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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Numbers mentioned
| Subject | Metric | Value | Quote |
|---|---|---|---|
| Built With Science | users 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 Science | followers 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 Science | followers YouTube subscriber growth per year | +1M subscribers/year approximate | “I think we're growing around a million or so subscribers per year” |
| Built With Science | followers 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 Science | followers YouTube subscribers now | 7M subscribers approximate | “now they've got over seven million subscribers on YouTube” |
| Built With Science | ad 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 Science | time 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 Science | share 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 Science | price Annual plan, unchanged since launch | USD 189/year approximate | “about $189 for the year or $30 a month” |
| Built With Science | price Monthly plan | USD 30/month approximate | “about $189 for the year or $30 a month” |
| Built With Science | conversion 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 Science | price Discount each user gets on the gym buddy two-person plan | 15% | “Just 15%. Both users will get 15% off.” |
| Built With Science | conversion 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 Science | conversion rate Trial -> paid for Meta ad traffic | 25% approximate | “trial to paid for Meta is slightly lower around 25%” |
| Built With Science | share 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 Science | share 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 Science | share 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 Science | share 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 Science | share 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 Science | count 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 Science | count 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 Science | price 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” |