Planning & organizing tools
Seating charts, gift exchanges, tournament schedules, fair matching, routes and elections — real optimization, not spreadsheets.
Most popular
Round-Robin Schedule Generator
Everyone plays everyone: fixtures by the circle method, byes included.
popular
Seating Chart Optimizer
Assign guests to tables around keep-together and keep-apart rules.
popular
Secret Santa Generator
Draw gift-exchange pairs with exclusions, no self-draws guaranteed.
popular
Voting Methods Lab
Drag candidates on an opinion map and watch plurality, runoff, Borda and Condorcet crown different winners.
Events & Groups
Tournaments & Scheduling
Matching & Routes
Elections & Voting
Projects & Work
Box & Bin Packing Calculator
How many boxes, bins or trucks? First-fit-decreasing packing by capacity or 3D size.
Critical Path (CPM/PERT) Calculator
Which tasks actually set the deadline — schedule, slack and critical path from a task list.
WIP Limits & Little’s Law Simulator
Watch a kanban board run: raise the WIP limit and see cycle time explode while throughput stalls.
Weighted Decision Matrix
Score your options against weighted criteria — with a sensitivity check on the winner.
About these tools
Planning and organizing tools for groups and events: seating charts, Secret Santa gift exchanges, tournament brackets, round-robin schedules, fair task rotas, matching problems and several voting methods. The algorithms behind each planner are documented, so the outcomes are transparent and reproducible.