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Lyn vs FastStone Image Viewer: catalog facts
Lyn	FastStone Image Viewer
Paid Paid app with a fully featured 15-day free trial.	Free Free for personal use. Commercial use requires a paid licence, and the related FastStone…
macOS	Windows
Reads RAW, HDR and all formats macOS supports Non-destructive editing with curves and levels	Handles every common format including HEIC, WebP, PSD, PDF and camera raw Browser, viewer, basic editor and batch converter in one small program
macOS only Paid after the 15-day trial	Free for personal use only; commercial use requires a licence Windows only
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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