Hello,
Let me show you my new application : "Auto SMS Reply".
It is available for free on Google Play Store.
On your mobile, type in the search text box of the Google Play Store: devncow SMS
(Sorry, I can not post link to my app for the moment, as I am a new user of this forum. You can use also the QR code I provide in a screenshot below in this post, if you are interested by this app)
"Auto SMS Reply" is your new personnal assistant : it replies (SMS) for you when you are busy or when you do not want to answer.
If you are driving, reading, sleeping, watching a movie, in meeting or simply if you do not want to be disturbed, "Auto SMS Reply" will reply incoming calls / SMS by sending an Auto SMS (ie. an automatic SMS reply).
Up to you to decide when activate and to whom replying an Auto SMS.
You have just to add a new Auto SMS in the "Auto SMS Reply" application and configure parameters fiting your needs !
Obviously, you can add and activate as many Auto SMS as you wish.
"Auto SMS Reply" is very convenient to reply SMS depending on who is calling / sending an SMS.
For instance, you are not available because currently driving you can activate a specific answer for your wife / husband and a different response for your boss.
"Auto SMS Reply" uses a nice and fluid interface based on the Material Design.
Please try "Auto SMS Reply" and give me feedbacks or new ideas for next versions.
Please note "Auto SMS Reply" and add a review if you like it 
.
Regards,
!