Normality / Homogeneity of Variance — free, runs in your browser
Assumption checks before t-test or ANOVA: Shapiro–Wilk normality (with Q–Q plot) plus Levene and Bartlett variance-homogeneity tests, to decide parametr… Computed in your browser — no data uploaded.
Open free tool →Runs in your browser
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Publication-ready output
Export charts as SVG vector or HD/UHD PNG suitable for journal submission.
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Common questions
When should I use Normality?
Assumption checks before t-test or ANOVA: Shapiro–Wilk normality (with Q–Q plot) plus Levene and Bartlett variance-homogeneity tests, to decide parametric vs non-parametric methods. Shapiro–Wilk uses the Royston (1992) algorithm.
Is my data safe?
All calculations run entirely in your browser. No data is sent to any server. You can even use the tool offline after the page loads.
Run Normality now
Assumption checks before t-test or ANOVA: Shapiro–Wilk normality (with Q–Q plot) plus Levene and Bartlett variance-homogeneity tests, to decide parametr… Computed in your browser — no data uploaded.
Open free tool →Free to use. No account required. No data uploaded.