Roll call is taken, in full
The teacher marks present, late and absent as usual. The entry is written on the device, not sent: it waits for the network. Nothing is lost if the phone shuts down.
Offline
Taking roll call when internet is not there
In many schools the connection drops in the middle of the morning, and the power with it. The teacher is standing in front of the class: they must be able to mark their students all the same, and have nothing to re-enter afterwards.
Sinidenw is built for these conditions — that is where it comes from. The product was born in Mali, for schools where the power cuts out and the connection drops: the app installs on the device, it keeps what the teacher needs, and it keeps working when the network goes away.
What works without a network
Sending up is automatic
As soon as the connection returns, the entries go up on their own. The screen says what is still waiting and what has been sent — never a counter that empties without anyone knowing what became of it.
What is already loaded stays readable
Student lists, the timetable and whatever the device has already received stay readable offline. It is what has been loaded, not the whole school.
Worth knowing
What does not work without a network
A page that only told the good half would be caught out by its first user. Here are the limits, as they are.
Notifications need the network
A notification that arrives when the app is closed goes through the internet: offline, it does not arrive. It will arrive when the network returns. It is the only feature of the product that does not work offline, and we would rather write it down.
The browser may clear what it keeps
The app asks the device to keep its data. The browser may refuse — in private browsing, or when memory runs short — and the app then says so plainly rather than letting anyone believe otherwise.
The first opening needs a network
A connection is needed to sign in the first time and to load your class. After that, the device keeps access for a month without a network.
And one point that matters: only roll call really works offline. Grades, homework and messaging can be read if they are already loaded, but they cannot be entered without a network. We do not promise what we have not built yet.
See how it works
The home page shows the whole sequence: roll call being taken, the network dropping, the entry going up when it returns.