D7 suits quick keyword/location searches. SphereScout suits repeatable market segments where the buyer needs clear segment size, coverage, and refresh history.
D7 Lead Finder sells simplicity: type a keyword and a location, get a lead list. The usage model underneath is less simple: plans are built around daily searches, estimated daily leads, list sizes, feature access such as bulk search/API, and output controls for which fields appear in exports.
D7 also offers useful filters for hiding leads without email, phone, website, or address. The difference is depth and repeatability: SphereScout is built around maintained country/category/profession segments, email-coverage previews, public per-country refresh dates, subscription credits, and one-off top-ups when a campaign needs more volume.