Choosing Between .io, .app, .dev and Other New Extensions

Newer domain extensions have carved out specific identities in the tech and startup world, distinct from traditional .com.

.io

Popular with tech startups, originally the country code for the British Indian Ocean Territory — valued for its short length and "input/output" association in tech culture.

.app

Requires HTTPS by default (built into how browsers handle the extension), making it a natural fit for app-focused products and reinforcing security from day one.

.dev

Also requires HTTPS, popular for developer tools, portfolios, and technical projects specifically.

The Trade-Off

These extensions are less universally recognized than .com by average consumers — a good fit for tech-savvy audiences, less ideal for a general local business targeting broad recognition.

Further Reading

• Contact Our Domains Team
• Business Email Plans
• ICANN