When comparing Gboard - the Google Keyboard vs Today, the Slant community recommends Today for most people. In the question“What are the best Material Design apps?” Today is ranked 3rd while Gboard - the Google Keyboard is ranked 14th. The most important reason people chose Today is:
In addition to day, week and agenda views that have improved aesthetics and usability features compared to the stock app, there are also two views that combine agenda and month views in interesting ways. One approach shows a complete, color-coded month with agenda view beneath it and the second shows a complete month that pops up agenda view when clicked on a date.
Specs
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Pros
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 Material Design
Google Keyboard has material design themes the user can skin the keyboard with.
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 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 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 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 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 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.
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 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 120 languages support
Pro GIF support
Pro Cloud backup
Pro Pre-installed on most Android devices
Most Android devices have GBoard installed.
Pro Has improved common views and two great views that combine month and agenda views
In addition to day, week and agenda views that have improved aesthetics and usability features compared to the stock app, there are also two views that combine agenda and month views in interesting ways.
One approach shows a complete, color-coded month with agenda view beneath it and the second shows a complete month that pops up agenda view when clicked on a date.
Pro Polished agenda and month widgets
The app has minimalistic, semi-transparent, good-looking and customizable homescreen widgets for agenda and month views. Attributes that can be customized include choosing between light and dark themes, 12 and 24 hour clock, if the widget header should be displayed as well as adjusting opacity level and date range among other options.
Pro Actionable notifications
On-screen notifications have a shortcuts for map and ability to snooze them.
Pro Clean, good-looking design
Google Calendar has an easy to overview interface, that doesn't overwhelm with options. It's based on Google's stock Calendar application with modifications to user interface and functionality.
Pro Straightforward event creation
To quickly add an event, each view has an option to either click a plus button somewhere on the screen or long-press a date to bring up a form. The long-press form will allow entering only the event name and assume that it's an all day event, while the plus button form allows setting the event duration as well.
Both forms have an edit button for a adding more detailed information. This way in addition to selecting an event name and date, there's an ability to add location, start/end times, guests, description, color-code as well as choosing if it's an all day event, how often it repeats, how many and what kind of reminders are needed and setting your availability and privacy settings.
Pro Color-coding support
The app will color-code different calendars in different colors as well as allow selecting a different color for each event.
Pro Free 2-week trial
It has a 14-day trial and costs $2.99 to use full-time.
Pro Can set on-screen and e-mail reminder notifications
Google calendar allows setting how many reminders are needed with each having the ability to set how long before the event the notification should remind and if it should be done via on-screen or e-mail notification.
Pro Integrates with Google Maps for directions
The app leverages Google Maps when adding location for an event by offering suggestions as well as offers opening Maps to help get directions to an event via shortcut on a reminder notification.
Cons
Con Typing is not always smooth
Sometimes typing lags.
Con Horrible Word Prediction
Unable to remember frequently used words.
Con Adds periods in random places and there is no way to disable it.
Con Lacks some features
Does not add contacts, does not save clipboard, and doesn't show the correct spelling of words or underline them, even though it's in settings.
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 Restricted customization (few skins)
Con Terrible layout in landscape mode
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 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 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.
Con Google, via the keyboard app, might be collecting data on us that it then sells to third parties which in turn can use that data to influence us
Con No natural language input support
Con No weather forecast
