i would say HIGHLY not FOSS. In fact their website has a wonderful disclaimer :
If Kcalculate provides the code along with the software it's FOSS alright. Freedom to change code, need not be to distribute.
Mate, READ the disclaimer they have written on their website before quickly defending them and quoting FOSS philosophy.
For your benefit i'll quote it once again.
``KalCulate is sold to its customer for their use as per the policy of each version. This sale does not transfer the rights to\ software and/or its code in any way to the user under any circumstances whatsoever.
With the use of KalCulate, we are givin\g a facility of accounting and inventory management and other features of the software and we are in no way responsible for \any data-loss or consequential lossess or any other losses, if any suffered by anyone whosoever."
If you can please show me a link where ``Kcalculate provides the code along with the software" and has a FOSS based license i will agree it is FOSS.
In fact a few google searches will tell you people criticizing the app for not being FOSS/FLOSS :-) compatible.
Regards,
- vihan