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FastStone Image Viewer vs qView: catalog facts
FastStone Image Viewer	qView
Free Free for personal use. Commercial use requires a paid licence, and the related FastStone…	Free Free and open source under the GPL.
Windows	Windows, macOS, Linux
Handles every common format including HEIC, WebP, PSD, PDF and camera raw Browser, viewer, basic editor and batch converter in one small program	Opens essentially instantly, which is what a double-clicked image needs No interface chrome; the window is the image
Free for personal use only; commercial use requires a licence Windows only	No editing, tagging or library management at all Metadata display is minimal
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.