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Best Catmail Apps

196+ iOS apps curated and reviewed

4.4 avg rating
18 free apps
Updated July 2026

Microsoft Outlook is the household name in catmail, but it's far from the only option. We track 196+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Top Picks for Catmail

Microsoft Outlook#1

Microsoft Outlook by Microsoft Corporation

Secure Email, Calendar & Files
Editor's Choice
📊 Productivity
4.8😐(9M ratings)
FreeAdsIn-App Purchases
#9in Productivity
Microsoft Outlook screenshot 1
Microsoft Outlook screenshot 2
Microsoft Outlook screenshot 3
Microsoft Outlook screenshot 4
Microsoft Outlook screenshot 5
Microsoft Outlook screenshot 6

Consolidate all your email accounts and calendars into one streamlined application. Manage your inbox, schedule meetings, and access files from various cloud services. Enhance productivity with AI-powered writing assistance and smart inbox features.

What We Love

  • 🚀 Great for corporate email
  • 👍 Customizable and user-friendly
  • 🚀 Seamless integration with Microsoft 365
  • 👍 Solid email and calendar functionality

Room to Improve

  • 🐛 Buggy and unstable at times
  • 🔋 High battery consumption
  • 🔒 Security issues with password resets
Mail#2

Mail by Apple Inc.

Strong Contender
📊 Productivity
4.7😐(4M ratings)
Free
Mail screenshot 1
Mail screenshot 2
Mail screenshot 3

Consolidate all your email accounts into a single, organized inbox. Prioritize important messages, quickly respond with smart replies, and manage your inbox efficiently with features like scheduling and snoozing. Enjoy enhanced privacy with IP address hiding and read receipt prevention.

What We Love

  • 🚀 Efficient email management
  • 🔒 Secure and private
  • 👍 Simple and intuitive interface
  • 💡 Useful categorization of emails

Room to Improve

  • 🐛 Inconsistent swipe gestures
  • 🐛 Unreliable search function
  • 🐛 Emails disappearing or not syncing properly
Gmail - Email by Google#3

Gmail - Email by Google by Google LLC

Secure, fast & organized email
Worth Considering
📊 Productivity
4.7😐(2.4M ratings)
FreeAdsIn-App Purchases
#5in Productivity
Gmail - Email by Google screenshot 1
Gmail - Email by Google screenshot 2
Gmail - Email by Google screenshot 3
Gmail - Email by Google screenshot 4
Gmail - Email by Google screenshot 5
Gmail - Email by Google screenshot 6

This application provides a secure and efficient email experience with advanced features like spam blocking, smart replies, and multi-account support. It integrates with other Google services for enhanced productivity and collaboration.

What We Love

  • 🚀 Efficient email management
  • 👍 Easy to use interface
  • 🔒 Secure and reliable
  • 😊 Positive user experience overall

Room to Improve

  • 🐛 Bugs and glitches
  • 💡 Lacking advanced features
  • 🔒 Security concerns

More Catmail apps to explore

4
Email for Hotmail, Outlook
Email for Hotmail, Outlook
Email for Hotmail, Outlook
Support Outlook, Hotmail
Free

Manage your Hotmail, Outlook, Live, and MSN email accounts with a fast, secure, and intuitive app. It offers unified inbox management, push notifications, advanced search, and secure sign-in options for a seamless email experience.

Unified inbox for multiple accountsFast and secure sign-inPush notifications for new emails
🔧 Utilities
(1.4K)
free with in-app purchases
5
Email for Hotmail & Outlook
Email for Hotmail & Outlook
Email for Hotmail & Outlook
Support Hotmail, Outlook, O365
Free

Streamline your email experience with this app designed for control, privacy, and simplicity. Manage multiple accounts, filter messages, and enjoy real-time notifications. It offers advanced features like custom swipes and secure unlocking to help you achieve more with your inbox.

Unified inbox for multiple accountsAdvanced filtering and searchCustomizable swipe gestures
🔧 Utilities
(2.5K)
free with in-app purchases
6
Mail+ for Outlook
Mail+ for Outlook
Mail+ for Outlook
by MAIL PLUS APP LLC
$4.99

Access Outlook email and calendar securely on your iOS device. Manage work and personal accounts separately with tools designed for mobile business users, including rich text editing and scheduling assistance. Supports various Exchange versions and popular email services.

Secure Outlook email accessCalendar event managementRich HTML text editing
💼 Business
(840)
free with in-app purchases
7
myMail box: email client app
myMail box: email client app
myMail box: email client app
E-mail for Gmail, Hotmail, AOL
Free

Consolidate and manage multiple email accounts from various providers in a single, user-friendly interface. Enjoy customizable notifications, enhanced security features, and efficient search capabilities to streamline your communication.

Unified inbox for multiple email accountsCustomizable push notificationsEmail thread view
📊 Productivity
(17K)
free with in-app purchases
8
Airmail for Gmail Outlook Mail
Airmail for Gmail Outlook Mail
Airmail for Gmail Outlook Mail
Your Mail With You
Free

This powerful mail client offers a streamlined inbox experience with extensive customization options. It supports multiple email accounts and integrates seamlessly with other apps and services for enhanced productivity. Enjoy features like snoozing, interactive notifications, and iCloud sync for a unified workflow across devices.

Support for multiple email accounts (Gmail, Outlook, IMAP, POP3)Customizable swipes and interactive push notificationsSnooze and bulk editing of messages
📊 Productivity
(4K)
free with in-app purchases
9
Mail App for Hotmail
Mail App for Hotmail
Mail App for Hotmail
Supports Hotmail & Outlook
Free

Manage your Hotmail and Outlook inboxes with speed and security. This app unifies multiple Microsoft email accounts into a single, efficient inbox. Features include smart search, advanced filters, customizable signatures, and enhanced security options.

Unified inbox for multiple Microsoft accountsFast email fetching and searchingSmart search and contact detection
🔧 Utilities
(143)
free with in-app purchases
10
Email App for Gmail
Email App for Gmail
Email App for Gmail
and other mail services
Free

Manage your Gmail and other email accounts with a beautifully designed, fast, and secure application. Enjoy intuitive actions, custom notifications, and advanced security features to keep your inbox organized and protected.

Custom push notificationsUser-friendly interfaceContact avatars and email threads
📊 Productivity
(4.1K)
free with in-app purchases
11
MailTime: AI Email Inbox
MailTime: AI Email Inbox
MailTime: AI Email Inbox
Gmail, Outlook, Yahoo Inbox
Free

This app transforms your email inbox into a streamlined, chat-like experience. It integrates multiple email accounts and uses AI to help you draft replies, proofread messages, and manage conversations efficiently. Enjoy a clutter-free inbox and communicate as easily as sending a text message.

SMS-style email conversationsAI-powered email repliesProofread, shorten, expand messages
📊 Productivity
(96)
free with in-app purchases
12
Email - Edison Mail
Email - Edison Mail
Email - Edison Mail
No more Spam - Inbox Zero
Free

Manage multiple email accounts in one unified inbox. This app offers fast email fetching, smart search for important information, and tools to reduce inbox clutter. It prioritizes privacy and security with features like sender blocking and biometric protection.

Unified inbox for all accountsFast email fetching and searchOne-tap unsubscribe
📊 Productivity
(78K)
free with in-app purchases
13
MailBuzzr for Outlook
MailBuzzr for Outlook
MailBuzzr for Outlook
Email for Hotmail and Outlook
Free

Manage all your Hotmail and Outlook accounts in one fast, beautifully designed app. Get smart notifications, organize emails with tags and filters, and undo actions easily. Enjoy a frustration-free email experience with an elegant interface and custom themes.

Unified inbox for multiple accountsSmart notifications with customizable alertsQuick email preview and undo actions
📊 Productivity
(520)
free with in-app purchases
14
Email Client - Boomerang Mail
Email Client - Boomerang Mail
Email Client - Boomerang Mail
Gmail, Outlook E-mail Triage
Free

Manage all your email accounts in one place with features like read receipts, scheduled sending, and AI-powered writing feedback. Quickly schedule meetings directly from your inbox and pause incoming messages when you need to focus.

One-tap calendar schedulingRead receiptsEmail scheduling
📊 Productivity
(4.7K)
free with in-app purchases
15
Proton Mail - Encrypted Email
Proton Mail - Encrypted Email
Proton Mail - Encrypted Email
Fast, private & secure mail
Free

This encrypted email service from Switzerland prioritizes user privacy with end-to-end encryption. It offers robust security features to protect your communications from phishing, spam, and tracking, allowing you to manage your inbox with ease.

End-to-end encryptionPassword-protected emailsMultiple account support
📊 Productivity
(45K)
free with in-app purchases
16
Boxer - Workspace ONE
Boxer - Workspace ONE
Boxer - Workspace ONE
Omnissa Workspace ONE
Free

Manage email, calendar, and contacts efficiently with customizable tools like swipe gestures and quick replies. This app offers a modern, intuitive interface designed for professionals to boost productivity on the go. It also includes features for seamless conference call dialing and robust data security.

Unified email, calendar, and contactsCustomizable swipe gesturesQuick reply templates
💼 Business
(77K)
free
17
Mail App for Gmail
Mail App for Gmail
Mail App for Gmail
Get Email Done
Free

This app offers a streamlined experience for managing your Gmail inbox, focusing on quick triage and instant message sending/receiving. It boasts a fast, reliable performance, especially on VPNs, and a beautiful, animated interface.

Fast email management toolsMultiple actions for inbox tasksReliable VPN performance
📊 Productivity
(8.1K)
subscription
18
Webmail App
Webmail App
Webmail App
Independent email application
$2.99

Manage all your email accounts from one secure application. This professional client offers features like unified inboxes, customizable filters, and advanced security protocols to keep your data safe. It supports multiple languages and provides a streamlined experience for both personal and corporate email needs.

Manage multiple email accounts (IMAP, Exchange, POP)Unified mailbox for all accountsEmail synchronization and scheduling
📊 Productivity
(733)
free with in-app purchases
19
Messenger
Messenger
Messenger
SMS, 음성 및 영상 통화
Free

Connect with friends and family through text, audio, and video calls. Share photos, videos, and large files, and express yourself with custom themes and animated content. Features an AI assistant for help and support.

Text, audio, and video callsHigh-definition photo sharingShared photo albums
🌐 Social Networking
(13M)
free with in-app purchases
20
mail.com - email & cloud
mail.com - email & cloud
mail.com - email & cloud
Mailbox for storage & mail
Free

Manage your emails and cloud storage from a single app. Receive instant notifications for new messages and access your contacts and documents on the go. Secure your account with PIN or biometric authentication.

Unified inbox for all email addresses2GB cloud storagePush notifications
📊 Productivity
(103K)
free with in-app purchases