Share a homework list with your class

Everyone in the room copies the same thing off the same board. In Study Hall one person adds it and the rest of the class gets the offer — with their name on it, so a wrong date is traceable rather than anonymous.

1. 1. Sign in, pick a display name, and open Friends.
2. 2. Under Classes, make one — “AP Chemistry” — and you get a code like ABCD-2346.
3. 3. Send the code to people who take it with you. They enter it under Join a class.
4. 4. Anyone in the class can share one of their assignments with it.

A shared item sits in a tray until you press Add. That's the whole design: if items landed automatically, one person's mistyped date would become everyone's wrong due date, and nobody would know where it came from. Once you accept it, the copy is yours — rename it, move it, tick it off. Ticking it off tells nobody.

Only a title, a kind, a course and a date cross between accounts, plus the display name of whoever added it. Your notes, your grades, your email address and whether you've done anything stay on your side. That list is enforced in code rather than by habit: anything not named is dropped, so a field added to the planner later can't start travelling between accounts by accident.

• — Only people with the code can join, and the owner can issue a new code at any time.
• — The owner can remove someone, which also takes anything they shared out of everyone's tray.
• — Joining doesn't hand you three months of backlog. You get what happens from then on.
• — Closing a class removes it for everyone, but nobody loses what they've already added.

It's part of Study Hall, a free planner for homework, classes and sport. This feature needs an account for everyone taking part, since a class is shared between them — the planner itself works signed out. What it stores