Polaris Viewer Plus vs Universal File Opener

Polaris Viewer Plus is a document viewer for viewing and annotating original files across Android, iOS, macOS, web, and Windows. It offers pen-writing tools and tabbed viewing for keeping several documents open and switching between them. Listed formats include Word, Excel, PowerPoint, PDF, HWP, and PNG; additional template, macro, image, CSV, and text formats are supported for viewing only. The product lists Excel filters, slide notes, and bookmarks, and Palm Rejection separates pen from touch input. Its product page says document data is managed in volatile memory to prevent leakage. Viewer Plus is installed on the client and does not require an extra conversion server. It is described as compatible with groupware, electronic document management systems, and DRM solutions. Storage integration and logo insertion are available for workspace customization. Mobile requirements are iOS 15.0 or later and Android 10 or later. The page directs prospective customers to contact sales; no price is listed.

Universal File Opener is an offline viewer and editor for supported files on Android and Windows. Its tools cover PDFs, Office documents, spreadsheets, presentations, images, archives, text, code, data, audio, and video, with available capabilities varying by platform and format. The listing includes 214 formats, archive, Office, and code previews, and in-file search. Reading supported files is free without a file-count limit, expiry, or watermark, though individual formats have size and compatibility limits. Files are processed on the device: Android does not request INTERNET permission, and the Windows app makes no network connections of its own. The apps have no advertising, app analytics, or Krauq account requirement. Android can read English text from scans using offline OCR. Files can be opened through Android sharing or file-picker features, or Windows dialogs and drag and drop; cloud providers handle their own downloads and syncing. Android Pro costs $1.99 a month or $9.99 a year. The listed lifetime option costs $5,029.99, paid once.