Give two thumbnail ideas room to compete in a fold-aware comparison notebook.
ThumbnailDuel is a tool that lets creators import two thumbnail images (up to 40 MB) via Photos or Files, downsampled to a maximum long edge of 1600 pixels, and compare them using size presets for home, search, related, mobile, and dark themes at 100%, 75%, and 50%. Images are displayed vertically on standard non‑folding devices and can be reordered with a single tap. Users mark text readability as “readable” or “difficult”, rate clarity and impact with star ratings (1–5), record reasons, and manually enter results such as CTR. Projects are listed, and the selected two‑candidate comparison image can be exported. Requires iOS 17 or later. The interface is currently Japanese. No in-app purchases. Exported images can be shared manually to chosen destinations. No CTR prediction, automatic platform data retrieval or video-platform upload is included.