Feel free to browse the site to see what tools are available. There are, currently, three websites under the same tools banner, with different sets of online analysis features. All tools are free to use, however there are restrictions on saving design data, for un-registered users; all data is regarded as volatile, where as registered users can use th data base to store one design and sponsored users("clients") have access to more permanent space and the FEM analysis section.
There is an exception for filter designers, it is possible save a single design for up to 24hrs, so repeat analysis perfection can be carried out in that period. However, thie space allocated for this function is limited and will be allocated on a first come, first served basis ie: a design could be ersed before the nominal 24hrs.
Sponsorship welcomed from component manufactures etc.