2
Microsoft Outlook
Free for personal use; also in Microsoft 365
Email, calendar and contacts in one app, on every major platform.
Pick it if you need it on iPhone and the web and you run a small business.
Free planiPhoneAndroidMacWindowsWeb
At a glance
| App | Price | Platforms | Pick it if |
|---|---|---|---|
| Thunderbird (the app you have) | Free | Android, Mac, Windows, Linux | - |
| Spark Mail | Free plan | Everywhere | you need it on iPhone and the web |
| Microsoft Outlook | Free for personal use | Everywhere | you need it on iPhone and the web |
| Apple Mail | Free with Apple devices | Apple | you need it on iPhone |
| eM Client | Free | Windows, Mac, iPhone, Android | you need it on iPhone |
| Spike | Free and Pro plans | Everywhere | you need it on iPhone and the web |
| mail.com | Free | iPhone, Android | you need it on iPhone |
| Yahoo Mail | Free | Apple | you need it on iPhone |
| Airmail | Free for one account | Apple | you need it on iPhone |
1
Spark Mail
Free plan; Plus about $10/month
A cross-platform email app with a Smart Inbox and an AI assistant.
Pick it if you need it on iPhone and the web and you want AI built in.
Free planiPhoneAndroidMacWindowsWeb
3
Apple Mail
Free with Apple devices; some features need iCloud+
The built-in mail app on every iPhone and Mac, with strong privacy features.
Pick it if you need it on iPhone, you want something simpler and you are just starting out.
FreeiPhoneMac
4
eM Client
Free; Personal $49.95/year or $74.95 one-time
A full desktop email client for Windows and Mac with calendar, tasks, contacts and chat, sold by subscription or one-time license.
Pick it if you need it on iPhone and you run a small business.
Free planWindowsMaciPhoneAndroid
5
Spike
Free and Pro plansEmail that reads like chat, with team spaces, docs and tasks alongside.
Pick it if you need it on iPhone and the web, you want AI built in and you work with a team.
Free planiPhoneAndroidMacWindowsWeb
6
mail.com
Free
mail.com's email and cloud app.
Pick it if you need it on iPhone.
FreeiPhoneAndroid
7
Yahoo Mail
Free
Yahoo's email app with smart inbox views.
Pick it if you need it on iPhone.
FreeiPhone
8
Airmail
Free for one account; Pro about $6/month or $30/year
A polished email client for iPhone, iPad, Mac and Apple Watch.
Pick it if you need it on iPhone.
Free planiPhoneMac
We matched these apps to Thunderbird by what they are for, who they suit and where they run, using our research on each app's official website and app store listing. We have not tested them hands-on for this page. Check the price on each app's own site before you buy.