Looking for a free Android "intercom app" that allows me to speak out of my wife’s phone without having to call her. I mean "any time", "any place".
Bonus points if there is a Windows version I can use on my Windows tablet.
Software Recommendations Stack Exchange is a question and answer site for people seeking specific software recommendations. It only takes a minute to sign up.Sign up to join this community
I recommend Voxer.
Voxer allows you to send voice messages to each other. As long as you both have the app open, no action is needed to hear the other person.
The free version even includes a "push to talk" mode, where you just hold down a button and talk.
You can also send photographs with ease. The latest version even lets you send videos.
If you don't want to keep the app open, and yet want to hear to audio messages as they arrive, you have to subscribe to their "Voxer Pro" service. It costs $3.99/mo or $29.99/year. That seems like a lot of money to speak to your wife, given that she's probably not listening anyways. ;-)
In my experience, Voxer is semi-reliable. It works as expected most of the time, but does not work perfectly all the time. Based on my experiences, I would not rely on it for critical communications.
Voxer is available for Android, iOS (iPhone, iPad or iPod), and Windows Phone 8 devices.
They also have a website at voxer.com where you can login and send/receive messages. Thus, you would get access with Windows, which you requested.
Here is an image of their phone interface:
Image Source: voxer.com