For quality engineers, Six Sigma Green and Black Belts and students. Paste measurements or scan a check sheet; get control limits, rule violations and Cpk with a plain-English verdict. Free plan, Pro $29 one-time.
A startup from Kernersville, the United States, founded by Nicholas Williford.
This page is designed to help you find out whether LimitLine is good and if it is the right choice for you.
LimitLine is statistical process control (SPC) software that runs in the browser. Paste measurements from Excel or scan a check sheet, and it builds the control chart, flags special-cause signals and calculates process capability, with a plain-English verdict and next step for every result.
Every Pro chart and tool can be tried on its built-in example before buying.
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JavaScript running fully in the browser, Cloudflare Pages and Pages Functions for hosting, Stripe for payments, Ed25519-signed license keys verified with Web Crypto, PDF.js and Tesseract.js for reading documents and images on the device, and Resend for email.
LimitLine was built by Nicholas Williford, a Lean Six Sigma Black Belt, after repeatedly seeing people stuck without access to statistical software when they needed a quick control chart or Cpk. The product was designed from 109 real complaints about existing SPC tools, the biggest being price and licensing, knowing which chart to use, and getting data in. It launched in October 2026.
It runs entirely in the browser with nothing to install, and the data never leaves the user's device. Every result ends with a plain-English verdict and a next step, not just numbers. Its calculations are checked against the NIST/SEMATECH handbook's worked examples on every release, with the results published at limitline.org/validation. Pro is a one-time $29 license instead of an annual subscription.
Desktop SPC packages typically cost hundreds of dollars or more per user each year, need an install that IT has to approve, and assume the user already knows which chart to pick. LimitLine has a free plan with no sign-up, a one-time Pro license, works on any computer including Chromebooks and locked-down PCs, and guides the user to the right chart. It covers the everyday SPC and Six Sigma toolkit; it is not a full statistics package for advanced modeling.
Quality engineers and supervisors at small and mid-size manufacturing plants, especially where one Minitab license is shared or there is none; Lean Six Sigma Green and Black Belt candidates working on projects or exam prep; and trainers who teach SPC on classroom or training-room computers.
We have collected here some useful links to help you find out if LimitLine is good.
Check the traffic stats of LimitLine on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of LimitLine on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of LimitLine's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of LimitLine on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
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