Starter Story Build · October 1, 2026

Jake Castillo's UGC Playbook: From the First Creator to 300

Jake Castillo says he would take an app from zero to $10K a month in revenue with UGC alone, without raising much money or spending much on paid ads. He co-founded Cal AI and served as its CMO. Cal AI launched in May 2024, reached 15 million users in under 18 months, and was acquired by MyFitnessPal. Starter Story Build published the interview on 1 October 2026. He splits the system into five steps: find creators, warm up their accounts, pick a content format, check the money, then scale.

Speaker
Jake Castillo
Where
Starter Story Build
Published
Length
15 min

Jake Castillo: Co-founder of Cal AI, where he served as CMO.

Recording: I Built A $30M iOS App: This is My Growth Playbook

Key points

  1. 1

    Creators are the input

    Influencer marketing was Cal AI's main growth channel. AI means more apps launch than ever, so more companies chase the same influencers, and large ones cost too much for a solo founder. Castillo uses UGC creators instead: everyday people who open a new account just for your app. Post a job on SideShift, or search for UGC creators on TikTok and Instagram. Pick people who talk to the camera and have one talking-head video past a million views. Start with 10 videos at $10 each. If they are good, move to 30 videos a month at $30 each, with bonuses at 100K, 500K and 1M views. Negotiate on a call, not by email.

    “the biggest lesson I learned from all of this is that good outputs start with great inputs and creators are your inputs”
    Jake Castillo, Starter Story Build, 02:01
  2. 2

    Warm up the account before the brand appears

    The creator opens a new account for your app. For about 30 minutes a day they watch, like and comment in the niche, like a normal user. Then they post a few niche videos that do not mention your brand. TikTok and Instagram spot creator accounts that post branded content and shadowban them, so the videos never reach the algorithm. The warm-up proves the account is clean.

    “And then once you see a video breaks a thousand views, you can have them start posting actual branded content.”
    Jake Castillo, Starter Story Build, 05:38
  3. 3

    Magic moment or painful problem

    Castillo calls the content format the most important step. First question: does the app have a magic moment, a feature so visual that viewers do a double take? Cal AI did. Then the creator tells the most viral story they can and shows the app at a natural point. Expect more views and a lower conversion rate. With no magic moment, ask whether the app solves a painful problem. If it does, open on the problem until viewers see themselves, then bring in the app, for fewer views and higher conversion. If neither is true, rethink the product or its positioning.

    “where you will have the creator make the most viral story they possibly can, and then find a natural point within that story”
    Jake Castillo, Starter Story Build, 06:40
  4. 4

    Scale when revenue per 1,000 views beats the cost

    His worked example: $900 buys 30 videos, which get 600K views, a $1.50 CPM. At two installs per 1,000 views that is 1,200 installs. A 10% conversion rate gives 120 paying users, and at $20 each that is $2,400. So revenue per 1,000 views is $4. He calls two installs per 1,000 views the bare minimum. Below it you have a content problem or an app problem. New accounts are slow: 20 videos can sit under 5K views before the 21st gets 200K.

    “if I'm paying a $1.50 to acquire a customer that pays me $4, then I'm ready to scale.”
    Jake Castillo, Starter Story Build, 10:29
  5. 5

    Assume every creator gets cut

    Each creator has to earn renewal with data. Castillo checks three things. Economics: did their views earn more than they cost? Intent: do the comments ask what the app is, or tag friends? Correlation: did a viral video line up with a download spike in App Store Connect? For each creator cut, bring in two. At about 50 active creators, hire one creator manager per 50. His rough ranges: about $10K a month at 5 to 10 creators, $100K to $200K at 50, and millions at 100 to 300.

    “And I start my analysis for every creator under the assumption that I'm going to cut everyone.”
    Jake Castillo, Starter Story Build, 12:02

Where experts disagree

Roy Lee hires for reach that people already own. He says every person on his marketing team has over 100,000 followers on some platform. Castillo starts each creator on a new account with no following, warms it up, and pays per video. He expects 20 slow videos before one breaks out.

Roy Lee: everyone on the team has 100,000 followers

Matt Swulinski says paid ads are the easiest way to check that a product can scale, and he says to run them early to test messages and funnels. Castillo pitches UGC as the way to reach $10K a month without heavy ad spend. His test is creator spend against revenue per 1,000 views.

Matt Swulinski: paid ads validate that a product can scale

How it compares

How this recording lines up with what Jake said before and with other operators Gavel cites.

Agrees with

Greg Isenberg puts distribution first and product second. Castillo credits his co-founder Blake Anderson with the same order at Cal AI: start with the viral video idea, then build a product that fits it.

Greg Isenberg's Distribution as Moat

Builds on

In an earlier interview, Castillo said not to pay for viral hits. Pay flat fees, take the risk up front, and keep the upside. This talk keeps the flat fee of $30 a video and adds view bonuses at 100K, 500K and 1M views.

Jake Castillo: pay flat fees, not for viral hits

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