K-9 Mail AlternativesOnly apps categorised as Cloud Storage Services

The best Cloud Storage alternative to K-9 Mail is Infomaniak kMail, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 25 alternatives to K-9 Mail, but unfortunately only one of them is a Cloud Storage Service.

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K-9 Mail alternatives are mainly Calendar Apps, but if you're looking for Cloud Storage Services or Contact Managers you can filter on that. Other popular filters include iPhone, Linux, Android, Android + Open Source and Windows. These are just examples - use the filter bar below to find more specific alternatives to K-9 Mail.

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K-9 Mail alternatives page was last updated Aug 30, 2025

Infomaniak kMail
47 likes
Privacy-focused Swiss email system provides 20 GB free storage, supports custom domains and unlimited storage, syncs contacts and calendars, is ad-free, and is part of a secure productivity suite used by over a million users across Europe on all devices.
49 Infomaniak kMail alternatives
Cost / License
Freemium
Open Source (GPL-3.0)
Application types
WebMail Provider
Email Client
Origin
Switzerland
Platforms
Online
Android
iPhone
Android Tablet
iPad
F-Droid
+8
Is Infomaniak kMail a good alternative to K-9 Mail?

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1comment
Infomaniak kMail vs K-9 Mail Comments

Guest
Negative commentJul 21, 2024
0
The Infomaniak client only works with Infomaniak mail accounts, while K-9 Mail supports all mail accounts that use the standard IMAP and SMTP protocols
Review by a new / low-activity user.
Infomaniak kMail is Freemium and Open SourceK-9 Mail is Free and Open Source

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