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Dear Customer, Thank you for your interest in the GOOLOO DS100 OBD2 Scanner. Yes, the DS100 requires our free mobile app, which you can download from the official app store for iOS or Android. Or refer to the instruction manual for the download link. In addition, the full features of the DS100 (including all-system diagnosis and 6 maintenance functions) require an active subscription. Please refer to the product packaging or the app for detailed subscription plans and pricing. If you have any further questions, feel free to contact us. Best regards,
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