Starter Story · 2026-07-19

This Stupidly Simple App Makes $100K/Month

Michael, a 20-year-old NYU finance student rejected from his dream jobs, built Go Tall, a height prediction and habit app for teens ($35/year, $5/week, freemium), after spotting a similar app for sale on Acquire.com for ~$20K. He grew it with a TikTok format replying to comments with height predictions (10 TikToks/day for a month to find it), replicated the format on extra accounts and with cheap UGC creators DM'd at 50/day, then optimized the paywall and added paid ads on top of proven content: ~$3K -> $10K -> $30K (month 5) -> ~$100K/month, ~1M downloads.

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10 tactics

Go Tall · B2C · height prediction app for teens

Browse Acquire.com for small apps for sale, then build your own version

First sale 2 days after launch; now ~$100K/month

“I first saw this idea when I was looking on website, literally websites like acquire.com, cuz I was like, "I don't know any good ideas. I want to find a validated idea."”

Workedvalidationpositioning-niche

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

Reply to TikTok commenters' heights with videos predicting how tall they'll get

First viral format; 10-20 DMs a day asking for predictions

“People just want to give that information, and I assume like they wanted to get predicted, and so one of my first viral formats was just replying to those comments and predicting their height.”

Workedorganic-short-videovalidation

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

Post 10 TikToks a day for a month until one format works

Found a repeatable format; knew how many downloads 100K views brings

“It took about a month of just experimentation purely with content, making 10 TikToks every day.”

Workedorganic-short-videoanalytics-attribution

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

Copy your winning video format onto two new accounts and a friend's

All three accounts blew up, showing the format was teachable

“With the format, I replicated it myself on like two different accounts, and they both blew up. I had my girlfriend do it too, and like her account blew up.”

Workedorganic-short-video

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

DM 50 people a day asking them to make your proven, easy video

Creators worked cheaply; with founder content reached ~$3K/month

“So I just went on, DM'd like 50 people a day to be like, "Hey, would you want to make format, make this video? It's super easy." And so they were able to They were willing to do it for a very cheap price.”

Workedugc-creatorscreator-ops

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

Improve your paywall once videos bring steady installs

Revenue grew from ~$3K to ~$10K/month, alongside more scaling

“After I optimized my paywall and scaled a little more, it was about 10k a month.”

Workedpaywall

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

Try more video formats once the first one keeps working

~$30K/month by month five

“In month five, it was about 30k a month, as I explored even more formats.”

Workedorganic-short-videougc-creators

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

Put ad money behind the videos that already work organically

Scaled from ~$30K to over $100K/month

“And after 30k a month, it was simply just putting it on paid ads to scale to over 100.”

Workedpaid-social

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

Ask every question commenters volunteered, then show the answer after payment

91% of users reach the paywall despite the long onboarding

“as I'm predicting the height, the users kept on giving like more of their own information to the comment, because they want a more accurate height prediction. And so that just resulted in the onboarding being like super long.”

Workedonboardingpaywall

Starter Story · 2026-07-19

Go Tall · B2C · height prediction app for teens

Let the height prediction change weekly as people log sleep, meals and stretches

“The more you actually log it on the app, since like we can see how much you've been growing, it will actually give you like the most accurate height prediction.”

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Starter Story · 2026-07-19

Numbers mentioned

Subject	Metric	Value	Quote
Go Tall	revenue Average monthly revenue	USD 100K/month approximate	“last summer, I built an app called Go Tall, that now makes, on average, about 100k a month.”
Go Tall	price Yearly plan	USD 35/year	“We have a $35 yearly, a $5 weekly plan.”
Go Tall	price Weekly plan	USD 5/week	“We have a $35 yearly, a $5 weekly plan.”
Go Tall	downloads iOS App Store	700K downloads approximate	“I have about 700,000 downloads on the App Store”
Go Tall	downloads iOS + Android combined (Android: a couple hundred thousand)	1M downloads approximate	“a couple hundred thousand on Android as well, so it adds up to be about a million downloads overall”
Go Tall	time to milestone Launch to first sale	2 days	“after 2 days of launching it, I already had the first sale”
Similar height app listed for sale on Acquire.com	price Asking price of the similar app listed on Acquire.com	USD 20K/one-time approximate	“I saw an app that's pretty similar to this, for sale for around $20,000”
Go Tall	count Inbound TikTok DMs asking for a height prediction	10–20 DMs/day approximate	“I would have like 10, 20 DMs a day of people requesting their height to be predicted”
Go Tall	activity volume Founder-made TikToks during a month of format experimentation	10 TikToks/day approximate	“It took about a month of just experimentation purely with content, making 10 TikToks every day.”
Go Tall	activity volume Outbound DMs to recruit UGC creators	50 DMsper founder /day approximate	“So I just went on, DM'd like 50 people a day to be like, "Hey, would you want to make format, make this video? It's super easy."”
Go Tall	revenue With founder content plus a few UGC creators	USD 3,000/month approximate	“Basically, just myself, plus a few UGC creators, we were able to do maybe like 3k a month.”
Go Tall	revenue After paywall optimization and some more scaling	USD 10K/month approximate	“After I optimized my paywall and scaled a little more, it was about 10k a month.”
Go Tall	revenue	USD 30K/month approximate	“In month five, it was about 30k a month, as I explored even more formats.”
Go Tall	conversion rate Paywall show rate: share of onboarding starters who reach the paywall, despite a long onboarding	91% approximate	“this paywall has about like a 91% paywall show rate, despite being pretty long”
Go Tall	cost Singular MMP attribution cost	USD 0.03per install	“I use a Singular MMP for 3 cents per install”
aggregateCalorie tracker apps competing with Cal AI	revenue Guest's point that copycat apps in crowded categories still make money	USD 30K/month illustrative	“there's still calorie trackers doing 30k a month when you have Cal AI”