Multi-platform note-taking program Evernote on Monday announced it had reached more than 10 million registered users.

The 10 million mark is a significant bump from the company’s reported 6 million users in January. It also reported that more than 400,000 of its customers pay $5 a month for a premium plan that enables bigger uploads and better collaborative tools.

“Ten million users seemed like an inconceivable number when we were getting ready to launch the service into open beta less than three years ago,” founder and CEO Phil Libin wrote on the company’s blog. “Well, it wasn’t literally inconceivable; we actually put it on business plans and investor pitch decks and everything.”

Evernote launched less than three years ago and helps customers keep notes in sync across different computers and mobile devices. In that time, the service has pushed itself on to an impressive number of platforms, with apps for iPhone, iPad, Android, BlackBerry, Windows, Mac, and more.

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Libin’s blog post notes that 75% of its customers access Evernote on two or more platforms. The graph below details customer usage in better detail.

Evernote Hits 10 Million Users

Recently Evernote significantly revamped its website and its Android app. The company has raised around $45 million in funding from Sequoia Capital, Morgenthaler Ventures, DoCoMo Capital, Troika Dialog, and others.

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