Generally both software are HP-GL, HP-GL/2 and HP-RTL viewers and converters. Both are based on the same HPGL, HP-GL/2 and HP-RTL engine. However the SPLOT software is a standalone application, whereas WEBPlotter software is a server application.

A server application is not a standalone executable, it can run only under some client application (for example a web browser) and it has form of a dynamic-link library. The client application is responsible for the data management (file opening, data delivery etc.), it defines size and position of the server application's window etc. By other words the client application defines a framework of the subordinate server application and controls it. Because of this, the functionality of the server application is limited by the client application.

The purpose of the server application is to provide some functionality to the client application, which the client application has not. In case of the WEBPlotter, the main purpose is to provide possiblity to view plot files embedded into html code. Although WEBPlotter enables to view plot files under web browser also in so called full window mode (file is not embedded into html code), for a standalone plot file viewing, conversion and manipulation is always better to use SPLOT. By other words, if you don't need to embed plot files into html code, then using SPLOT is much more comfortable and efficient way than using WEBPlotter.

The SPLOT program has these main features, which WEBPlotter has not:

Emebedded file explorer for comfortable plot file access

Batch support

Send and e-mail functions

Support for ZIP archives and SPLOT archives

Ruler

Measurement

Full PDF support - direct PDF export and integrated PDF viewer with markup tool

As usual, the evaluation period is 30 days. However I understand that sometimes it is hard to evaluate the software within 30 days (the user has also another work than evaluate one piece of the software). So the real period, for which is the evaluation copy functional, is 60 days.

Yes, it can be prolonged by installing a newer version. However this applies only to expired or nearly expired period and the added time varies from 10 to max. 30 days.

Yes, the evaluation version is fully functional.
The only limitations are:

Evaluation period.

Evaluation watermark in the possible output (print and conversion).

For the SPLOT software the additional evaluation limitations are:

Some batch operations have count limit (maximum is 5 processed files in one batch run).

The evaluation version of SPLOT cannot create shareable SPLOT archives, it can create only trial SPLOT archives.

The Print function serves for printing to any printer properly installed in Windows. The printer can be a physical output device (e.g. real printer, plotter, fax machine etc.) or a virtual device (e.g. PDF driver). In Windows system the printer is represented by a printer driver (a dynamic-link library installed in Windows). The printer driver is usually provided by the printer manufacturer (in case of a physical device).

The Export function converts the input plot file (in HPGL, HPGL/2 or HP-RTL format) to a selected output format (for example PDF). Unlike the Print function the conversion is done directly by SPLOT or WEBPlotter (i.e. not by an external driver as the Print function does). The output is always saved to a disk file.

The Send to function sends (copies) the selected plot file in unmodified form (as it is) to a selected device (e.g. printer or plotter) or port (e.g. LPT, COM). Unlike the Print or Export function there is no conversion or modification, so the output device must be able to process the format of the received file (usually HPGL, HPGL/2 or HP-RTL). The Send function is not available in SPLOT LITE and WEBPlotter.

Notice:
Some users are using the 'plot' word when writing to me. For example "When I plotted the file...". However in such case I don't know what you really do. To help you, I always need to know what exact function (and with what parameters) you used.

In the Print dialog check the Scaling button and set the scale factor to 100%. Similary the 50% scale factor means 1:2 scaling, the 200% scale factor menas 2:1 scaling etc. Please note that if you print with scaling turned on, then the target paper size must be large enough to hold the scaled image.