Twobird is described as 'Welcome to Twobird, a new kind of email app that includes all your everyday tools. Write emails, create notes, set reminders and assign to-dos — all in your inbox' and is an app in the Office & Productivity category. There are seven alternatives to Twobird for a variety of platforms, including Mac, iPhone, iPad, Apple Watch and Android. The best alternative is Apple Mail, which is free. Other great apps like Twobird are Spark (Freemium), Airmail (Paid), Canary Mail (Paid) and Unibox (Paid).
Airmail is a lightweight and lightning fast mail client for Mac. Feature list: Accounts: - Unified Inbox and folders - Multi Account with editable html signatures. - Aliases management with custom SMPT
Email by Edison (formerly Email by EasilyDo) is a brand new, elegantly designed, universal mail app to manage unlimited mail accounts from different providers including Gmail, Yahoo Mail, AOL Mail, Hotmail, Outlook, Exchange, IMAP, Alto, iCloud and more.