Nitpick: your site has some annoyances in a mobile browser. Clicking links seems to drop me at the bottom of the new page instead of scrolling to the top. Some elements render off screen, and in particular the text formatting inside the live demo is very bad. On the projects page, I get a column of text about 6 characters wide, and some button labels seem to be missing.
Otherwise, this looks like something I desperately need at work. I'm particularly excited about the barcode scanning. Inputting stock is the hardest part about using a system like this, and this is an elegant solution.
The user count is a lot lower than I'd have thought. I work for a startup, and we have two engineers, two assembly techs, two purchasing managers, and several other people who would need read access. That's already more than your largest package. I don't understand why the limits are so low unless you're expecting people to have shared accounts like 'engineering', 'production', and 'purchasing'.
I'll have to give this a try sometime! It sounds super promising