The New TLDs That Are Actually Working (.io, .co, .ai and Why)

Stripe launched on stripe.com in 2010 and stayed there. But thousands of other tech startups that launched around the same time built their businesses on stripe.io-style .io addresses. Today, .io is so thoroughly associated with technology companies that using it is almost a market signal in itself. That's a remarkable outcome for a country-code domain originally assigned to the British Indian Ocean Territory.

How did that happen? And which other TLDs have managed to pull off something similar?

.io: The Accidental Tech Standard

The story of .io's rise is mostly organic. Early developer communities and Y Combinator startups adopted it in waves around 2010-2012, partly because .com names were already taken for anything clean and short, and partly because "io" had a natural association with input/output in programming contexts. Companies like GitHub, Keybase, and hundreds of developer tools launched on .io and brought their audiences with them.

The extension now has a self-reinforcing reputation. Developers expect tech products to sometimes use .io. Investors don't flag it as unusual. It's become legitimized by the caliber of companies that chose it early. This is exactly how domain extensions build credibility — not through top-down adoption but through enough respected early adopters that the extension inherits their reputation.

.co: Intentional Startup Energy

.co's story is more deliberate. When Colombia opened its registry to commercial use, the extension found favor with startups and founders for a combination of reasons: it's genuinely short (shorter than .com by one character), it sounds intentional rather than like a failed .com bid, and early adopters included companies like AngelList and Overstock (which moved its main URL to o.co for a period).

It's held up well, particularly for founder-led businesses and venture-backed startups. It doesn't carry the "why don't they have the .com?" skepticism that many other alternatives do, because it's been used confidently enough by legitimate companies that audiences have largely normalized it.

.ai: Right Place, Right Time

.ai belongs to Anguilla, but nobody using it is thinking about the Caribbean. The extension became synonymous with artificial intelligence companies around 2018-2020, when the AI boom drove demand for brand names in that space. OpenAI could have been OpenAI.com, but Runway.ml, Hugging Face (huggingface.co), and hundreds of other AI tools normalized non-.com extensions in the space.

Today, a company building AI products that uses a .ai domain is making a statement about their focus. The extension functions almost as a category tag. That's valuable brand signaling that you get for free if you're in the right industry.

The Common Thread

Each of these successful TLDs found adoption through a specific community that needed it, not through marketing or general promotion. The lesson for anyone choosing a domain extension: look at what respected companies in your specific industry are using, not what's generally popular. Community-specific credibility matters more than universal recognition in your early years.