I had a founder ask me this in almost exactly these words: "Is it embarrassing to launch a startup on a .io domain?" He'd been unable to get the .com, the .co was also gone, and he was staring at a .io that felt like a consolation prize.
The honest answer I gave him: no — but it depends entirely on what you're building and who your customers are.
Domain extensions have real meaning in certain markets and zero meaning in others. Getting this wrong either costs you credibility or costs you money for a .com you didn't need. Here's how to think through it properly.
The Three Tiers of Extension Recognition
Before we get into specific extensions, understand that not all extensions are equally recognised by all audiences.
Universally understood: .com, .org, .net. Everyone knows what these are. When someone hears your brand name and types the URL without being told the extension, they will type .com.
Tech-community recognised: .io, .ai, .dev, .app. Software developers, startup founders, and tech investors understand and accept these. They don't signal anything negative in that context — they're just normal. A non-technical customer, however, may be confused or may not trust the extension.
Niche or regional: Everything else — .co, .studio, .shop, country codes. These work in specific contexts but require more explanation outside those contexts.
When .io Makes Sense
.io became the default tech startup extension about a decade ago and has stayed that way. It started as the country code for British Indian Ocean Territory, but it was co-opted by the tech world because "io" is a reference to input/output — the most fundamental concept in computing.
Use .io if: you're building a B2B SaaS product, a developer tool, or a technical platform, and your customers are primarily in the tech industry. The extension reinforces your positioning. It signals modern, technical, startup-native.
Don't use .io if: you're selling to consumers, to non-technical business buyers, or to industries where technology is unfamiliar. A .io domain for a plumbing company, a restaurant, or a law firm will confuse people.
The premium for a good .io domain is also usually lower than the equivalent .com, which can be practically useful if your brand name's .com is owned by someone charging $50,000 for it.
When .ai Makes Sense
.ai is the country code for Anguilla, and like .io, it was adopted by a particular industry — in this case, artificial intelligence companies. Since 2022, .ai has become genuinely mainstream in the AI and machine learning space.
Use .ai if: your product is genuinely AI-focused, your customers are in the AI or tech space, and the extension reinforces your positioning as an AI-native company. This is one of the few extensions where the brand association is strong enough that it adds meaning rather than just being a fallback.
Don't use .ai as a marketing ploy. If your product is not meaningfully AI-powered, using .ai is positioning theatre that will backfire when customers actually use your product.
When .co Makes Sense
.co is Colombia's country code but has been marketed heavily as a .com alternative ("co" for company, collaboration, community). It's more widely recognised than .io or .ai among general consumers, but still not as trusted as .com.
Use .co if: your brand name's .com is taken and the .co is available and you can't find a strong alternative. It's a better fallback than most extensions for general business use. Also useful for community or collaborative brands where "co" carries meaning.
The risk: you'll occasionally lose traffic to whoever owns the .com. This is a real, persistent cost. If the .com owner is a competitor or runs a confusingly similar business, .co is not a viable choice regardless of how much you want the name.
The Case for Owning the .com Anyway
If budget allows, even if you build on .io or .ai, try to own the .com and redirect it to your main domain. This protects you from two things: competitor confusion if someone buys it, and the future scenario where your company outgrows the tech-startup audience and needs to appear credible to more mainstream buyers.
Our premium domain portfolio is built on this principle — every domain name we've acquired is a short, memorable .com that works across contexts. When you're building a brand that's meant to last, that's still the standard. Names like ZoningGraph.com and Fundegrity.com are valuable partly because of the extension.
What Your Extension Signals to Investors
If you're building a venture-backed startup, your domain extension matters for a different reason: perception. Many investors — especially outside the tech world — still associate .com with legitimate, established businesses and alternative extensions with bootstrapped or early-stage companies.
This is changing, particularly for AI and SaaS companies where .io and .ai are now completely normal. But if you're raising money from non-tech investors (private equity, family offices, traditional VCs in non-tech sectors), a strong .com still signals seriousness in a way that .io doesn't.
The Naming Comes First
One thing I tell every founder: pick the name before you agonise over the extension. A great name on .io is better than a compromised name on .com. The brand identity you build — your logo, your brand system, your voice and positioning — all of that rests on the name, not the extension.
Once you have the right name and a working domain, read our guide to building a complete brand identity to understand what comes next.
For the full framework on choosing a domain name from scratch, start with how to choose a domain name for your brand. If the .com is taken, we cover your options in detail in what to do when your perfect domain is taken.
Got the domain. Now build the brand.
Evoke Studio creates complete brand identity systems — logo, colour, typography, and brand guidelines — built to work across every format and context.
Yes, if your audience is in the tech space. .io is well-established among developers, SaaS founders, and tech investors. It signals startup-native and modern. For non-technical audiences or more traditional industries, it may cause confusion or reduce trust.
If your product is genuinely AI-powered and your customers are in the AI or tech space, yes — .ai reinforces your positioning. If you're using 'AI' as a marketing term for a product that isn't fundamentally AI-driven, the extension may backfire when customers look more closely.
.com is the original and most trusted commercial extension, used by the vast majority of established businesses. .co is Colombia's country code, marketed as a company/community alternative to .com. .co has broader mainstream recognition than .io but still carries a higher risk of traffic leakage to the .com version of your name.
Own your primary extension and redirect the most obvious alternatives (.com if you're on .io, .net if you're on .com, etc.). At minimum, protect yourself from competitors or squatters taking the .com version of your name. Active websites on multiple extensions create SEO problems — always redirect everything to one canonical domain.
These branded TLDs can work for niche contexts — a design studio using .studio, a retailer using .shop. They add specificity and can be memorable. The downside is that they require more explanation to less technical audiences and may not be taken seriously by all customers. Evaluate based on your specific audience.
Google has stated that it does not treat standard alternative extensions (.io, .co, etc.) differently from .com for ranking purposes. What matters for SEO is domain authority, content quality, and backlinks — not the extension. Country-code TLDs like .co.uk may be geographically weighted, which matters if your audience is primarily in one country.
Quick Answers
.io is the country code for British Indian Ocean Territory, but it's been adopted by the tech startup community as a shorthand for input/output. It's now a standard choice for SaaS products, developer tools, and tech platforms.
Yes, .co is a legitimate and recognised extension. It's less universally trusted than .com but more mainstream than most alternatives. The main risk is losing traffic to whoever owns the .com version of your domain name.
Generally no. Outside the tech industry, .io can cause confusion or reduce trust. A law firm, restaurant, or traditional business is better served by .com or a relevant country-code extension.
Yes, but it costs you SEO equity and requires significant work — 301 redirects, updated sitemap, Google Search Console reconfiguration, and outreach to backlink sources. Do it right once rather than planning to change later.
.net is widely recognised and was originally meant for network or technical organisations. It's a better fallback than most alternatives for general business use, though the traffic-leakage risk from .com still applies.