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Touchscreen devices (e.g., smartphones, tablets) are a major means of accessing digital resources. However, touchscreen accessibility remains a challenge for users with visual impairments. Mainstream solutions implicitly favor a sequential navigation of digital information. This precludes users from enjoying the advantages of well laid-out, visually-structured documents, especially for certain tasks (e.g., text navigation). In this paper, we introduce tactile sheets---engraved paper sheets that represent the layout of a specific page and that are used as an overlay on a capacitive touchscreen device. Via engraved tactile patterns and textures, users can locate and discriminate different content areas, navigate the spatially-distributed content non-sequentially and access speech feedback with gestures. We report a comparative study with nine visually-impaired users that investigates the technical feasibility and the …