When comparing Aqua Mail vs Nine, the Slant community recommends Aqua Mail for most people. In the question“What are the best Gmail clients for Android?” Aqua Mail is ranked 6th while Nine is ranked 10th. The most important reason people chose Aqua Mail is:
Has been rated well on [AndroidForums](http://androidforums.com/threads/email-which-apps-keep-it-private.935578).
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Top rated for keeping your info private
Has been rated well on AndroidForums.
Pro Ultra fast and intuitive
The app refreshes emails in seconds and has an intuitive menu. You can do a lot with one or two swipes.
Pro Integrates with cloud storage services for backup and restore
It's possible to backup the app along with account settings via services like Dropbox, OneDrive, Box.com, Google Drive.
Pro Integrates with Tasker
Tasker is an automation app. Aqua Mail's Tasker integration allows changing settings, triggering message based events and running mail checks based on criteria like time of day, location, timer, connection type, etc.
Pro Pro version often goes on sale
The developer usually gives a 25%-50% discount every few months or so on Google Play.
Pro Can adjust color themes for each account.
Pro Supports ActiveSync protocols
Pro Convenient theme options
The black theme is easy on the battery and eyes.
Pro Good customization
But not so many you have to read and dig through documentation to do what you want.
Pro Supports Outlook category colors, Outlook for Android doesn't
Pro Very reliable
Cons
Con Floating ads in free version
It shows floating ads in the email list and they can not be deleted.
Con Limited signature capabilities
Signatures can't have images or HTML.
Con Does not support pgp or metacert
Con Free version supports only 2 accounts and adds promotional email signature
The base, free application supports up to two accounts and adds a promo signature to all outgoing messages.
Con No support for Exchange Activesync protocol
This is the de facto, secure Exchange over the web protocol used and is enforced by most businesses for enterprise email. Aqua only supports EWS for Exchange, which most enterprise administrators block or disable.
Con Not free
Con Not Cross-platform at all
Only has an Android app. No Windows, Mac versions available.