.co vs .io
Two ccTLDs repurposed for the global startup ecosystem. The .co extension is positioned as a .com alternative with 'company' connotations, while .io appeals specifically to tech and developer audiences through its I/O association.
Choose .co for consumer-facing startups and general business use. Choose .io for developer-focused, API-first, or technical product brands.
| Feature | .co | .io |
|---|---|---|
| Full Name | Colombia | British Indian Ocean Territory |
| Type | Country Code | Country Code |
| Registry | .CO Internet S.A.S. | Internet Computer Bureau Ltd (ICB) |
| Registered Domains | 2 500 000 | 1 500 000 |
| Year Introduced | 1991 | 1997 |
| DNSSEC | ✓ | ✓ |