Your domain extension shapes first impressions before anyone visits your website. It signals what kind of company you are, which audience you serve, and how seriously you take your online presence. Choosing the wrong TLD costs you credibility with customers and investors. Choosing the right one gives you a branding advantage from day one.
Here’s what actually matters when picking a TLD for a startup — and what doesn’t matter as much as you think.
The Real Differences Between TLDs
.com is the default. If your desired name is available as a .com, buy it. No further analysis required. Over 160 million .com domains are registered because everyone — from your grandmother to a venture capitalist — trusts .com instinctively. It signals permanence, legitimacy, and global reach. The downside is availability: most good single-word and two-word .com names were registered decades ago. You can check what’s still available using our availability checker.
.io became the unofficial startup TLD around 2015 and still carries strong tech credibility. Y Combinator companies, developer tools, and SaaS products use .io extensively — it signals “we’re a tech company” without needing to say it. Registration costs $30-50/year. The practical risk: .io is the country code for British Indian Ocean Territory, and there have been periodic concerns about its long-term governance. That said, ICANN has indicated it will maintain .io even as the territory’s geopolitical status changes.
.ai has exploded since 2023. If your startup is genuinely an AI company, .ai is arguably as strong as .com for your market. It’s an instant signal to investors and customers that you’re in the AI space. The premium is real — both in registration costs ($80-100/year) and aftermarket prices. Use our domain age checker to assess whether an .ai domain you’re considering was recently registered (speculative) or has been held for years (more established value).
.co works as a .com alternative when the .com is taken, but it carries a risk: users will type .com by habit and end up on someone else’s site. If you choose .co, be prepared to eventually acquire the .com or accept that some traffic will leak. Major companies like Twitter (t.co) and Google (g.co) use .co for URL shortening, not as their primary brand domain.
.dev and .app are Google-operated TLDs with a built-in advantage: they require HTTPS by default (HSTS preloaded). Every .dev and .app domain automatically forces secure connections. They’re excellent for developer tools, open-source projects, and mobile apps. Registration is $12-15/year. You can verify the HTTPS enforcement with our SSL checker.
.xyz, .info, .biz — avoid these for startups. They carry strong spam associations from years of being used for low-quality websites. Regardless of your actual product quality, these extensions create an immediate credibility deficit that you’ll constantly fight against.
SEO Impact: Less Than You Think
Google has confirmed repeatedly that TLD choice does not directly affect search rankings. A .io site can outrank a .com site for the same keyword if it has better content, more backlinks, and stronger technical SEO. The indirect effect is real though: .com domains tend to get higher click-through rates in search results because users trust them more, and higher CTR can indirectly improve rankings over time.
Country-code TLDs (.fr, .de, .co.uk) do carry a geographic signal. Google may prioritize a .fr domain for French-language searches. If you’re targeting a global audience, stick with a generic TLD.
The Decision Framework
If the .com is available: buy it. If it’s not, and you’re a tech startup: try .io or .ai (depending on your space). If you’re building a developer tool or app: consider .dev or .app. If none of these work, get creative with the name itself rather than settling for a weak extension. “LinearApp.com” is stronger than “Linear.biz.”
Whatever you choose, run it through our availability checker to see the full TLD landscape. You may find your preferred name is taken on .com but available on .ai — and depending on your product, that might actually be the better choice.
