This app was mentioned in 6 comments, with an average of 2.17 upvotes
As others have said, no SMS fallback. Your best alternative would probably be INVI messages. But as with every chat app you would need to have people install INVI to have that non sms communication which tends to be a lot of work. I have not used INVI. My friends actually chose Allo over other messaging apps.
Definitely invi. Although its relatively new the developers are super active and improving it with every update. It also has an automatic IM feature which activates when chatting with another invi user. Theres also a feature that provides emojis, stickers, images, and gifs in relation to what you type. definitely check it out.
Currently using invi sms found here it's a pretty good replacement for the stock one. Also supports link preview which is a plus for me. Mood messenger Mood is pretty good too.
Sorry, click this link and let us know if you are able to download:https://play.google.com/store/apps/details?id=com.invi
Link? Can't find it on the Play Store.
Edit: Never mind, found it: https://play.google.com/store/apps/details?id=com.invi
It's not available in Germany though.