The all-in-one keyboard from Google with conventional, gesture, and voice typing, plus the ability to search Google without leaving the app you're in.
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Pro 100% free from Google
This keyboard is not a free trial nor will it hold back any new features to sell you a paid version. The keyboard is completely 100% free.
Pro Swipe support
The Google Keyboard supports swiping along the keyboard to spell out whole words.
Pro Learns preferred words
After using a gesture a few times and clicking the correct word, Google Keyboard learns that the gesture should result in the word you've manually selected as the correct word. Swype doesn't seem to learn this, so even after 100 times clicking 'this' instead of 'thesis', it still produces 'thesis', where Google Keyboard learns that you meant to say 'this'.
Pro Minimalistic design
While other keyboard options may be very functional, their visual design tends to differ from the rest of your Google device. The Google Keyboard was designed by Google and it looks like it.
Pro Material Design
Google Keyboard has material design themes the user can skin the keyboard with.
Pro Has built-in Google search
The keyboard has button that allows searching Google straight from the keyboard, and use the search results in the currently used app.
Pro Emoji search
The GBoard has an emoji search that's very convenient, saves time looking for a specific one if you don't know/remember what category it's in.
Pro Fast, low memory usage
Alternative keyboards tend to suck up system resources, often making them nearly unusable on older phones. Google Keyboard is very quick to open when typing and the keys rarely lag.
Pro One-handed mode
Makes it easier to type with no more than a thumb.
Pro Suggestions don't get worse over time
Google keyboard does not promise to be as "smart" as other keyboards besides offering a personalized dictionary. Surprisingly this is actually a good thing for some because with many "smart" keyboards predictions and corrections actually worsen over time. With Google Keyboard the experience will remain constant because it requires you to manually "touch again to save" before it changes your personal dictionary. This prevents mistakes from becoming part of your personal dictionary.
Pro Can use alternative layouts not just QWERTY
For those that are used to typing on a Dvorak keyboard or prefer not to need multiple key presses to access special symbols they can enable these as additional quick switch options. Using the English PC layout for example gives the user a number row.
Pro Swipe to punctuation
Hold down the key in the lower left hand corner and a keyboard if punctuation appears. Swipe over to the one you want, lift your finger, and the original keyboard pops back. It's very fast, and makes it much easier to spot the punctuation mark you want - instead of trying to squint at the secondary symbols in the keys.
Pro Dynamic floating preview
The dynamic floating preview appears while gesture typing. Most gesture keyboards only show the preview above the keyboard in the suggested corrections. The dynamic floating preview is great because it makes it easier to gesture type by keeping your eyes focused on what you are typing.
Con Very little customization
Google Keyboard allows you to enable or disable
vibrate on keypress
sound on keypress
popup on keypress
double space period
These are pretty useful basic settings but most other keyboards offer more options. Google also allows you to edit the personal dictionary.
Con Horrible Word Prediction
Con Typing is not always smooth
Sometimes typing lags.
Con Restricted customization (few skins)
Con Takes up a lot of storage
If you are using multiple languages and predictive text, the app can use up a lot of storage.
Con Prediction isn't as good as SwiftKey
Con Uses a lot of RAM
Con Can't pop out keyboard
The keyboard can't float above an app and is instead docked to the bottom. Other keyboard apps allow for the keyboard to do this.
Con Symbol order is (slightly) different from full-sized QWERTY keyboard
Instead of the first four symbols being !@#$%^& (i.e. shift+1 through 7 on a QWERTY keyboard), they're @#$%&. This is fine if you know the symbols in your password, but if you're like me and you just hold the SHIFT key and type a long number, you'll have to consult a real keyboard to figure out your password.
Con Other languages not available in transliteration mode
Unlike Google Indic Keyboard where you can type by transliteration, compact, and handwriting, you only get the fixed layout for other languages.
Con Only 26 languages
While a keyboard available in 26 languages is nothing to be ashamed of, other keyboard options simply offer more. SwiftKey is available in 61 languages and Swype is available in 71. Fortunately, if your language is one of the 26, you're good.
Con It doesn't have arrow keys
Several times it is much better to navigate through a long text using arrow keys than scrolling and tapping the place where you want the cursor to be. SwiftKey has arrow keys (via an option), Gboard has not.