appearance
• Social status
• Attraction
• Belonging
• Self-improvement
The stronger the emotional meaning behind an outcome, the more attention people may give to solving it.
USE HUMAN NEEDS AS AN IDEA FILTER
MICHAEL REFERENCED MASLOW'S HIERARCHY
Michael evaluates ideas by asking whether they connect to fundamental human needs.
For Go Tall, he saw connections to:
1. Esteem — wanting confidence or respect.
2. Love & belonging — believing appearance may affect attraction or relationships.
The principle: products become more compelling when they connect to desires people already carry.
LOOK WHERE PAIN IS PERSISTENT
HEALTH, WEALTH AND RELATIONSHIPS
The interview repeatedly points toward categories where people already experience strong problems.
Examples:
A. Health — body, sleep, nutrition, fitness.
B. Wealth — income, career, money.
C. Relationships — dating, family, belonging.
D. Self-improvement — confidence, appearance, performance.
You are looking for recurring desire, not temporary curiosity.
4. CRACK DISTRIBUTION FIRST
THE REAL ADVANTAGE WAS MARKETING
HE MADE 10 TIKTOKS EVERY DAY
VOLUME CREATED LEARNING
Michael spent roughly one month experimenting heavily with content.
His approach was simple:
Create around 10 TikToks every day.
The goal was not perfection.
The goal was pattern discovery.
Every post created another test:
• Hook
• Format
• Topic
• Comment angle
• Conversion
High output compressed the learning cycle.
THE WINNING FORMAT WAS SIMPLE
REPLY TO PEOPLE ASKING ABOUT HEIGHT
One of Michael's first viral formats came directly from the comments.
Someone shared their age, height and parents' heights.
Michael replied with a video predicting their future height.
This worked because the content already contained:
1. A real person
2. A question
3. Suspense
4. A personalized answer
5. A natural connection to the app
ONE CHANNEL MADE ATTRIBUTION EASY
LEARN THE CONVERSION MATH
At the beginning, Michael had one main format and one main distribution channel.
That simplicity made attribution easier.
He could estimate:
100K views → X downloads → X trials → X customers → X revenue.
Once you understand this chain, marketing becomes less mysterious.
You can start calculating how much attention is worth buying.
PROVE THE FORMAT CAN BE REPEATED
A VIRAL POST IS NOT YET A SYSTEM
Michael tested the format on multiple accounts.
His own additional accounts worked.
His girlfriend tried it and her account worked too.
This was important.
If only the founder can make the content succeed, scaling is difficult.
If other people can reproduce the result, you may have discovered a repeatable distribution system.
TURN THE FORMAT INTO UGC
MOVE FROM FOUNDER-LED TO CREATOR-LED GROWTH
Once the format was proven, Michael began contacting creators.
He says he DM'd around 50 people per day.
The pitch was simple:
“Would you make this type of video? It is easy.”
Because the format was straightforward, creators could produce it cheaply.
Now content production was no longer limited by Michael's personal time.
THE GROWTH LADDER
ORGANIC FIRST, PAID LATER
The revenue progression followed a clear sequence:
1. Founder + small UGC team → ~$3K/month
2. Better paywall + more scale → ~$10K/month
3. More content formats → ~$30K/month around month five
4. Proven creatives + paid advertising → $100K+/month
He scaled what was already working instead of using ads to rescue weak demand.
ORGANIC CONTENT BECAME AD CREATIVE
USE THE MARKET TO SELECT THE WINNERS
The powerful part of this playbook is the sequence.
Organic content becomes a testing laboratory.
Post many ideas.
Observe what performs.
Repeat the winners.
Teach creators the format.
Then put advertising budget behind proven creatives.
Instead of guessing which ads might work, organic performance helps identify them first.
5. BUILD THE MONETIZATION LOOP
ATTENTION ALONE DOES NOT CREATE THE BUSINESS
THE PREDICTION CREATES CURIOSITY
A STRONG REASON TO COMPLETE ONBOARDING
The app makes users work toward an answer they strongly want:
“How tall will I become?”
During onboarding, users keep providing information because every additional answer feels like it could improve prediction accuracy.
The interview mentions a paywall show rate of around 91%, even though the onboarding is relatively long.
Curiosity pulls users forward.
LONG ONBOARDING CAN STILL WORK
EVERY QUESTION MUST FEEL USEFUL
Long onboarding is not automatically bad.
Go Tall asks questions about areas such as:
• Current height
• Parents' heights
• Puberty
• Growth information
• Other personal factors
The key is perceived relevance.
Users tolerate additional steps when they believe each answer increases the quality of the result they are about to receive.
THE ANSWER SITS BEHIND THE PAYWALL
MONETIZE THE MOMENT OF HIGHEST INTENT
Users complete the prediction process, but the final predicted height requires a subscription.
The interview describes pricing around:
• $35/year
• $5/week
Free functionality remains available, but the main curiosity—the prediction—is monetized.
The paywall appears exactly when the user's desire to know the answer is strongest.
PREDICTION GETS THEM IN
HABITS GIVE THEM A REASON TO STAY
A one-time prediction would create weak retention.
Go Tall extends the product into ongoing behavior:
• Sleep logging
• Meal scanning
• Stretching
• Growth tracking
• Habit optimization
As users log more information over time, their estimated height can change.
That turns a one-time curiosity product into a recurring subscription experience.
ADD SUBSTANCE BEHIND THE HOOK
THE APP EVOLVED BEYOND A NOVELTY
Michael explains that the first version was simpler.
Later, the app incorporated data and research references, including CDC growth information and research linked to some questions.
This is an important product sequence:
1. Start with the compelling hook.
2. Validate demand.
3. Improve usefulness.
4. Deepen the product after people care.
6. KEEP THE TECH SIMPLE
THE BUSINESS DID NOT REQUIRE EXOTIC TECHNOLOGY
THE TECH STACK
SIMPLE INFRASTRUCTURE BEHIND THE BUSINESS
Michael describes a relatively lean stack:
1. Expo — build for iOS and Android.
2. Superwall — paywall management.
3. Adapty — subscription-related infrastructure and advanced payouts.
4. Singular — mobile measurement and attribution.
The advantage was not unusual technology.
The advantage was demand + distribution + monetization.
DO NOT CONFUSE COMPLEXITY WITH VALUE
A SIMPLE APP CAN BECOME A LARGE BUSINESS
The height prediction concept initially sounded almost too simple to be a serious company.
Yet Go Tall reached roughly one million total downloads and around $100K/month according to Michael.
The lesson is useful for builders:
Customers do not reward technical complexity by itself.
They reward products that solve something they care about.
7. CLIMB CRINGE MOUNTAIN
THE FOUNDER LESSON BEHIND THE NUMBERS
MICHAEL STARTED AFTER REJECTION
FAILURE REDIRECTED HIS ATTENTION
Michael studied finance at NYU and was recruiting for prestigious jobs.
He says he was rejected from many of the jobs he wanted.
Instead of stopping, he returned to something he already knew: building apps.
His weakness was marketing.
So his goal became bigger than one app:
Even if the project failed, he wanted to leave with marketing skills.
THE APP WAS NOT PRESTIGIOUS
THAT BECAME AN ADVANTAGE
Michael came from an environment where success often meant prestigious corporate jobs or ambitious VC-backed startups.
A height prediction app did not create the same social status.
People could easily dismiss it.
He built it anyway.
Sometimes ignored markets exist precisely because smart people think the opportunity looks too small, strange or embarrassing.
REMOVE EGO FROM THE EXPERIMENT
DO THE WORK OTHER PEOPLE AVOID
Michael's advice is to let go of the need to look impressive.
Make the strange app.
Post the awkward TikTok.
Reply to comments.
Send the DMs.
Test the idea people laugh at.
The goal is not to look like a successful founder before success exists.
The goal is to discover what customers actually respond to.
THE $100K APP PLAYBOOK
THE COMPLETE SYSTEM
1. Find an existing category with proven spending.
2. Identify a problem people deeply care about.
3. Validate using comments, DMs and early sales.
4. Create content manually at high volume.
5. Find one repeatable format.
6. Give it to creators.
7. Optimize conversion.
8. Scale proven content with paid ads.
THE REAL FOUNDER ADVANTAGE
NOTICE WHAT EVERYONE ELSE IGNORES
The opportunity was visible to everyone.
Height videos already existed.
People were already commenting.
Competitors already existed.
Teenagers were already searching for answers.
Michael connected those signals and acted.
Great ideas are not always hidden.
Sometimes the advantage is simply noticing obvious demand, moving quickly and taking it seriously.
PEOPLE JUST NEED TO CARE
THE CENTRAL LESSON
A startup does not need millions of views, complicated technology or an idea nobody has seen before.
It needs a group of people who care enough to act.
Look for the evidence:
They ask.
They comment.
They DM.
They search.
They pay.
They return.
When those signals appear, do not dismiss the opportunity because the idea looks too simple.