: Most commonly uses the LZMA or LZMA2 algorithms, which provide a significantly higher compression ratio than standard ZIP files.
The macOS Finder can often unpack these natively, but third-party tools like Commander One are required to create them or view contents without full extraction. : mna.7z
7-Zip is a file archiver with the highest compression ratio. The program supports 7z (that implements LZMA compression algorithm), Oracle Help Center How To Open .7z Files on Android : Most commonly uses the LZMA or LZMA2
ZArchiver is a common choice for mobile users to extract and view 7z archives. 7z - man pages section 1: User Commands mna.7z
Alternatively, WinZip and Trend Micro's Unzip One both support the 7z format. :