Get Your TransferPhoto Transfer App is rated at 4.5 stars in Google Play. It is rated at 3.3 stars in the Amazon Appstore.
Photo Transfer App allows you to easily transfer photos and videos from your Android device to your computer as well as exchange photos from and to another Android device, iPhone, or iPad using your Wi-Fi network.
Androids and Apples
Upload multiple photos from your computer to your device. Transfer photos and videos from one Android device to another over Wi-Fi; no cables are necessary. Transfer photos from your Android device to an iPhone or iPad and vice versa.
Please note: to transfer photos from to an Android device to an iPhone/iPhone, both devices must have Photo Transfer App installed. Access to a Wi-Fi network is required for this application to work. Some public Wi-Fi networks, such as hotels or public spaces, may be configured to block communication between devices.
There is also an iOS version of the app (obvious, since this app advertises ease of transfer between iOS devices and Android devices) (iTunes link) priced at $2.99 and rated with 5 stars for the current version and 4.5 stars overall.
Notably, there's no concern about privacy: photos and videos are transferred directly from device to device using your local wi-fi network. They are never stored on an external server and they never leave your LAN.
Why the difference between the reviews? Basically, two of the five 1-star ratings (at the time of this writing) mention DropBox as an alternative (free), two mention using cabled transfer, and one was a spoof review that should be removed.
Obviously, there's nothing wrong if you prefer DropBox that requires an external server. What if you don't that? Also, sure you can use a cable to transfer, but this is far easier. Silly to downrate it because you have a different opinion. A review should cover the app, not an opinion of a different method.
Given that: buy it now, while it's free. Get the iOS version, as well.
There is a free version in Google Play, but only seven people have rated it (4.3 stars) and it has less downloads than the paid version, since it limits tranfers to only two photos at a time. That shows that despite the issues of getting people to pay for apps on Android, write an app that's good enough, and it still happens.
what it means to developers.
Amazon.com opened up the Appstore despite a lawsuit by Apple, which has previously trademarked the term "App Store." Microsoft has filed an appeal against that trademark, saying the term is too generic. Amazon.com has responded to the lawsuit in the same manner.