Statistics that respect your data
Professional-grade statistical analysis — t-tests, ANOVA, correlation, regression, and more. Every computation runs entirely in your browser. Your data never leaves your device.
Descriptive Statistics
Summarize and explore your data
T-Tests
Compare means between groups or against a standard
ANOVA
Compare means across three or more groups
One-Way ANOVA
Compare means across multiple groups with post-hoc Tukey HSD
Two-Way ANOVA
ProAnalyze main effects and interactions in factorial designs
Repeated Measures ANOVA
ProCompare means from the same subjects across conditions
Correlation & Regression
Measure relationships and predict outcomes
Pearson Correlation
Measure the linear relationship between two continuous variables
Spearman Correlation
Rank-based correlation for monotonic relationships
Linear Regression
Fit a line to predict Y from X, with R² and significance tests
Multiple Regression
ProPredict Y from multiple predictors with partial coefficients
Logistic Regression
ProModel binary outcomes with odds ratios and classification
Non-Parametric Tests
Distribution-free alternatives when assumptions are violated
Mann-Whitney U Test
Non-parametric alternative to independent t-test for ordinal data
Wilcoxon Signed-Rank
Non-parametric alternative to paired t-test
Kruskal-Wallis Test
ProNon-parametric one-way ANOVA for ranked data
Friedman Test
ProNon-parametric repeated measures for ranked data
Categorical Data
Analyze frequencies and proportions
Chi-Square Test
Test independence in contingency tables with expected frequencies
Fisher's Exact Test
ProFor 2×2 tables with small expected frequencies
Advanced (Pro)
Specialized methods for complex research designs
Power Analysis
ProCalculate required sample size for your study design
Factor Analysis / PCA
ProReduce dimensionality and discover latent constructs
Survival Analysis
ProKaplan-Meier curves and log-rank tests for time-to-event data
Time Series (ARIMA)
ProModel and forecast temporal data with autocorrelation
Why StatPro
SPSS power without the price tag
Professional statistics tools that run privately in your browser. No $1,000 licenses, no data uploads.
Complete privacy
All calculations happen locally in your browser. Your research data never touches a server — critical for IRB compliance and confidential datasets.
Instant results
No waiting for server processing. Enter your data, click calculate, get results with APA formatting, effect sizes, and step-by-step breakdowns immediately.
Transparent pricing
Free for casual use. $3/month for unlimited access to all current and future tests. No per-analysis fees, no hidden limits.