Remember The Milk’s website banner presently shows:
- Manage tasks from anywhere
- Get email, SMS, or IM reminders
- Share your tasks
- Access from your phone
- Manage tasks offline
- Use with Google Calendar
- Add tasks from iGoogle
- Sign up free!
In June 2014 RTM (founded by Emily Boyd and Omar Kilani and launched in 2005) claimed over 5 million users.
We've developed apps for Android, iPhone, iPad, and BlackBerry 10; gadgets for Gmail and Google Calendar; sync with Microsoft Outlook and Evernote; adding tasks via email, Siri, and Twitter; and a bunch more!
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* Wikipedia mentions “Users must pay a subscription to synchronise among multiple devices more than once a day.”