
How Ellie Fausett Turned Her Public-Health Research Into the Vector Guard App
Epidemiologist Ellie Fausett and BUILT BY FOUNDRY turned years of field research into Vector Guard, an iOS app for identifying ticks and mosquitoes and staying safe outdoors.
Read the case study → (opens in a new tab)Who Is Hank Green?
The Problem: Attention Is Under Attack
How Focus Friend Works
- Focus timers with Pomodoro-style breaks
- Deep Focus Mode that locks distracting apps
- Live Activity so you can see progress from your lock screen
- Customizable beans (Coffee Bean, Edamame, Kitty Bean, and even John and Hank Green Beans)
- Room decorations you earn by completing focus sessions
Why It Blew Up
- 1.4 million downloads total
- 4.7 star rating from 3,500+ reviews
- #1 free app on the App Store (August 2025)
- Google Play App of the Year (November 2025)
- ~$100K monthly revenue (estimated)
The ADHD Connection
- No punishment for distraction—the bean gets sad, but you can always try again
- Calm visuals—no flashing alerts or aggressive notifications
- Dopamine-friendly rewards—decorations and bean skins create positive feedback loops
- Simple interface—no overwhelming features or complex setup
What Creators Can Learn from Hank Green
Watch us tear down a creator business, live
Every Thursday at 11 AM PT we take a real creator business and show the app hiding inside it: the wedge, the paid loop, the pricing, and what would sink it. Free, and the replay goes to everyone who registers.
Save your seat → (opens in a new tab)The Math Behind Focus Friend
- 1.4 million downloads (free)
- ~$100K monthly revenue (subscriptions + cosmetics)
- $1.99/month or $14.99/year for Pro
- $2.99-$5.99 for cosmetic purchases



