ImageGlass vs MuPDF

ImageGlass is a desktop image viewer for browsing and viewing image files on Windows, macOS, and Linux. It supports more than 90 formats, including WEBP, GIF, SVG, PNG, JXL, HEIC, and RAW. Viewing tools include slideshows, thumbnails, color picking, hardware-accelerated rendering, and EXIF information through ExifGlass. Built-in edits cover rotation, flipping, cropping, lossless compression, and resizing. Pro adds an HDR Tone Mapper, free and margin panning, File Watcher, custom mouse clicks, and settings and feature locks. The app can associate external editing apps, use custom hotkeys with them, and accept extensions built with its SDK. ImageGlass says it does not scan image libraries for analytics or send images, filenames, or folder paths elsewhere. Classic is free. Pro Individual is $14.90, paid once purchase; Pro Team is $69, paid once purchase. Pro Business is $9,917 a year. The 14-day Business trial requires no account, online activation, or device lock for local license verification.

MuPDF is an embeddable SDK for developers working with PDFs and other document formats in desktop, cloud/server, or embedded projects. It supports viewing, editing, extracting, signing, rendering, redacting, annotating, splitting, merging, compressing, and converting documents. Listed inputs include PDF, ePUB, image formats, SVG, CBZ, and XPS; outputs include PDF, text, HTML, PostScript, print formats, PNG, SVG, and PNM/PAM. Developer bindings include MuPDF Core, PyMuPDF, MuPDF.js, and MuPDF.NET. The open-source release is AGPL-licensed, and embedding it in a product may require a commercial license. For server-based use of the open-source software, the licensing terms require disclosure of application source code to users interacting with it. Commercial licenses provide an alternative without AGPL code disclosure and include technical support and free upgrades. The Commercial plan is listed at $299 a month and includes one licensed domain and one preview domain for testing; a 14-day trial is also listed. Open-source users can seek community help through Discord and the bug tracker.