Writing9

A solo founder scratching their own itch built an IELTS exam preparation assistant that helps students practice and improve their writing skills through automated feedback and scoring. Writing9 carved out a focused niche in standardized test prep, offering AI-powered essay evaluation that gives learners instant, actionable insights on their IELTS writing tasks. The subscription-based SaaS grew steadily by targeting an underserved but massive global audience of test-takers, now generating $12,000 per month in recurring revenue—proof that deeply specialized, utility-driven products can build reliable income streams without chasing trends.