セルロイド, a multi-functional spreadsheet app, offers a wide range of features for easy numerical and symbol input. It allows simple input through tap cell references, frequently used word list input, and basic functions like copy, paste, undo, redo, and matrix insertion/deletion. Users can customize cell formatting such as font, size, color, background, title, header, border, and more. Additionally, it supports conditional cell settings for changing text color based on cell values.

The app also includes functionalities like search, sort (sort), autofill, graph display, map search, route search, data calendar display, memory card, one-touch time input, landscape display, and clear indexing for easy reference in headers.