The number frequently appears in technical manuals and professional "papers" as a section header rather than a software version:
: These are popular storage cleanup apps for mobile devices. Cleaner-App Pro 8.2.3
: Security experts and community members on platforms like Reddit often warn that "cleaner" apps may be unnecessary, as modern operating systems handle cache management automatically. Some third-party cleaners may even slow down devices or serve excessive ads. Technical Reference 8.2.3 The number frequently appears in technical manuals and
: The Cleaner Pro app on the Apple App Store focuses on merging duplicate contacts and managing storage by identifying large files or similar photos. Technical Reference 8
If you are looking for a research paper regarding "cleaner" technologies, "useful paper" might be a literal description of a document such as:
: CleanPro and ProCleaner perform similar tasks, such as removing junk files and clearing cache.