There are several websites and tools available that offer free inspection of APK files or APK analysis to detect if they are safe or to identify the contents/components within them. Here are some popular options:
1. VirusTotal: VirusTotal is a widely used online service that analyzes files and URLs for malware detection. You can upload an APK file to VirusTotal, and it will scan the file using multiple antivirus engines to check for any potential threats.
2. Jotti's Malware Scan: Jotti's Malware Scan is another online service that allows you to upload files for scanning by multiple antivirus programs.
3. AndroGuard: AndroGuard is an open-source APK analysis tool that can help you analyze Android applications. It provides detailed information about the components and permissions used by the APK.
4. APKTool: APKTool is a tool that allows you to decompile and analyze APK files. It can help you to extract the contents of an APK file and view the resources, manifest file, and more.
5. Koodous: Koodous is a community-driven platform for Android malware analysis. It allows users to submit APK files for analysis and provides detailed reports on the file's behavior and potential risks.
By using these tools and services, you can inspect APK files to determine their safety and identify the contents and components they contain. Remember that it's always good practice to exercise caution when downloading and installing APK files from sources other than official app stores to avoid potential security risks.