Which Domain Extension Should I Pick?

There's a lot of breathless advice about domain extensions online, most of it written by people trying to sell you on whatever they're registering. Here's the version without the spin.

The Question That Actually Matters

Before any of the extension-specific advice below: who is your customer, and what do they expect?

A domain extension is a trust signal. Different audiences have been trained to trust different extensions, and violating those expectations creates subtle friction that you probably don't want in your first impression. Keep that question in mind as you read through the options.

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.com

Still the standard. After 40 years, the .com reflex is deeply embedded — when most people hear a brand name, they instinctively type .com after it. That behavior is especially strong with mainstream consumers and anyone outside of tech.

Highest trust, broadest recognition, best for B2C.

If your customer base is general consumers, non-technical users, or traditional industries, a .com is not optional — it's table stakes. The moment someone types your name with .com and lands somewhere else, you've lost them to whatever is actually at that address.

The catch: good .com domains for common words are largely gone. You're either getting something creative (a new word, a blend, an invented term) or you're paying aftermarket prices for something common. This is why naming strategy and domain strategy are inseparable.

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.co

Clean, short, and well-understood by startup-savvy audiences. Popularized by the startup community around 2010–2014, it's now genuinely credible as a primary domain for early-stage companies.

Works well for startups targeting investors and early adopters who already know what .co means.

The risk: mainstream consumers sometimes read .co as a typo. If your customers are general public, this is a liability. If your customers are in the startup ecosystem, design community, or tech-adjacent spaces, it's fine.

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.ai

Signals AI-powered technology instantly — which is either perfect or a liability depending on your honesty about what you actually do.

Fine if you're genuinely AI-powered. Looks like posturing if you're not.

In 2024, everyone's slapping .ai on products that have a single GPT API call buried somewhere in the backend. Savvy customers notice. If AI is genuinely core to how your product works, it's a meaningful and accurate signal. If it's not, pick something else.

One more thing: .ai domains are country-code extensions for Anguilla, and they come with slightly higher registration and renewal fees than standard extensions.

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.io

The unofficial extension of developer tools and technical products. If you're building a dev tool, API, infrastructure product, or anything aimed at technical practitioners, .io reads as familiar and credible.

Strong for dev tools. Loses impact with mainstream audiences.

Non-technical users often don't know what to do with .io. If your product is for developers, this is a fine choice. If you're going after mainstream, it creates friction.

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.app

Great for products that are literally applications — consumer or prosumer software that lives in an app store or browser. Google runs the .app TLD and requires HTTPS, which is a minor but meaningful security signal.

Best for actual consumer apps where the "app-ness" is central to the product.

If your product is primarily web-based SaaS, .app can work but .com or .co might communicate more credibility at the company level. If it's a mobile-first product, .app is a natural fit.

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.co.uk

Only if you're a UK-focused business targeting UK customers. It signals local presence, which builds trust with UK audiences but limits your perceived global ambition. If you're planning to expand internationally, consider .com from the start even if your initial market is the UK.

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The Simple Guide

| Your situation | Recommended | |----------------|-------------| | B2C, mainstream customers | .com | | Startup / investor audience | .com or .co | | Genuinely AI-powered product | .ai or .com | | Developer tool or API | .io or .com | | Consumer mobile app | .app or .com | | UK-only business | .co.uk |

When in doubt: get the .com. The others are legitimate options for the right product, but .com remains the path of least resistance for the widest audience.