Fossify Contactsβ β β β βBasic, privacy-respecting contacts app for Android that works with all contacts accounts on your phone.
Gearyβ β β β βReally lightweight but still modern, so itβs a good choice on lower-end hardware. Basic IMAP features, good for most day-to-day email use.
Gmail (Android App)β β β ββWorks well with multiple accounts and display modes, but tracks you more than it should.
K-9 Emailβ β β β βClassic email app for Android: No frills, no ads, no tracking. Supports multiple accounts, phone-to-tablet layouts, and dark mode.
Microsoft Outlook (Android)β β β β βIt works. More stable than the desktop version. Handles mail, calendar and contacts, offers the focused/other inbox view. Tries to keep you in Microsoftβs apps. OK for work, wouldnβt use it for personal mail.
Thunderbird (Email and Calendar)β β β β β Stable, capable desktop email application, works well with multiple accounts including Gmail, Nextcloud, easy to set up and use but with advanced settings when you need them. FLOSS.
Windows 10 Mail and Calendarβ β β ββNot a bad email client. Snappy, works with multiple accounts. Some issues with Nextcloud calendar and contacts. Of course itβs being discontinued.