AutoTonic player is built on the patented AutoTonic keyswitch technology. It is also available in the full version. However, it offers a unique custom-designed and carefully planned "preset bank" (think of it as a modal mapping library) of many famous and custom-made scales. AutoTonic Player is also more fun to use because it uses emojis rather than scale names. This is not a demo, and it will not expire.
By 'playing only on white keys' and loading new mappings by the use of your black keys you have full control over new tonic/scale-combinations and simply can enjoy the full power of modal transposing (which allows 'scales with any count of intervals per octave'):
AutoTonic's full version is available as a subscription or as a perpetual licence. Pricing information is available.