The domain extension is part of the product signal. For technical products, three extensions come up often: .ai, .dev, and .io. Each one can work, but they communicate slightly different expectations.

The right choice depends on what you are building and who needs to trust it.

When .ai works best

.ai is strongest when the product is clearly related to artificial intelligence. It is direct, category-specific, and easy for buyers to understand.

Good fits include:

• AI agents
• LLM tools
• Model operations
• AI education
• Automation platforms
• AI research products

The advantage is clarity. The risk is that .ai can feel generic if the name itself does not carry enough brand personality.

When .dev works best

.dev is strong for developer-facing products. It can make a domain feel technical, practical, and documentation-friendly.

Good fits include:

• API portals
• SDKs
• Developer tools
• Documentation sites
• Open-source projects
• Platform engineering products

For companies selling to developers, .dev can be more precise than .ai because it tells the audience that the product is built for technical users.

When .io works best

.io still works well for SaaS and startup products. It is flexible, familiar, and not tied to one narrow category.

Good fits include:

• SaaS dashboards
• Data platforms
• Workflow tools
• Infrastructure products
• B2B software

The main benefit is flexibility. A .io name can survive product changes without feeling outdated.

Choose based on buyer expectation

The best extension is the one that reduces explanation. If buyers expect an AI product, .ai can help. If buyers expect developer tooling, .dev can help. If the product needs a broader startup feel, .io may be better.

You can compare real examples in this AI, .dev, and .io domain portfolio.