StatMate is a free online statistics calculator that provides 20 statistical tests with APA 7th edition formatted results, designed for students and researchers needing instant, publication-ready output without SPSS or manual formatting.
What is StatMate?
StatMate is a free, no-sign-up-required web-based statistical tool that accepts raw data or summary statistics and outputs test statistics, p-values, effect sizes, and APA-formatted sentences. It runs entirely client-side in the browser, ensuring data privacy. Developed by statisticians and trusted by over 500 researchers, StatMate is built with Next.js and is open source on GitHub.
Key Features
- 20 statistical tests — Including independent and paired t-tests, one-way and two-way ANOVA, repeated measures ANOVA, Mann-Whitney U, Wilcoxon signed-rank, Kruskal-Wallis, Friedman, chi-square, Fisher's exact, McNemar, Pearson and Spearman correlation, simple and multiple regression, logistic regression, factor analysis, Cronbach's alpha, and sample size/power analysis.
- APA 7th edition formatting — Results are automatically formatted in APA style, including the test statistic, degrees of freedom, p-value, effect size (Cohen's d, eta-squared, Cramer's V, odds ratios), and confidence intervals. Ready to copy into a paper.
- AI interpretation (Pro feature) — Get a plain-language explanation of results and a paper-ready sentence, such as "An independent-samples t-test revealed that participants in the experimental condition scored significantly higher..."
- Export to Word — One-click export of APA tables to .docx format (Pro feature). Also supports clipboard copy and PDF export.
- Validation against R and SPSS — All calculators are cross-validated to at least 4 decimal places against R and SPSS, ensuring accuracy.
- Client-side privacy — All calculations run in the browser; no data is uploaded or stored on servers.
- Interactive charts — Includes scatter plots with regression lines, interaction plots, and more visualizations.
- Assumption checks — Tests like sphericity, homoscedasticity, and normality are included where relevant.
Who is it for?
- Psychology master's students — Run an independent-samples t-test for thesis data and directly copy the APA-formatted output into their paper, saving hours of manual formatting.
- Research methods instructors — Use StatMate in class to demonstrate statistical tests; students enter sample data and instantly see APA results, making abstract concepts concrete.
- PhD candidates — Run multiple tests (t-test, ANOVA, correlation, chi-square, regression) for a dissertation and export all results to Word in APA format with one click each.
- Researchers needing quick exploratory analysis — Test data with multiple statistical methods quickly without installing software.
What can you do with StatMate?
- Run common parametric tests: Compare two groups with a t-test, compare three or more groups with one-way or two-way ANOVA, or analyze repeated measures.
- Run non-parametric alternatives: Use Mann-Whitney U, Wilcoxon signed-rank, Kruskal-Wallis, Friedman, Fisher's exact, or McNemar tests when assumptions are violated.
- Model relationships: Perform simple or multiple linear regression, logistic regression, or correlation analysis, complete with scatter plots and regression lines.
- Assess reliability and structure: Calculate Cronbach's alpha for internal consistency or conduct exploratory factor analysis with rotation options.
- Power analysis: Use the sample size calculator to determine required sample sizes for t-tests, ANOVA, correlation, chi-square, and proportions.
How does StatMate work?
- Enter your data — Paste raw data (comma-, space-, or newline-separated) or enter summary statistics. Supports CSV upload.
- Get APA results — Click Calculate and receive the test statistic, p-value, effect size, and confidence interval, all formatted in APA 7th edition.
- Export and cite — Copy results to clipboard, export APA tables to Word (Pro), or use the AI interpretation for plain-language summaries (Pro).
Pricing
StatMate is free for all 20 statistical calculators. Pro features, including AI interpretation and Word export, are available for $5.99 per month.
FAQ
Is StatMate really free?
Yes, all 20 statistical calculators are completely free with no sign-up required. Pro features like AI interpretation and Word export are available for $5.99/month.
How accurate are the results?
Every calculator is cross-validated against R and SPSS to at least 4 decimal places. The formulas come from established statistics textbooks.
Does StatMate store my data?
No. All calculations run entirely in your browser. Your data never leaves your device and is not uploaded, stored, or logged on servers.
You can copy results to clipboard or export APA-formatted tables to Word (.docx) with one click (Pro feature). PDF export is also available.
Which statistical tests are included?
StatMate offers 20 tests: t-tests (independent, paired, one-sample), ANOVA (one-way, two-way, repeated measures), non-parametric tests (Mann-Whitney, Wilcoxon, Kruskal-Wallis, Friedman, Fisher's exact, McNemar), regression (simple, multiple, logistic), correlation (Pearson, Spearman), chi-square, factor analysis, Cronbach's alpha, and sample size/power analysis.
