Summary: Develop an app for Android and iOS systems. It does not need to be listed on the App Store, but the app must include the following features: 1. Functionality is exactly the same as similar apps I've uploaded. 2. A management backend with editing, composing, and deleting functions, and a fixed authorization access code. 3. Provide excellent after-sales service to resolve any issues encountered. 4. The app icon and name can be customized. 5. I will test the app after development is complete. 6. After successful testing, a fixed monthly maintenance fee will be required. 7. My English is not very good, but I speak Chinese. I need a patient communicator; I am proficient in translation software. 8. Looking forward to contacting you. Deliverables: Detailed Description: Please refer to the uploaded images. Figure 1: After the software download is complete, location information needs to be obtained. This information can be viewed in the software backend after user authorization. Figure 2: After user authorization, account registration is required. Figure 3: The user registration interface only requires a mobile phone number and password. Username and password are automatically saved; the user is returned to the login screen. Figure 4: After returning to the login screen, the user logs in. Figure 5: The software prompts the user to enter an access code (authorization code). Access codes (authorization codes) can be set (added or deleted) in the software's management backend. Access will not be possible without an authorization code. Figure 6: After the user enters the correct access code (authorization code), authorization is successful. Figure 7: The icons for each function in the software are consistent with the icons of the corresponding software and have the same function. Figure 8: Function operation interface. Figure 9: A reminder to contact software customer service for assistance. Figure 10: Please refer to the download code for the corresponding software.