The question usually comes up the same way. You have a name, the .com belongs to someone who has parked it since 2011, and both the .ai and the .io are available. Each one costs more than a .com and each one says something different about your company. Here is how the three compare on the things that actually matter over the life of a startup: what they cost, what rules come with them, how customers and investors read them, and what could go wrong.
.ai vs .io vs .com at a glance
| .com | .io | .ai | |
|---|---|---|---|
| What it officially is | Generic extension, created in 1985 | Country code of the British Indian Ocean Territory | Country code of Anguilla |
| How people read it | The default address of a business | Input and output, software, developer tools | Artificial intelligence |
| Registry | Verisign | Identity Digital | Government of Anguilla, operated by Identity Digital |
| Registrations | 163.6 million (Q1 2026) | About 1.89 million (June 2026) | About 1.28 million (June 2026) |
| Wholesale fee | $10.26 a year, $10.97 from November 1, 2026 | $50 a year, $56 from January 19, 2027 | $160 per two year term since March 5, 2026 |
| Minimum term | One year | One year | Two years, on registration, renewal and transfer |
| Eligibility rules | None | None at the second level | None |
| Treated by Google as | Generic | Generic, not tied to a country | Generic, not tied to a country |
Retail prices sit above the wholesale fee and differ by registrar. In August 2026 ordinary .com renewals ran roughly $11 to $23 at US registrars, .io roughly $35 to $76, and .ai commonly $70 to $110 a year. The live price of each extension at NameBest is in the search result and on the pricing page.
What each extension costs over five years
The headline price is the wrong number to compare. What you pay over the life of the company is the renewal price times the years you keep the name, and the three extensions move very differently.
A .com is the cheapest to hold by a wide margin, and its increases are capped by contract at 7 percent in four years of every six year term. A .io costs four to six times as much, and its registry has raised prices three times in about fifteen months, with another rise confirmed for January 2027. A .ai costs the most and is always paid two years at a time, so the first invoice is for two years and so is every renewal after it. Over five years a .ai can cost more than ten times what the matching .com costs, before any increase.
None of that is a reason to avoid .io or .ai. It is a reason to put the five year number in your budget, not the first invoice. The article on domain renewal pricing explains why the renewal is the number that matters.
How customers and investors read each one
The .com still reads as the real address of a company, especially to non technical buyers, older customers and anyone who hears your name rather than clicks it. If people find you through word of mouth, radio, podcasts or a sales call, a non .com name will be followed by "dot com" in a share of their browsers, and that traffic lands wherever the .com points.
The .io reads as a developer tool. To engineers it is native and slightly old school, to consumers it can look like a typo. The .ai reads as an AI company, which is a strong signal while that is what you are, and a constraint if the product later becomes something else. Investors have seen funded companies on all three for years, and none of them will pass on a deal because of the extension. They may ask whether you own the .com, and having an answer helps.
Search engines do not care. Google treats .io and .ai as generic extensions rather than country targeted ones, and the extension is not a ranking factor. Whatever you pick, the work that decides your rankings is the same.
The country code risk in .io and .ai
A country code extension exists as long as the two letter code stays on the ISO 3166-1 list. That is why people ask whether .io could disappear.
For .io the question is live but slow. The United Kingdom and Mauritius signed a treaty on May 22, 2025 to transfer sovereignty over the Chagos Archipelago, and as of August 2026 it had not entered into force. Even then, IO would have to be removed from ISO 3166-1 and IANA would run a transition that its practice sets at five to ten years. The .su extension of the Soviet Union still resolves more than three decades after the country dissolved, and the retired .yu gave registrants years of notice. The article on .io domain meaning covers the full chain.
For .ai the risk is lower. Anguilla is a stable British Overseas Territory with no sovereignty dispute, and .ai registrations are a large share of its government income, so it has every reason to keep the registry running well. The article on the .ai domain country has the details.
The more practical country code risk is policy rather than geography. A country code registry sets its own rules on terms, pricing and disputes, and can change them without the ICANN process that governs .com. The two year .ai minimum is an example.
Which one should your startup pick
- Pick the .com if the exact name is free at the ordinary price. Stop reading and register it on the com domain registration page.
- Pick the .ai if you build an AI product, sell to people who already think in AI terms, and accept the two year term and the higher renewal. See ai domain for the rules.
- Pick the .io if you sell to developers or technical teams who read it as native. See io domain.
- Pick a different .com if your customers hear your name more than they click it. A small change, such as a short verb in front of the word, often beats a perfect word in a less familiar extension.
- If the .com is held and the owner wants a price, compare that price with five years of .ai or .io renewals plus the traffic you will lose. The guide to buying a taken domain covers how to approach the owner.
Defensive registrations worth making
Whatever you build on, register the other two if they are free and the name matters. A startup on .ai should own the .com if it can, because that is where mistyped traffic and misdirected email go. A startup on .com that works in AI may want the .ai before a competitor or a squatter takes it, especially before a public launch or funding announcement. Point the spare names at your main site with domain forwarding.
Stop at the names someone would plausibly use against you. The math on buying every extension shows why a wide defensive set costs more over ten years than it protects.
Questions about .ai, .io and .com
Is a .ai domain worth it if the .com is taken?
For an AI product sold to an audience that reads .ai as a category, usually yes. Budget for the two year minimum and the higher renewal, and register the .com later if it comes up for sale.
Is .io still a good choice in 2026?
For developer tools and technical products, yes. The country code risk is real but measured in years, and the main cost is the renewal price, which keeps rising.
Does a .ai or .io domain hurt SEO?
No. Google treats both as generic extensions and does not use the extension as a ranking factor.