Compare .io and .ai

These two extensions are often treated as interchangeable because both look technical. They are not. The audience reads them differently, and the registry rules differ in ways that affect the first payment and the renewal.

The short answer

If the product is software, an API or a developer tool, .io is the more natural signal. It says technical product without claiming to be an AI company.

If the product, service or research is genuinely about artificial intelligence, .ai tells the audience what they need to know before the page loads.

If AI is only a feature inside a broader product, .io or .com is usually the better fit. An .ai address that overpromises invites the wrong questions.

Side by side

Where .io wins

• Software convention. Developers already read .io as a product, API or tool.
• One-year option. .io allows 1 to 10 year terms, so the first commitment can be shorter.
• Internationalised names. .io supports them; .ai does not.
• Wider than AI. It does not force every product conversation to be about artificial intelligence.
• Established signal. The developer convention has been stable for years.

The advantage is precision. If the product is software but not AI, .io says that more honestly than .ai.

Where .ai wins

• Clear category. Visitors know the offer is about artificial intelligence before they read the headline.
• AI-native products. A model, an agent, a research tool or an AI service fits the extension naturally.
• Partner expectations. Investors, integrators and AI buyers look for the signal.
• Availability. A strong name that is taken on .com may be free on .ai.
• Premium perception. The extension is associated with a high-value category, even when the site is small.

The advantage is category clarity. It is not proof of capability, and an .ai address cannot make a non-AI product into an AI business.

Cost and renewal

.ai registrations and renewals run in 2, 4, 6, 8 or 10 year blocks. There is no single-year option, so the first payment covers at least two years. .io allows 1 to 10 year terms.

This page does not quote a number. The search result and the checkout page show the current prices for the exact name, including whether it is a standard registration or a premium listing.

Both extensions can carry higher renewals than .com. Check the renewal price and the term before you commit, and remember that buying both means two renewals.

Rules and restrictions

Both extensions are open to anyone. .io supports 1 to 10 year terms, 1 to 63 character names and internationalised domain names. .ai supports 2, 4, 6, 8 or 10 year terms and does not support internationalised names.

Both park the domain after a failed billing attempt and cancel it if it is not renewed within 40 days after expiration. Domain privacy is supported on both. DNSSEC is supported on .io but not on .ai. Timelines can change.

Read the current registry summaries for .io and .ai before you rely on a specific rule.

How to choose in five minutes

1. Decide whether AI is the product or a feature inside a broader product.
2. If AI is the product, check the .ai name and confirm you can commit to at least two years.
3. If the product is software but not AI, check .io first.
4. Look at both results and read whether either is a premium listing.
5. If the name is taken on one extension, do not assume the other is available.
6. Buy both only when the brand is established enough to defend the pair.

Common mistakes

• Using .ai for a product that only has an AI feature.
• Assuming .io stands for artificial intelligence. It does not.
• Forgetting that .ai has a two-year minimum term.
• Planning an internationalised name on .ai, which does not support one.
• Buying .ai because it sounds current, without a product that justifies it.
• Ignoring the renewal price on either extension.

Frequently asked questions

Last reviewed: 2026-10-19. This page describes current practice and general information. Prices and registry policies can change.