Acompli is described as 'free, powerful and easy-to-use email app that helps you get more done from anywhere. Attach files easily, swipe to delete or defer emails, and schedule meetings effortlessly with a fully integrated calendar' and is an app in the Office & Productivity category. There are more than 10 alternatives to Acompli for a variety of platforms, including Android, iPhone, Android Tablet, iPad and Mac. The best alternative is Microsoft Office Outlook. It's not free, so if you're looking for a free alternative, you could try Spark or myMail. Other great apps like Acompli are TypeApp (Free Personal), Polymail (Paid), Aqua Mail (Freemium) and EmailTray (Free).
TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.
myMail is the smart email app for managing all your accounts on iOS and Android. Use myMail to manage messages in your Gmail, Hotmail, Live, Outlook, Yahoo, MSN, iCloud and AOL email accounts at once. The app also supports any IMAP and POP3-enabled mailbox.
EmailTray is a smart email client and an email notifier for POP3 and IMAP email accounts, including Gmail, Hotmail, Yahoo mail and AOL. EmailTray intelligently ranks messages, prioritizes them into 4 Inboxes and alerts you only to the most important.
ProfiMail is a powerful email client for mobile phones. It allows you to read your mail on the go, and send text with attachments directly from your phone. Send photos, recorded sound or simply text messages to friends, from anywhere.