Springpad, a productivity app that struggled to stand out from similar offerings from Evernote and Pinterest, is planning to close its doors, The Verge has learned. The six-year-old Boston company, which raised more than $7 million, had around 400,000 people using its digital notebooks to save tasks, notes, checklists, and more. But it never came close to matching the momentum of Evernote, which said this month that it now has over 100 million users. Its unclear when the service will end or how Springpad plans to tell its users, but the move appears imminent, according to a person familiar with the companys plans.