That 7-inch tablet, a nabi 2S, has a powerful Tegra 3 processor, a full gigabyte of RAM, and runs a heavily modified version of Android 4.2 Jelly Bean, a reasonably recent release.

Big Tab HD packs an Nvidia Tegra 4 CPU, 2GB of RAM, a rear-facing camera, Wi-Fi, Bluetooth 4.0 and NFC. The operating system is based on Android 4.4, with Nabi’s Blue Morpho custom kid-friendly ...