AI-powered design tool generates polished mobile app UIs in minutes. Built exclusively for mobile apps—in a niche with no direct competitors—it turns ideas into prototypes fast without the complexity of horizontal suites. Revenue declined after the founder stepped back from marketing to focus on improving the product.

Setter AI (via TrySetter) is an AI-driven lead engagement and appointment-booking assistant designed to help businesses capture more sales opportunities. It instantly follows up with new leads (in ~10 seconds), engages them in natural dialogues and guides qualified prospects into scheduled meetings via channels like WhatsApp, SMS & your website chat. With deep calendar integrations and automated follow-ups, it reduces missed opportunities and boosts conversion without more headcoount.

Find proven startup ideas. (+20,000$ revenue outside of Stripe).