In our defense I can tell you that SoapMaker is not just a
lye calculator. It also contains an extensive costing and inventory control system, which really comes in handy at tax time each year.
but most of all: we stand behind our product. You know who we are, you can reach us. We talk to users daily. We also created a users forum where you can talk with other SoapMaker owners. Many of them have thought of unique ways to use the program, which even we hadn't thought of!
Why it's not free: Not only the first version, but also the updated version of it took my hubby many many programming hours, days, weeks, months... to create, and SoapMaker 3 includes all the features which customers requested after using the first one for a few years. We have been told by many programmers that as a software program, it is worth much more than what we are asking for it.
As for SAP values and the differences between numbers on the different
lye calculators out there, remember that the numbers have to be approximate. Even if your oils supplier is extremely honest with you and gives you exact numbers (if he even knows them - heck, even the oil manufacturers themselves can't be that exact).
It even depends on the plants themselves, from which the oils were extracted: what kind of soil they were grown in, whether the season was dry or wet, how strong the initial seed or vine was.....etc. etc. etc.
Soapmaking is as much an art as a science. What I like most about using Soapmaker, besides its ease of usage, is that I can so easily compare one recipe with another. Once you have a recipe that you've made....you can see what numbers show up for that particular soap batch. If you like the soap, find other recipes that give those same numbers. It's so easy to create new recipes instantly, and see how they compare with one another on the graph. Play, have fun!
We created this program for people who don't like to do math, and would rather be making soap, wrapping soap, selling soap, planning their next batches, keeping on top of wholesalers, keeping in touch with customers etc....!
but if you like to do your own math, kudos to you!