Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For First Responders · SPC Control Chart

SPC Control Chart for a tolerance check

Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate a tolerance check live below — adjust the inputs and watch it respond, right in your browser.

SPC Control ChartLive

in control or not?

Controls

Speed1×

Presets

Process shift

Statistical process control watches a process over time against control limits set at three standard deviations from the target. Points inside are normal random variation — leave them alone. A point beyond the limits, or a run trending one way, signals a real change worth investigating. Nudge the process shift and watch points breach the limits.

▶ Run in Python

Data Inspector

Center line50

Control limits±3σ (44–56)

Out of control0

Governing equation

UCL, LCL = μ \pm 3 σ = 50 \pm 3 (2) = 56, 44

Reading this result: The process is centered on target: points scatter randomly inside the ±3σ limits, so every point is just noise — reacting now would only add variation (tampering).

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Frequently asked questions

Is this good for first responders?: Yes — this version of "SPC Control Chart for a tolerance check" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.