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BoxWave Keyboard Buddy at boxwave.com
"One of the most common types of keyboard cases: a slab with a slide-out keyboard, backlighting optional."
BoxWave Keyboard Buddy - Vertical Edition at boxwave.com
"A vertical version of the above, this case will transform your iPhone 4/4S into what's essentially a Blackberry."
HIGHOT Ultra-Thin Slide-Out Keyboard at Amazon
"HiIGHOT'S model offers what you'd expect, at a much lower price point than BoxWave's collection."
TOP for iPhone Shock Proof PU Leather Case at Amazon
"A hybrid option, giving you a folio-style leather case which flips open to reveal a keyboard."
OEM Slider Keyboard at myphonecase.com
"It seems that this OEM keyboard is the one that other companies buy and import."
BoxWave's Keyboard Buddy case demonstrates one of the most common form factors for these cases: a slab that the iPhone clips into which includes a slide-out keyboard on the bottom. The keyboard, which connects wirelessly via Bluetooth, works with any app where the onscreen keyboard would appear and can be hidden when not in use. It adds 0.68 inches to the thickness of the iPhone, which isn't terrible.
BoxWave offers versions of the case for the iPhone 4, 4S, 5, 5S, 6 and 6S and with and without backlighting on the keys (which is helpful for typing in low-light situations).
List Price: US$79.95
Weight: UnknownBacklight: Yes (though there's also a non-backlight version)iPhone 7 Support: Not listed, but possible since they're similar to the 6 seriesiPhone 6 Plus/6S Plus/7 Plus Support: NoiPhone 6/6S Support: YesiPhone 5/5S support: Yes
This version of BoxWave's Keyboard Buddy case takes the same basic idea—a slide-out keyboard that is attached to the back of the iPhone—and re-orients it. Instead of sliding out from the side of the iPhone so that it can be used in landscape mode, this keyboard slides out from the bottom, letting you type with the iPhone in portrait mode. Which version you'll prefer depends on how you like to type on your iPhone, but BoxWave is the only company I'm aware of that offers these options.
Because BoxWave makes these keyboards specifically for the iPhone, they include buttons that control iPhone features like screen brightness, media playback, hiding the keyboard, and more.
List Price: $79.95
Weight: UnknownBacklight: NoiPhone 5/5C/5S support: NoiPhone 4S support: YesiPhone 4 support: Yes
You won't find any special features on the HIGHOT case. It's a solid, straightforward affair that offers what you'd expect: A keyboard case that you can turn off when it's not in use, USB recharging, and a backlight. The appealing thing about this option, really, is its price. At just $21, it's easily the least expensive option on this list.
List Price: $20.99
Weight: 4 ozBacklight: YesiPhone 6/6S Support: YesiPhone 6 Plus/6S Plus Support: NoiPhone 7 series Support: No
The TOP Shock Proof PU Leather Case takes a hybrid approach, combining the keyboard cases we've seen on this list so far with a popular, folio-style leather case. Instead of having the keyboard slide out from behind the phone, the case flips open to reveal the keyboard. Prop up the iPhone and you're ready to type. The case's flap also contains a slot to hold credit cards or a license.
List Price: $49.99
Weight: 6.4 ozBacklight: Not listediPhone 6/6S Support: YesiPhone 6 Plus/6S Plus Support: NoiPhone 7 series Support: Not listed
This one is a little tricky, since you'll see a keyboard that looks a lot like this for sale under many brand names. As far as I can tell, that's because this is an OEM (Original Equipment Manufacturer) Bluetooth keyboard that companies buy and import, then put their own names on and sell. If I'm wrong about this, I'd appreciate it if any of the companies listed here contacted me.
This keyboard is another model that clips onto the iPhone and slides in and out for use. It doesn't have a backlight, but does offer a single accessory that works with both the iPhone 4S and iPhone 4. It has shortcut keys for home and Spotlight.
Sold under the following brands: Concord Keystone, EStand, iMounTek, Ion, Hipstreet, Naztech
List Price: $49.99-$79.99
Weight: 2.8 ozBacklight: NoiPhone 5/5C/5S support: NoiPhone 4S support: YesiPhone 4 support: Yes