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This paper examines the propensity of a market to correct its negative externalities when consumers are informed about them thanks to digital “judgment devices” (Karpik 1989). The paper is based on the case study of decoding apps for cosmetic products. We first show that these digital devices distinguish themselves from traditional prescribers because of their informational efficiency. We then relate how the beauty industry takes part in conflicting strategies of adaptation and opposition to these apps.