Statistical process control · in your browser

LimitLine

Control charts, special-cause rules and capability. Paste from Excel or drop a CSV. Every calculation runs on this page; only alert emails leave it.

Analysis tools

At the machine

Measure the part, type the value, press Enter.

    Each part goes into the Individuals chart, in order. Self-check is the fastest feedback: the person who made the part knows at once whether it is good.

    Floor board

    Recent analyses

    Your last 10 analyses, saved automatically when you press Analyze. They stay in this browser only: nothing is uploaded, and clearing your browser data removes them. To keep one for good, use Save project.

    My charts

    Keep the charts you update every day or week. Open one, add the new readings, press Analyze, then Save changes. They stay in this browser only: nothing is uploaded. For a copy on another computer, use Save project.

    All charts and tools

    For an email to [email protected]: version, browser, plan and recent errors. No data, key or email address.

    One value per line, or separated by commas or spaces. Paste a column from Excel or drop a CSV here.

    Line, part and owner

    One name, or one line per machine or shift (Press 3: Ann), matched to the labels in your data.

    Pro Plus, Team and Expert: emailed automatically at Review ASAP and Action needed. Other plans: “Email the support team” opens your mail app with the alert filled in.

    Shown first under Respond on every alert, in the alert email and on the one-page PDF. Saved in this browser and in project files.

    Start-of-run check

    Check the conditions before the first part (source inspection): problems caught here never become bad parts.

    Special-cause rules (Nelson)

    Customize charts
    Settings are saved in this browser only. A plant standard file shares them with the team; no server is needed.
    Data on your work computer? Email yourself the link

    Individuals chart

    Download

    Limits and verdict

      Moving range chart

      Distribution

      Scan from image or file

      Choose an image or file to start.
      Or paste text from your phone

      iPhone: open the photo, press and hold the numbers, Copy. Android: Google Lens → Text → Copy. Paste below.

      Check: low confidence or a letter was fixedNot a number

      The numbers it reads appear here. Fix any cell before you insert.

      Free: 1 scan a day. Pro and Student: 20 a day. Pro Plus, Team and Expert: no limit. "Read numbers" runs on your device; images and files are never uploaded.

      Methods: NIST/SEMATECH e-Handbook of Statistical Methods — Individuals, X̄-R and X̄-S, c and p charts, capability. Every release is tested against NIST's worked examples. Cp and Cpk on the chart tabs assume a stable, roughly normal process; for skewed data use Capability+. LimitLine calculates statistics; it does not certify a process.