Remind

Remind is the absolute, unquestioned, massively dominant 800-pound gorilla of the entire Classroom Messaging space. It originally exploded into popularity because it solved a massive legal and ethical nightmare: teachers desperately needed to text their students to remind them about homework, but texting a teenager from a personal cell phone is a massive legal liability. Its signature feature is "Phone Number Masking." When a high school teacher uses Remind to text a massive marching band, the students receive a standard SMS text message. But the student never sees the teacher's real phone number, and the teacher never sees the student's real phone number. All traffic is routed securely through Remind's servers, legally archiving every single message for school district compliance. Because its adoption is staggering (used in almost 80% of US public schools), it operates at a massive enterprise level. While individual teachers use it for free, a massive school district buys the "Remind Hub." This allows the District Superintendent to hit one button and blast a terrifying emergency lockdown text message to 50,000 parents, teachers, and students simultaneously, instantly bypassing the school's clunky email system.