<![CDATA[The management of motor vehicle data, such as service history, fuel consumption, and tax administration, is still done manually in many workshops, which risks causing data loss, recording errors, and irregularities in vehicle maintenance monitoring. This condition indicates the need for a digital system that can help customers and workshop staff manage vehicle information in a more structured and easily accessible manner. This research aims to develop an Offline Vehicle Service Management Mobile Application as a digital solution to support vehicle data management at Adit Garage Workshop. The application development uses the Waterfall method within the Software Development Life Cycle (SDLC) framework, which includes the stages of requirements analysis, system design, implementation, and testing. The application is developed using the Flutter framework and designed to operate fully offline without relying on an API or backend server, so vehicle data can still be managed when an internet connection is not available. The main features developed include recording vehicle identities, digitizing service histories, recording fuel consumption, and reminders for vehicle tax and Vehicle Registration Certificate (STNK) expiration. The development results show that the application is capable of integrating various vehicle maintenance information into a simple and user-friendly mobile platform. Testing using the Black Box Testing method shows that all tested features can operate according to their designed functions without any functional errors found. The implementation of the application also provides ease in recording, searching, and monitoring vehicle information for both customers and workshop personnel. Thus, the developed application can serve as an efficient digital solution to support the management and monitoring of vehicle maintenance, especially in workshop environments that require a system capable of operating without an internet connection.]]>
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