The .io profile
Short technical terms, developer tooling and software brands can fit .io naturally. Buyer depth falls quickly outside technology-adjacent categories, so a strong word does not guarantee a broad market.
Use extension-specific evidence
Use current sales from similar technical categories and keep renewal cost in the investment model.
Run the domain through the same framework
Extension quality is one factor among naming power, clarity, commercial intent, scarcity, build potential, liquidity and buyer depth.