The best replacement for ksp is solubility.

The best alternatives to ksp are rated as following:
★★★★★  solubility
★★★  keq
★★★  q
★★  k
★★  ka
★  kc
★  molar solubility
★  ionic strength
★  space engineers
★  orbiter
★  qsp

Your alternative for ksp is not listed? Suggest!
Speaking about ksp, one probably shouldn't forget about solubility.

Other search terms related to ksp and their ratings are:
★★★★★ solubility
★★★★ common ion effect
★★ molar solubility
★ concentration
You have in mind a companion for ksp and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ksp in all years. Click on graph for more.
ksp
solubility
keq