Choosing a domain extension is not just a technical decision. It affects how buyers interpret the product before they read the homepage.

For AI and developer products, four extensions matter most: .ai, .dev, .io, and .com.

.ai is the clearest category signal

.ai works best when artificial intelligence is central to the product. It is direct, easy to understand, and widely used by AI startups.

Good fits include:

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

The main risk is sameness. A .ai extension helps with category clarity, but the name itself still needs personality.

.dev is strongest for developer products

.dev works well when the audience is technical. It naturally fits documentation, SDKs, APIs, developer portals, and engineering tools.

Good fits include:

• API platforms
• Developer tooling
• Open-source projects
• Infrastructure docs
• Platform engineering products

If the buyer is a developer, .dev can be more precise than .ai.

.io remains flexible for SaaS

.io is still familiar in startup and software markets. It works well when the product may expand beyond one technical category.

Good fits include:

• SaaS dashboards
• Workflow tools
• Data platforms
• Infrastructure products
• Internal tools

The benefit is flexibility. The risk is that it may not signal AI as strongly as .ai.

.com is still the trust default

.com remains the broadest and most familiar extension. But strong .com names are often expensive or unavailable. For early AI products, .ai, .dev, and .io can be more practical.

The best extension is the one that helps the buyer understand the product faster. Compare examples in this technical domain portfolio before choosing.