Diary / Job Apps

[DJ85]

I run a small business with my wife but sometimes she will quote jobs and sometimes I will, were starting to get to the point where we are accidently double booking customers or missing jobs till the last minute then need to try fit them in.
We both have diary's and usually go through them all the time but with getting so busy it take up a lot of time constantly comparing. Are there any apps we could use a diary where we can both have it on our phones ( android and apple) update it throughout the week and both be able to log on and see any live changes?

So say my wife books a job in for the Monday and I'm looking I can see that the day is taken already.

Thanks in advance

 

[DJ85]

I've looked into all above options and gave them a little test, looks like Google calender would work the best for us thanks. Updates instantly between devices. Just need to figure out if there are anyway to change the look of it