Obsidian vs UPX

Obsidian is a note-taking app for keeping thoughts in linked notes. It saves notes as plain-text Markdown files on your device, where they remain accessible offline. Its Graph view shows relationships formed by internal links, and Canvas provides an open space to arrange notes alongside attachments and web pages. The app includes core plugins and supports community plugins, themes, and an open API for customization. The Web Clipper is available for Chrome, Safari, Firefox, Edge, Brave, Arc, Orion, and Vivaldi. Obsidian has a free plan at free, with no sign-up required. Optional Sync plans cost $5 a month for Sync Standard or $10 a month for Sync Plus; their storage and file-size limits differ. Publish costs $10 a month and hosts a site up to 4GB. Obsidian says Sync uses AES-256 end-to-end encryption, and its security page lists third-party audits. Listed platforms include Android, iOS, Linux, macOS, and Windows, plus extension support.

UPX is a portable executable packer and file compressor for Windows, macOS, and Linux. It works with executable formats including Windows programs and DLLs, macOS apps, and Linux executables; listed formats also include PE, ELF, Mach-O, COFF, DOS, and Atari/TOS. The project says compression commonly reduces program and DLL sizes by around 50%–70%. For most supported formats, compressed programs are self-contained and run as before without runtime or memory penalties. UPX can list, test, and unpack executables, and maintains checksums for compressed and uncompressed files. It is free software under GPL v2 or later, with a special exception allowing unmodified UPX to compress commercial programs. UPX does not add protection or encryption, and the project advises handling only trusted files. Linux users should account for documented tradeoffs: compressed executables may require more RAM or swap when multiple processes run, and the generic Linux format recreates the original file in /tmp before launch.