From their website:
“Remind is a free text messaging app that helps teachers, students, and parents communicate quickly and efficiently.
Accessible: With Remind, you can send text messages straight to any phone, including flip phones. To reach every family, translate your messages into more than 70 languages before you send.
Remind’s guidelines, practices, and features have been designed to protect the safety and security of users and their personal information. Remind has been certified by iKeepSafe for privacy practices related to COPPA, FERPA, and California Student Privacy.”