New version supports data validation in cells. It allows you to define the cell type and use its parameters to validate entered values. Supported cell types include: number, email, positive, or not empty. When a user types an incorrect value into a cell, a red triangle appears in the upper-right corner of the cell, indicating that the value should be corrected.
We have added the ability to lock cells to prevent them from being changed. You can easily lock/unlock individual cells using the context menu.