https://web.seesaw.me/ 

Seesaw saves time on organization and parent communication, makes formative assessment easy, and provides a safe place to teach 21st Century skills.
QR code connection, available across mobile devices

Alternatives:

Google Classroom https://classroom.google.com/

Quizzlet https://quizlet.com/

Showbie https://www.showbie.com

alternatives for student portfolios:

https://www.commonsense.org/education/blog/top-11-apps-and-websites-for-student-portfolios

https://www.commonsense.org/education/blog/edtech-quick-take-seesaw-vs-freshgrade

two popular digital-portfolio apps: Seesaw and FreshGrade.

See Saw digital learning journal.

See Saw digital learninurnal. https://www.symbalooedu.com/