NPS
Net Promoter Score (NPS) is a widely used market research metric that typically takes the form of a single survey question asking respondents to rate the likelihood that they would recommend a company, product, or service to a friend or colleague.
Scores range from -100 to +100. * Promoters (9-10): Loyal enthusiasts. * Passives (7-8): Satisfied but unenthusiastic. * Detractors (0-6): Unhappy customers.