King of Apps is a public leaderboard where apps are ranked only by how much their makers paid. No algorithm, no voting, no editor: pay to climb, top up to defend, and every click goes straight to the app. A new listing starts at $4 one-time with no expiry; outbid someone by $1 to take their rank, and if you get outbid, pay only the difference to win it back. The board is also published as Markdown, JSON and llms.txt for AI agents and crawlers.