product_searches > app_search

A LOT of software calculators out there are button-oriented (AKA immediate execution), which seems kind of silly, since that constraint is a holdover from hardware calculators.

Expression-calculators seem much better. Even better are expression-calculators that allow you to scroll back through history.

These need not be as heavyweight as CAS systems. CAS are very powerful, but aren't remotely lightweight.


Are available on the web