Mac LCV Database is a web based reference tool for identifying the last compatible versions of applications that run on legacy macOS systems. It provides records for final app versions and vendor support cutoffs, with each entry citing its source and the date the information was verified. The database does not host installers or provide download links; its purpose is to serve as a factual compatibility reference for users maintaining older Macs. To use the tool, a visitor selects a macOS version and then searches for a specific application. The full catalog contains 999 applications, while a featured section highlights a smaller set of curated records. Browsing is also available by app category or by specific legacy macOS system. Records are marked with supporting evidence, and if no entry exists for a given app, the database does not assume incompatibility. Instead, it simply indicates that no matching recorded entry is currently available. The database is maintained with a methodology that prioritizes vendor support documents, official release notes, and first party lifecycle announcements. A version or cutoff is only added when a cited source supports it. If an exact final build cannot be verified, the record is explicitly presented as a lifecycle cutoff rather than a guessed version number. Mac LCV Database is a free project from TRACER RECART, and it advises that compatibility information follows the cited sources, while legacy software may no longer receive security updates.