But this one is:
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.
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.
The first one is free. The second costs $1.99 -- I actually have it -- it was FAotD back in April. Haven't used it though.

So, I'll correct myself from earlier: I have seen one, but had forgotten about it!