A free app for Android, by Readdle Inc..

Spark brings the email experience to professionals and their teams on Android. With it, you can manage multiple email accounts in one app, from business to personal. It is one of the best email management apps available on Google Play.

Spark brings all your email accounts in one place, allowing you to stay organized and productive. It also provides tools to help you collaborate with your team, which is perfect for the team-oriented business. You can collaborate with other professionals on their team, and they can collaborate with you on their team. 

You can collaborate with your team and clients on the same app and have a more interactive and effective communication. It is also a great way to stay organized and organized, as you can see what is going on at a glance.