Ahrefs

Dmitry Gerasimenko started building Ahrefs in Singapore in 2010, bootstrapping from personal savings. The original product was a backlink index — a database of links pointing to websites across the internet, useful for SEO analysis. Dmitry and a tiny team spent years building the web crawling infrastructure before launching publicly. Ahrefs grew its link database to be the second-largest web index after Google, updating billions of pages constantly. The product expanded from backlinks to keyword research, site auditing, content analysis, and rank tracking — becoming a full SEO toolset. Ahrefs became the industry standard for professional SEOs and content marketers, known for data accuracy and crawler freshness. Revenue grew to $100M+ ARR entirely through word-of-mouth and organic SEO content. Dmitry famously refused to raise VC, refused to advertise (for years Ahrefs spent zero on paid acquisition), and grew the company through product quality and a culture of radical transparency. A monument to bootstrapped technical ambition: building Google-scale web infrastructure without institutional capital.