AutoTonic Player is based on the patented AutoTonic keyswitch technology, available in the full version, but offers you a unique custom and carefully planned 'preset bank' (think of it in terms of a 'sound library' for the modal mapping technology) of various famous and custom made scales. Also, it uses emojis instead of scale names, which make AutoTonic Player even more exciting to use. Also, this is not a demo and will not expire or such.
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'):
The full version of AutoTonic is available both as a subscription and as a perpetual license. Pricing information can be found here.