When comparing Aqua Mail vs Nine, the Slant community recommends Aqua Mail for most people. In the question“What are the best Android e-mail clients with Exchange support?” Aqua Mail is ranked 5th while Nine is ranked 6th. The most important reason people chose Aqua Mail is:
Has been rated well on [AndroidForumsl](http://androidforums.com/threads/email-which-apps-keep-it-private.935578).
Ranked in these QuestionsQuestion Ranking
Pro Top rated for keeping you info private
Has been rated well on AndroidForumsl.
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 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 Good customization
But not so many you have to read and dig through documentation to do what you want.
Pro Convenient theme options
The black theme is easy on the battery and eyes.
Pro Supports latest ActiveSync protocols
As of this writing (Sept. 2016) it supports version 16.
Pro Very reliable
Pro Extremely customisable
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 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 Not free
Con Not Cross-platform at all
Only has an Android app. No Windows, Mac versions available.