GTM Sauce

Sub Club by RevenueCat · 2026-09-02

Scaling Meta Ads from zero to $100K a month — Ethan Ethier, Built With Science

Ethan Ethier (Built With Science, fitness app from YouTuber Jeremy Ethier's 7M-subscriber channel) explains why a big audience gave a launch spike but not durable growth, why they spent a year fixing trial-to-paid before any ads, and how they scaled Meta in-house without Jeremy on camera, sending ~90% of paid traffic to a long web quiz. Also covers a gym buddy two-person plan, an annual-first pricing page that moved plan mix from ~60% to 75-80% annual, SEO/AEO calculators, quiet launches and a problem-first experimentation process.

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21 tactics

Built With Science · B2C · science-based fitness coaching app

Founder says it lifted the floor for every channel; paid traffic later converted at 25%
“as long as we're constantly improving our trial to paid and retention, that lifts the floor for everything else”
Workedproduct-activationpaid-social
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

A launch spike, then a steady trickle; not a growth engine on its own
“when we did launch the app, we had hyped it up obviously to our members and also to just our email lists and publicly. So we did see a spike when we officially launched it”
Mixedpr-launchemail
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Story videos bring more trials than broad educational ones; old videos give steady monthly trials
“if it's more of a educational broad type of content where maybe we're sharing a specific diet or a workout program, a program that reaches a higher audience, larger audience, then that might not necessarily get the same amount of trial activations as to a video that where maybe we're telling a story about someone who started on the app”
Workedfounder-brandcontent
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Some clips go viral; their hooks now shape new long videos
“we just onboarded a few clippers who are taking some of our existing long form and posting that across Instagram Reels and TikToks”
Workedorganic-short-videougc-creators
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Scaled from zero to ~$100K/month (host figure); 25% trial-to-paid
“everything we've done from that end is mainly through B-roll cell videos. We've used some testimonial content, a lot of statics now with AI.”
Workedpaid-social
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Took about a month to get a baseline to set the allowed cost per customer
“we just needed to get a baseline of what that number would be in order for us to calculate how much we could actually spend to acquire a customer. So that took around a month to do”
Workedanalytics-attributionpaid-social
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Clickbait ads brought cheap trials but a huge drop in trial-to-paid
“We've tested a lot of ads that are more like, I guess, click baity-style or encourage a click and encourage someone to start a trial, but we can quickly see from the trial to paid that this is not the user that resonates the best with the app.”
Mixedpaid-social
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

“one of our engineers built a custom dashboard where basically we can see and validate that every single new trial is coming specifically from Meta, just because with all our organic reach right now, Meta can often blend who's coming from where”
Unknownanalytics-attributionpaid-social
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Quiz beat direct-to-store; now gets ~90% of traffic; same quiz in the iOS app did worse
“it educates the user on the actual product, it overcomes objections, and it increases the perceived value of the product while also helping them understand how personalized the product actually will be for them”
Workedweb-to-apponboarding
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Kept $189/year since launch; 35-40% organic and ~25% Meta trial-to-paid
“the positioning of it is you're comparing costs of a personal trainer versus a trainer in your pocket. So that way we can charge a little bit more premium.”
Workedpricingpositioning-niche
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

15% of trial starts add a buddy; higher order value and better retention
“we offered users the option to add a gym buddy, we call it, to their plan and get their plan at a discounted rate”
Workedupsell-expansionpricing
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Working well, founder says; tools convert slightly better than blog posts
“we decided to invest in hiring an external consultant to help us with some of this AI search”
Workedseoweb-to-app
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

~70% of tests fail first time; written notes turn failures into later winners
“we'll list out as many problems as to why that pricing page isn't converting before anything else”
Workedexperimentation
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Founder says it gives cleaner reads than email-hyped launches; no numbers
“this often inflates a lot of the engagement metrics that you obviously want to measure when you launch a new feature. So we've actually taken the opposite approach where we'll roll out a new feature, we won't say anything, and we'll just see how the metrics do on its own.”
Workedfeature-development
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

One of customers' favorite features, founder says; no numbers
“Jeremy AI has actually been one of our customer's favorite features”
Workedproduct-activationretention
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Founder says it adds credibility; no numbers
“he'll reach out to some of the expert researchers and coaches and dieticians to collab with for videos in terms of promoting some of the research that they find”
Workedcontentpositioning-niche
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Annual picks rose from ~60% to 75-80%, with no price change
“all we did was change the layout so that it presented the annual upfront and reduced risk of actually starting the free trial. So we didn't change the price, we didn't change the positioning. It was simply a UI shift, which had a massive impact for us.”
Workedpaywallpricing
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Hurt conversion; extra text overwhelmed buyers who were ready to start
“Adding more context onto this page seemed to actually hurt the conversions a lot more than not having anything at all.”
Failedpaywall
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Quite negative, even with a 30-day money-back guarantee
“we are also testing a no trial offer compared to the 14-day free trial. We though it'd be a big win just because a lot of our traffic right now is organic and they're already warm and trust the brand, but we're seeing it's quite negative”
Failedpaywallpricing
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

Very strong lift after a few weeks, vs the version that shamed the trial
“we actually have been rolling out another arm. It's been a few weeks now where we make both options seem pleasant, so it's not one framed as good or bad. It's more of like, "Okay, they're both good." And that actually has been a very strong lift.”
Workedpaywallexperimentation
Sub Club by RevenueCat · 2026-09-02

Built With Science · B2C · science-based fitness coaching app

One of the year's top videos; decent but not major app conversion
“It definitely was one of our highest performing videos this year, and it was honestly very fun to do. We rented out a full studio, brought in all these participants”
Mixedcontentfounder-brand
Sub Club by RevenueCat · 2026-09-02

Numbers mentioned

SubjectMetricValueQuote
Built With Scienceusers
People who joined the web-based courses before the app
100K users
approximate
“which about a hundred thousand people joined over the course of the years”
Built With Sciencefollowers
YouTube subscribers when they decided to build the app
1M subscribers
approximate
“at that point, I think there was around a million or so subscribers”
Built With Sciencefollowers
YouTube subscriber growth per year
+1M subscribers/year
approximate
“I think we're growing around a million or so subscribers per year”
Built With Sciencefollowers
YouTube subscribers at app launch
3M subscribers
approximate
“Even when you launched it with three million subscribers, was it just a massive spike?”
Built With Sciencefollowers
YouTube subscribers now
7M subscribers
approximate
“now they've got over seven million subscribers on YouTube”
Built With Sciencead spend
Meta ad spend, scaled from zero in 2026, described by host as profitable
USD 100K/month
approximate
“Y'all have scaled up from nothing to $100,000 a month in ad spend profitably”
Built With Sciencetime to milestone
Time to get a Meta trial-to-paid baseline before scaling spend
1 months
approximate
“So that took around a month to do, and once we had a good set of numbers to work with”
Built With Scienceshare
Share of (paid) traffic sent to the website quiz rather than the App Store
90%
approximate
“about 90% of our traffic is actually going to our website, and we have a really long personalized quiz that we send all leads to”
Built With Scienceprice
Annual plan, unchanged since launch
USD 189/year
approximate
“about $189 for the year or $30 a month”
Built With Scienceprice
Monthly plan
USD 30/month
approximate
“about $189 for the year or $30 a month”
Built With Scienceconversion rate
Share of trial starts who add a gym buddy to their plan
15%
approximate
“Around 15% of anyone who starts a trial will actually add on a gym buddy”
Built With Scienceprice
Discount each user gets on the gym buddy two-person plan
15%“Just 15%. Both users will get 15% off.”
Built With Scienceconversion rate
Trial -> paid for warm organic traffic from YouTube
35–40%
approximate
“for our warm traffic, our organic traffic coming from YouTube, we are around the 35 to 40% range”
Built With Scienceconversion rate
Trial -> paid for Meta ad traffic
25%
approximate
“trial to paid for Meta is slightly lower around 25%”
Built With Scienceshare
Share of subscribers choosing the annual plan, after the annual-first pricing page experiment
75–80%
approximate
“So right now it's about 75 to 80% choose the annual.”
Built With Scienceshare
Share choosing annual before the pricing page experiment (60/40 annual/monthly)
60%
approximate
“I think it was around 60/40 before that.”
Built With Scienceshare
Host's recap of annual share after the experiment; conflicts with guest's 75-80%
85%
approximate
“you were saying that something like 85% of people choose the annual plan, that's since you rolled this experiment out, right?”
Built With Scienceshare
Share of traffic historically coming from SEO (old blog posts), since declining with AI search
30–40%
approximate
“So about 30 to 40% of our traffic coming in was from SEO”
Built With Scienceshare
Share of experiments that fail on the first attempt
70%
estimate
“probably 70% of the experiments that we run fail on the first go”
Built With Sciencecount
Core beta group of former web-course members
100 users
approximate
“we have a group of about a hundred people who were actually our previous web-based course members”
Built With Sciencecount
Wider beta tester pool
1,000 users
approximate
“we also have a slightly bigger pool with about, I think, a thousand or so beta testers”
Built With Scienceprice
Discount for paying upfront with no trial (vs 14-day free trial), in a paywall test
20%“you could pay upfront and get 20% off, or you could toggle off and just take the 14-day free trial”