Reviewers mostly praise Untitled UI for its icon library, calling it clean, modern, polished, and easy to drop into minimalist design work. The most specific feedback says the icons feel pixel-perfect and save time because they need little or no tweaking, with users also highlighting the broad selection and overall visual quality. Feedback here is overwhelmingly positive but narrow: reviewers focus far more on the icons and design polish than on broader product use, and there is little substantive criticism or detailed discussion of drawbacks.