Free tools

21 tools, games and explainers. Each one runs in your browser, shows its arithmetic, and sends nothing to us.

Lean Six Sigma

Calculators for the numbers a process improvement project runs on.

Lean Six Sigma toolkitthe five calculators below, and the order to use them in.
Control chart makerI-MR, c and p charts with the four Western Electric run rules.
Process capability calculatorCpk with its confidence interval, a Cpk against Ppk drift check and a normality test.
Sigma level calculatorDPMO and sigma level with the 95% interval, and whether a kaizen really cut defects.
Takt time calculatortakt time, line balance and the bottleneck.
OEE calculatorOEE with each loss in minutes, and the one fix worth most.

Play them before a lesson. Each one teaches by letting you get it wrong.

Bottleneck Burgeran idle game that teaches takt time, the theory of constraints, the eight wastes and 6S by playing them.
Back It Inback a 53-foot trailer into a dock door by dragging the wheel, and find out why drivers get out and look.

For cycle counts and line checks.

Count clickera free tally counter for cycle counts and line checks, with a CSV of every tap.
Cycle count plannerpaste your item list, get ABC classes and a balanced counting schedule.

One idea each, worked through as you scroll.

Where an Order Spends Its Timeone order, quote to invoice, at one pixel per minute.
All 100 County Seatsa route through North Carolina's 100 county seats, untangled as you scroll.
If a CPU Cycle Took One Secondcomputer waiting times rescaled until one processor cycle lasts a second.
Throwing Darts at PiMonte Carlo simulation, from pi to whether an order ships on time.
Your Spreadsheet as a Cityone bad formula in a quoting workbook, and how far the damage travels.
Seven Years to a Fraser Firone acre of Christmas trees and the cash it holds before anything sells.
Murphy to Manteo, to ScaleNorth Carolina at one mile to 40 pixels, elevation, counties and economy.

Everything else.

SEO ROI calculatorpayback month, CAC, LTV to CAC and the return over 36 months.
Simulation speed testfour classic physics kernels, run on your own GPU and CPU.
AI leadership type quiztwelve work scenarios sort you into one of eight AI leadership types, with a card to post on LinkedIn.
Self-order kioska touch ordering screen, working in the page. The menu and prices are invented, so the totals show the arithmetic and not a cost.