Choose .ai if your product is genuinely about artificial intelligence — the extension reads as a category label — and choose .io for general software, developer tools and SaaS, where it reads as input/output. Both are repurposed country codes (.ai = Anguilla, .io = British Indian Ocean Territory) adopted worldwide for tech; .ai tends to cost more, and neither harms your search ranking.
Two country codes that became tech brands
Neither .io nor .ai was created for technology — both are country-code TLDs. They became tech defaults by linguistic accident: "io" reads as input/output, and "ai" reads as artificial intelligence. As short .com names disappeared, founders reached for these instead, and the meaning stuck. Choosing between them is mostly a question of what your product is.
.io vs .ai — comparison table
Origin, what each reads as, typical users, price level and ranking effect.
| Factor | .io | .ai |
|---|---|---|
| Type | Country-code TLD (ccTLD) | Country-code TLD (ccTLD) |
| Assigned to | British Indian Ocean Territory | Anguilla |
| Reads as | input/output (I/O) | artificial intelligence (AI) |
| Best for | SaaS, developer tools, APIs, general software | AI/ML products, models, AI agents |
| Price level | Mid-premium | Premium (often higher, multi-year terms) |
| Geo-targeting | Treated as generic in practice | Treated as generic in practice |
| SEO ranking effect | None | None |
Delegation facts from the IANA root zone database. Price levels are relative postures, not quotes — confirm live pricing at your registrar.
When .io wins
.io is the established default for software companies that are not specifically about AI: developer platforms, APIs, infrastructure, SaaS dashboards and side-projects. It has a decade of credibility in the tech community, short names are still findable, and "io" pairs naturally with technical brand words. If your product is "software that does X", .io is the safe, on-message pick.
When .ai wins
.ai is the right call when artificial intelligence is the point of the product — a model, an AI assistant, an ML tooling company. The extension functions as a one-word category statement and aligns you with the fastest-growing software category. The trade-offs are cost (it is typically the pricier of the two) and the risk of looking dated if "AI" stops being your core story.