statzel — Statistical analysis in your browser

Statzel is a free statistics app that runs entirely inside your browser tab. Open a spreadsheet, pick a test from the menubar, and read the result — with the plot, the effect size and the confidence interval, not just a p-value. Because every method is computed on your own machine, nothing is uploaded to a server, which makes it usable for patient data, lab results and anything else you could not put through a website.

It is built for the work that usually needs an expensive licence, across fields that rarely share one tool. Clinical and laboratory work gets method comparison and the CLSI EP protocols, diagnostic accuracy and ROC, survival models and reference intervals. Econometrics gets panel models with fixed and random effects, instrumental variables, unit-root and cointegration tests, ARIMA forecasting and GARCH volatility models. The social sciences get factor analysis and structural equation models; process engineering gets SPC and capability. If you are not sure which test you need, the field guides take you from the question to the method in plain language.

Alongside the classical toolbox you get Bayesian counterparts of the standard tests (including informative hypothesis testing), the full SEM family (lavaan syntax, CFA, latent growth, PLS-SEM), a supervised machine-learning module, psychometric network analysis, meta-analysis with Mantel–Haenszel and Peto pooling, and quality control from gauge R&R to acceptance sampling.

Ten field guides cover every method in the catalog — start with Starting out for describing and plotting your data, or jump to your field: clinicians & epidemiologists, lab & IVD specialists, econometricians, social scientists, quality engineers, data scientists, bench scientists, and market analysts.

What's inside

261 statistical methods grouped into 9 top-level menus. Click a heading to jump straight to the relevant section of the method index.

How it works

• Open or import data. Paste straight into the sheet, or use Data → Import file for CSV / TSV (plain or gzipped), Excel, Parquet, R .rds, SAS .sas7bdat and .xpt, Stata .dta, and SPSS .sav.
• Pick a test from the menubar. Each test opens a Configure modal where you pick columns and options.
• Run. Computation runs in a background worker, so the UI never freezes — even on heavy fits.
• Read the result. Test statistics, effect sizes, CIs, and (where relevant) interactive plots render in the result pane.

Privacy

Every analysis runs entirely inside this browser tab. Your data is never uploaded, and nothing is installed on your computer. The statistics engine and any components it needs are downloaded once and cached in your browser, so later runs are instant.