The evaluation version of Aspose.Cells (that is, Aspose.Cells without a license applied) provides most of the product functionality. One limitation is that it always injects an extra worksheet with evaluation watermark on open / save any spreadsheet document.
Figure: Demo Spreadsheet created by Aspose.Cells component
Figure: Evaluation Warning – An Extra Worksheet
If you want to test Aspose.Cells without evaluation version limitations, you may request a 30-day temporary license.