User-Friendly App for Nut and Bolt Sizing

I’m looking for an experienced app developer to create a simple, user-friendly app designed for DIY enthusiasts. The app's primary function is to scan a nut or bolt and provide the following information: - The size of the nut or bolt - The correct spanner size to use - The compatible thread size for the nut The goal is to start with a basic version of the app, with potential expansion in the future to include features similar to Digital Vernier Calipers, such as: - Measuring range: 0 ~ 150mm - Measuring inside dimensions with graduations of 0.01 mm / 0.0005″ Key Requirements: The app will need a backend database that includes: - A comprehensive list of standard nut and bolt sizes (dimensions, thread types). - Matching spanner sizes for each nut/bolt size. - Thread compatibility data (e.g., which nuts fit which bolts). If you have access to charts or guides showing these relationships, please share them. Otherwise, I’m open to suggestions on how this data can be sourced or structured. Ideal Skills and Experience: - Experience in mobile app development (iOS and Android) - Familiarity with mechanical concepts and tools like nuts, bolts, and spanners - Strong knowledge of image recognition or scanning technology Budget: Since this is an initial version, I’m working with a limited budget but open to discussing options.