Limitations of the free version

Limitations of the free version

I recently signed up for the free version of Zoho Docs. All I want to do is to publish about a dozen of spreadsheets (templates for some standard calculations) that my web users will be able to use on the web in real time without modifying my original template spreadsheet.

This feature in not available in Google Docs: When I share a document in Google Docs, either it is read only (nobody can do modifications on the web page, he/she has to save the document somewhere to change some values), or it is writable (anybody can modify and ruin the contents of the original document). So, the option to make a document public to "external world" in Zoho Docs is exactly what I am looking for.

My question is: In the free version, is there any limit on the number of web sessions that simultaneously can access my public documents? Any limit on the number and size of the spreadsheets? Or any other limitations?