The number does the heavy work, as $300K a year sounds huge for a first ever app. The title adds that this was his first build, which quietly says your start could look like this too. The app store page in hand keeps it believable.
How the packaging works
Title
The title pairs a beginner story, the first app ever built, with a serious monthly figure.
Thumbnail
The live app store listing plus a yearly figure proves the app exists and restates the money at a bigger scale.
Remix this
Use this when your first attempt got a real result. Lead with the money, then let the word first make it feel reachable. Show the live product so nobody thinks you made it up.
The transferable lesson
First attempt plus real money makes success feel reachable.
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