Online note-saving platform Evernote suffered serious disruption after suffering a distributed denial of service (DDoS) attack that began on Tuesday.
A large number of members were temporarily unable to sync their notes between devices during the attack. Last month Evernote announced that they have more than 100 million users.
Spokeswoman Ronda Scott told the BBC that the cyber assault, caused by an unknown perpetrator, began at 14:25 local time [22:25 BST] on Tuesday and had not yet ended.
“We continue to mitigate the effects of the attack, but have successfully returned Evernote to service,” she added.
“As is the nature of DDoS attacks, there was no data loss, and no accounts were compromised.”
While this attack was limited in terms of damage, it’s not the first time the California-based company has suffered a cyber attack. In 2013 they announced that hackers had managed to access user names, email addresses and encrypted passwords.