That’s why it is futile to try to do an app for pairing audiophile equipment, not so much of a problem for professional equipment.
You dont need an app. Most speakers are between 4-8 ohms. The power of the amp can be as high as you like provided you dont abuse it. The power can also be lower than what the speaker needs if you dont listen loudly. So as you can see the requirements for matching are not hard to achieve.
As for the sound quality, this is not something which can be matched other than using trial and error because nobody knows why amplifiers and speakers sound the way they do.