Starter Story · 2026-05-10

I Built a $20K/Month App in 83 Days

Brian Shin and his girlfriend built Once, a disposable-camera app for weddings, parties and events, priced by guest count. It launched in December 2025 and hit $20K/month in 83 days, with 10-12K weekly active users. The episode covers how they validated before coding: a scrappy web app tested at a Halloween party, outreach to friends across X, LinkedIn and Instagram, and cold DMs to ~250 people found through Instagram hashtags. They set a 'commitment metric' of 10 real events booked before writing app code.

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5 tactics

Once · B2C · disposable camera app for events

Don't write app code until 10 hosts commit to using it at a real, dated event

Got 12 events booked in one month, built the app, and hit $20K/month 83 days after launch

“Step one would be to define your commitment metric.”

Workedvalidation

Starter Story · 2026-05-10

Once · B2C · disposable camera app for events

Scroll your X, LinkedIn and Instagram friend lists and ask anyone with an upcoming event

4 friends agreed to try it: a Halloween party, birthday, wedding and networking event

“I open up three different tabs. I have my X open, I have my LinkedIn open, and I have my Instagram or Facebook open up. I have my friends list. I just go through every single one of them and see who might be a good fit.”

Workedvalidationword-of-mouth

Starter Story · 2026-05-10

Once · B2C · disposable camera app for events

Find event hosts through Instagram hashtags like #wedding and send each a 2-3 sentence DM

~250 messages got ~15 replies and ~12 events booked in one month

“I searched on Instagram like hashtag wedding, hashtag birthday party, and across platform, we had around 250 to 300 people listed out. I wrote down a very simple, cold-message type of two to three sentences max that could grab their attention and try to pitch our idea so that they can try it out.”

Workedoutbound-salesvalidation

Starter Story · 2026-05-10

Once · B2C · disposable camera app for events

Build a rough web version in 1-2 weeks and test it at a friend's party

Broke many times but proved guests love a shared disposable-camera album; then rebuilt from scratch

“We had a Halloween party hosted by my friend coming up, so we built out this web version, we printed out some invitation codes, so that everyone in the party can join in, take photos, and honestly, it broke many times during the event”

Workedvalidationfeature-development

Starter Story · 2026-05-10

Once · B2C · disposable camera app for events

Charge per event based on guest count: $2 for 10 guests, $50 for 150

Part of a model at ~$22K/month; no pricing test reported

“our pricing is based on the number of guests that you want to invite into your event. So if it's like a small birthday party with just 10 people, it's going to be just $2, but if it's like a bigger wedding, for instance, if it's like 150 people, it'll be $50.”

Unknownpricing

Starter Story · 2026-05-10

Numbers mentioned

Subject	Metric	Value	Quote
Once	revenue	USD 20K/month approximate	“we were able to hit 20k in monthly revenue within 83 days of launch”
Once	time to milestone Launch to $20K monthly revenue	83 days	“we were able to hit 20k in monthly revenue within 83 days of launch”
Once	revenue	USD 22K/month approximate	“in terms of revenue, this month we're totaling around $22,000”
Once	users Weekly active users	10K–12K users/week approximate	“our weekly active users is around 10,000 to 12,000 users at the moment”
Once	count Events scheduled through Once in February	300 events/month approximate	“in February, there are around more than 300 events”
Once	count Events scheduled through Once for March	700 events/month approximate	“for March, we got around 700 events coming up real soon”
Once	price Tier for ~10 guests	USD 2per event /one-time	“if it's like a small birthday party with just 10 people, it's going to be just $2”
Once	price Tier for ~150 guests	USD 50per event /one-time	“if it's like a bigger wedding, for instance, if it's like 150 people, it'll be $50”
Once	count Friends from personal network who agreed to try it at their events (Halloween, birthday, wedding, networking)	4 events	“it was four friends who said, "Okay, I would love to try it."”
Once	activity volume Event hosts found via Instagram hashtags and listed for cold messages	250–300 people approximate	“across platform, we had around 250 to 300 people listed out”
Once	count Replies from ~250 cold messages (~6%)	15 replies approximate	“Amongst the 250 people, we got around 15 people who reached back and we got around 12 events fixed for that single month”
Once	count Events booked from cold outreach in one month, before the app was built	12 events/month approximate	“Amongst the 250 people, we got around 15 people who reached back and we got around 12 events fixed for that single month”
Once	time to milestone Time to build the web-app prototype	1–2 weeks approximate	“So the first version took around a week or two.”
guest's previous venture-backed B2B startup	team size	50 people approximate	“It was more of a heavy sales-driven, 50-person company”