Best Spike Alternatives & Competitors in 2025

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Secure email with absolutely no compromises. Get your free encrypted email account today.

freemium €5.0 / Monthly (user - 5 GB)

Improve team performance continuously with time tracking automation.

Try for free freemium €2.0 / Monthly

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues

Open Source

The platform for exceptional customer service at scale.

BlueMail is an email management app for Android, iOS, and Windows.

Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.

Keep your conversations secure, everywhere.

Learn about Proofpoint's email security solutions that protect organizations against threats such as email fraud, phishing, spam, bulk email, and viruses.

Paubox provides HIPAA compliant email encryption without the hassle of extra steps.

Mailbird is the best email client for Windows 7, 8 and 10

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Zoho Mail is a secure, encrypted, and enterprise-ready email solution, a suite of apps tailor-made for your organization's needs.

freemium $1.0 / Monthly (per user)

K-9 is an opensource email client making it easy to chew through large volumes of email.