Yahoo has acquired to-do list app Astrid for an undisclosed sum.
Astrid co-founder Jon Paris announced the acquisition in a blog post, noting that Astrid will continue to work normally over the next 90 days. The company will, however, no longer be accepting any new premium subscriptions.
"When we set out to build Astrid, we sought to help as many people as possible become happier, healthier and more productive," Paris wrote. "We're really excited to join the mobile team and continue this work with Yahoo's goal of 'making the world's daily habits more inspiring and entertaining.'"
Yahoo CEO Marissa Mayer welcomed the firm in a tweet. "Welcome to @Yahoo, @astrid!! Excited to have you :)," she wrote.
The Astrid team will join Yahoo's mobile organisation in Sunnyvale, California, a Yahoo spokeswoman said.
"Their background in personalised mobile experiences is impressive, and we know they will be a huge asset to as we continue to re-imagine our products," she said.
Astrid, described as "the personal assistant you've always wanted," is an app that lets users create to-do lists that automatically sync across devices and the web. The app shows users fun reminders like "Ready, Tiger?" and lets users share their lists with others. More than four million users have downloaded the app, Astrid said.
During the transition, Astrid will reach out to users with information about how to download their data. In addition, Yahoo will be offering refunds to users who have already paid for annual subscriptions.
Yahoo has been on somewhat of an acquisition spree in recent months. In March, it picked up social recommendation site Jybe. The same month, Yahoo shelled out a reported $30 million (£19.3m) to buy Summly, a mobile app created by London teenager Nick D'Alosio that organises news stories into a fast, easy-to-browse window. Yahoo has since incorporated Summly technology in its iOS and Android apps.