B1 Archiver vs NanaZip

B1 Free Archiver creates and extracts archives, with desktop software, an Android app and an online archiver. The desktop application creates B1 and ZIP archives and supports almost 40 formats, including RAR, RAR5 and 7z. The online tool extracts files from B1, ZIP, RAR, 7z and other archive types. On Android, B1 also works as a file manager. The B1 format supports password protection using 256-bit AES encryption, and the desktop archiver checks archive integrity with Adler-32 before unpacking. B1 says files uploaded to its online archiver are deleted a few minutes after the page is closed. Its privacy policy says it does not knowingly collect identifying personal data, though it may collect non-personally identifiable server information such as IP address and browser type. The policy also says app and device usage data, including location and network performance, may be collected for anonymous ad-related use in B1 apps. Support is by email and in English only. B1 is free for personal and commercial use, with no registration.

NanaZip is a free, open-source file archiver derived from 7-Zip and built for Windows. Its modern MSIX version connects with File Explorer context menus and file associations, while the interface supports Windows 11 context menus, Fluent Design, Mica material, and dark mode. Smart Extraction treats archives with one root item differently from those with several root items to keep extracted files organized. The maker lists formats and codecs including Zstandard, WASM, Electron ASAR, .NET Single File bundles, Brotli, and LZ4. Additional hashes include SHA-256, SHA-512, BLAKE2b, and XXH3. Command-line tools and a 7-Zip execution alias are included. Listed protections include package integrity checks, Control Flow Guard, Shadow Stack compatibility, limits on dynamic code generation, and blocking unexpected remote libraries. It supports Windows 10 version 2004 or later and Windows Server 2022 or later on x64 and ARM64.