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Gmail turns 15

The World's Most Popular Email Clients

15 years ago, on April 1, 2004, Google surprised many with the , its own web-based email client. With 1 gigabyte of free storage, conversation-based grouping of messages and enhanced search features, the service was superior to most, if not all competitors at the time, making its eventual success look inevitable in hindsight.

With 1.5 billion users, Gmail has grown into one of Google’s most successful products and one of the most popular email clients in the world. According to data published by , Gmail is only beaten by Apple’s native iPhone email app in terms of usage. According to Litmus’ analysis of 834 million email opens worldwide, 26 percent of those emails were opened within Gmail, while 28 percent were opened in the iPhone email client.

Description

This chart shows the top 10 email clients worldwide based on the share of email opens in March 2019.

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Global e-mail client market share 2026
Gmail: active users worldwide 2012-2024
Countries with highest number of emails sent 2025
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Global distribution of social engineering attacks abusing Gmail.com 2023, by type
Share of internet users using e‑mail services in Turkey 2004-2025
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E-mail user penetration in South Korea 2014-2024

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