When comparing Newton Mail vs Google Inbox, the Slant community recommends Google Inbox for most people. In the question“What are the best e-mail clients for Android? ” Google Inbox is ranked 6th while Newton Mail is ranked 10th. The most important reason people chose Google Inbox is:
Inbox follows Google's Material Design guidelines, making for an intuitive and smart looking interface. Bold colors with clear text and intuitive actions allow for one of the better looking in house Google apps on Android.
Specs
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Pros
Pro Multi-account support
Gmail, Yahoo Mail, Outlook, iCloud, Google Apps, OWA, Microsoft Exchange, Office 365, AOL and other IMAP accounts.
Pro Synchronizes settings across devices
CloudMagic saves settings in the cloud. When you switch devices, the app simply pulls your setting from the cloud.
Pro Beautiful, clean design
Intuitive, easy to use user interface.
Pro Unified inbox
Option to view one inbox for all your email accounts.
Pro Emails can be downloaded locally on a per-folder basis
A feature called "sync" allows downloading emails locally on a per-folder basis. That will allow accessing them while offline, keep them always up to date, provide faster search, show unread email count and show push notifications as soon as new messages in those folders pop up.
Pro The app can be locked
It's possible to lock the app behind a four digit passcode.
Pro Helps deal with emails quickly
It's possible to archive, delete or mark emails as read from the notification tray or with swipe gestures.
Pro Android Wear support
Cloud Magic supports sending notifications to Android Wear devices, allowing the user to easily see their mail without having to take their phone out.
Pro Can snooze emails
It's possible to "hide" a message for a set amount of time, which gets the message out of your way until you're ready to deal with it.
Pro Email tracking
Get notified when the recipient reads the e-mail.
Pro Integrates with other services to extend functionality
CloudMagic has 'cards', that allow quick interactions with other services, like Evernote, MailChimp, Salesforce, Trello, etc. And unlike similar integration, these interactions happen within the app itself.
Pro Great search
The app is capable of searching through all of your email and cloud accounts to find specific information. The results show up as they are typed in.
Pro Free trial
Newton mail offers a 14-day free trial.

Pro Good-looking interface
Inbox follows Google's Material Design guidelines, making for an intuitive and smart looking interface. Bold colors with clear text and intuitive actions allow for one of the better looking in house Google apps on Android.
Pro Intelligent categorization
Inbox tries automatically bundling similar messages together. For example, Inbox will create bundles for travel information, receipts, promotions as well as group messages temporally. It enables also managing these bundles of messages together - they can all be swiped away together.
Pro Can snooze emails
It's possible to "hide" a message until a specific date and time or location, which gets the message out of your way until you're ready to deal with it. Swipe left and you can have the email disappear for a day, a week, a month, etc.

Pro Helps deal with messages quickly
Inbox has intuitive swipe gestures that allow quickly dealing with emails or groups of emails. It's possible to mark them done, archive them or snooze them for later by swiping. It allows you to keep inbox at zero messages easily.
Pro Surfaces important information from messages
If an email contains pictures, flight information, reservation at a restaurant, attachments, links, dates, phone numbers and other information that the application recognizes, it will surface that information in its main view. These items can be viewed and interacted with without having to open the message itself. It allows finding and taking action on the important email information quickly.
Pro Can add notes to emails
You are able to add notes or reminders to pinned items - very useful for long email chains when you can't remember what the main point was!
Pro Integrates Google Now reminders
For users of Google Now, Inbox integrates with the service allowing for reminders to be seen while using Google Now as well as set through the service.
Pro Integrates realtime updates in messages
Through a feature called Assists, Inbox offers context sensitive updates to messages. These include information such as flight status updates before a scheduled flight.
Pro Can create tasks from dates and tasks in messages
If a message includes a date, Inbox is capable of automatically creating a task from that information.
Pro Auto replies
Can reply to emails using an AI generated response
Pro Trips Bundle
Centralized "folder" for trip info such as airline, hotel, and rental car reservations. Similar to Google Trips.
Pro Categorizes mails by Bundles
In addition to the several automatic categories, you can also create your own bundles. Thus reduces clutter and enables you to archive a whole bunch of mails with one swipe.
Cons
Con Not free anymore, needs a subscription ( $49.99/yr)
The apps stared as a free app but since some time it's only free for 14 days (trial).
After the trial it needs a subscription which is very expensive with $50/yr comparing the features with other free E-Mail apps
Con Privacy concerns
Their privacy policy states that they have complete access to your mail.
We then use the authorization provided to download your emails on the cloud and push to your devices. We use AWS servers to store your data: emails and authorization.

Con Only supports Gmail accounts
No exchange email support or importing of any other e-mail services mail.
Con Will be shut down in March 2019
Con No rich-text (HTML) formatting for composing mails
Con No way to mark a message as unread once it's read
Con No way to delete a single message in a bundle
