Lab
Scheduler sandbox
Ask for a session in your own time zone and watch the engine turn down times one by one, with its reasons.
Workload forecaster
Set the weekend's graders and new work, pick a forecast idea, then reveal Monday and see it scored.
Time-zone message checker
Break a session message by changing the zone or the hour, and watch which check fails and why.
Course matcher
Type a course title and a few chapter titles, and see the most similar courses vote on where it belongs.
Gap finder
Paste two lists and see a count and a fingerprint for each, then every difference grouped by its likely reason.
Grader's panel mock
A pretend grading page with the panel open beside it: pick a lesson and watch its files appear.
Safe-write sandbox
Stage a batch of changes on a made-up table, approve it, and watch the checks; try to delete a row and see it flagged.