SafeCheck is a security scanning tool that checks applications for leaked API keys, open databases, exposed configuration files, and missing security protections. The scanner is designed for applications built with rapid development methods, including AI-assisted coding tools, where secrets and misconfigurations may be inadvertently included in shipped code. It identifies these issues so they can be addressed before attackers find and exploit them. The scanner accepts three input types: a live application URL, a GitHub repository link, or an uploaded Android app file in .apk or .aab format. For website scans, it examines what a visitor's browser would see. For GitHub scans, it reviews files and recent commits in the repository. For Android scans, it unpacks the file in the browser and inspects it for leaked keys, debug builds, unencrypted traffic, and Firebase settings. GitHub access is read-only and can be revoked at any time. The tool only reads publicly visible information and does not log in, write data, or modify anything. SafeCheck checks for four categories of issues: secret keys in frontend code, repositories including old commits, and Android apps; databases that respond to unauthenticated requests, such as Supabase tables without row-level security or Firebase in test mode; accidentally deployed config and source files that can be downloaded; and missing browser protections that make injected code and clickjacking easier. The report includes a security grade from A to F, a count of problems by severity level, the location of each problem, and plain-English remediation steps. A free scan provides this summary of findings. A paid scan, unlocked with a single payment per scan, adds partially masked leaked key values for identification, ready-to-paste fix code, a one-page PDF report for sharing with a team, and a deeper database check that is available after users verify ownership of the scanned application. Typical users are developers who want to check an application before launch or after adopting AI-assisted development workflows. Leaked keys can be revoked or rotated with the provider, and the full report includes specific remediation steps for each provider. iOS, desktop, and Linux applications can be scanned through their GitHub repositories, since leaked keys and open database configurations live in source code regardless of the platform the code ships to. Users are advised to scan only applications they own.