Capability 2 — interactive functionality: the visitor supplies input and the site returns a computed or looked-up result (calculator, quote, search, booking, configurator)

Capability: A feature where the visitor supplies input and the site returns a computed or looked-up result — a calculator, a quote / estimate tool, a search box, a booking flow, a configurator.

The defining test: the output depends on what the user entered. (A static page that says "call us" doesn't qualify; a quote form that returns a price range based on inputs does.)

Source: Industry-consensus definitional framing.

Confidence: Industry-consensus (definitional).

Caveat — evidence base for outcomes is thin: unlike capability #1, no clean current primary dataset ties interactive features specifically (calculators, booking, account state) to conversion or retention for general SMB marketing websites (GAP — no clean, current, primary dataset ties interactive features (calculators, booking, account state) specifically to conversion / retention for general SMB marketing websites). Available figures are vendor-sourced and frequently recycle the quarantined Mediafly stat (QUARANTINE — "Interactive content drives 52.6% more engagement / 13 min vs 8.5 min" traces to a single Mediafly press release 2022; B2B sales-enablement decks, NOT marketing-website visitors). The argument rests on definitional / mechanism grounds, not strong outcome data.

Business types most served: trades (booking + availability), consultancies (calculator / assessment), retailers (configurator), any service where the answer "what will this cost me?" is non-trivial.

Why this matters for Candid: Commodity parts now make this capability buildable at SMB scale — see the companion falling-cost-floor brief Research brief: the falling cost floor of "real" web functionality for SMBs (June 2026).