Some questions:
1. Is commercial pricing (USD 199) per developer or per application?
2. Is there a different license needed for SaaS products? handsontable needs something like that.
3. `fast-formula-parser` looks great. How do you plan to handle writing complex formulas on the front-end?
1. Commercial pricing is per developer. Otherwise it can be misused
2. No
3. Formula parsing module that I am building is capable of running in a Web Worker or in the same UI thread. For lag-free calculations, Web Worker is preferred.
Basically Calculations are async. The calc engine can also reside in your own server (future :P)
`fast-formula-parser` does support adding custom formulas, So i think you will have control over it.