Featured in Domain Arrivals · 2026-08-12
Lukkari, a Finnish School Timetable Solver
A browser-based scheduling tool that builds school timetables around teachers, groups, rooms, subject hours, double lessons, and simultaneous teaching blocks.
Why it surfacedLukkari uses OR-Tools CP-SAT constraint solving to handle the parts of a school timetable that usually turn into spreadsheet combat: teacher conflicts, room capacity, demanding subjects after 1 p.m., free periods, and groups that must study together. Teachers can lock a lesson, solve again, and export or import the entire school configuration as JSON.
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Ice Does Not Count
August 12’s newborn domains include a rule-bound archive of enormous sodas, 27 family stories cut from one afternoon, a disaster-supply map with a 24-hour freshness rule, and an ocean bell that rings only when six conditions agree.
This is one of 1,000 discoveries in the 2026-08-12 Domain Arrivals issue.