“Should I go with .com or .io?” I hear this question constantly from developers launching side projects. Having built tools that check thousands of domains across both zones, I have data-backed opinions. Short answer: it depends on your audience.

The Numbers

Let’s start with facts, not feelings:

.COM vs .IO domain comparison
	.com	.io
Registration price	$8–12/year	$30–50/year
Renewal price	$12–15/year	$30–50/year
Global recognition	Universal	Tech community
Available short names	Almost none	Many
SEO impact	Neutral (default)	Neutral (confirmed by Google)
Email trust	High	Medium
Country code?	No (gTLD)	Yes (British Indian Ocean Territory)

When .COM Is the Right Choice

For anything customer-facing, B2C, or targeting a non-technical audience.

My grandmother types “.com” by default. Your customers probably do too. There’s a reason 50%+ of the world’s websites use .com — it’s the mental default for “website address.”

Cold emails from a .com domain have measurably higher open rates than from alternative TLDs. Spam filters are more forgiving with .com. If you’re doing any kind of outbound sales or email marketing, .com matters.

The catch: Every good .com is taken. In our database, over 95% of checked .com domains with 4–7 characters are registered. You’ll need to get creative with word combinations or pay aftermarket prices ($500–$50,000+) for a premium name.

When .IO Makes More Sense

For developer tools, SaaS products, APIs, and tech-focused projects.

The tech community adopted .io because it suggests “input/output” — a developer concept. Projects like socket.io, github.io, and npm.io normalized it. If your users are developers, they won’t think twice about a .io domain.

The biggest advantage: availability. Short, brandable .io names that would cost $10,000+ as .com are often available at standard registration price. I regularly find 4–5 letter .io domains that are free to register.

The downsides are real though:

3–4x more expensive. $30–50/year vs $10–12 for .com. Over 10 years, that difference adds up.
It’s technically a country code. .io belongs to the British Indian Ocean Territory. There have been discussions about the territory’s sovereignty affecting the TLD’s future. The risk is theoretical but not zero.
Non-tech people won’t remember it. Tell your parents your website is “something dot I-O” and watch them type something.com.

What About .ORG, .NET, and Others?

.org

Traditionally for nonprofits and open-source projects. If you’re building a commercial product, .org sends mixed signals. But for open-source tools, community projects, or nonprofits — it’s perfect and carries trust.

.net

The “I couldn’t get the .com” TLD. Harsh but true. There are exceptions (like asp.net), but in most cases, a .net domain signals that you settled. If your .com is taken, I’d rather try a different name than go with .net.

New TLDs (.app, .dev, .ai)

.ai is having a moment thanks to the AI hype. .app and .dev (owned by Google) enforce HTTPS by default, which is nice. But they’re still niche. Use them for landing pages or side projects, not your primary business domain.

My Recommendation

If you can get a good .com — get it. It’s the default, it’s cheap, it’s universal. “Good” means short (under 10 characters), easy to spell, no hyphens or numbers.

If the .com is taken or terrible, go with .io for tech projects. Your developer audience won’t care, and you’ll get a much better name for your money.

Never compromise on the name itself to get a specific TLD. greatname.io beats not-great-name-2024.com every time. The name matters more than the extension.

Not sure what’s available? Check any domain across .com, .io, and .org simultaneously with our free tool.

.COM vs .IO — Which Domain Extension Should You Choose?