Gwet's AC1 Agreement — free, runs in your browser
Agreement between two raters on nominal categories. AC1 avoids the kappa paradox (high agreement but low κ) when categories are very imbalanced, and is … Computed in your browser — no data uploaded.
Open free tool →Runs in your browser
No software installation. Paste your data and get results instantly.
Publication-ready output
Export charts as SVG vector or HD/UHD PNG suitable for journal submission.
Data stays local
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Common questions
When should I use Gwet's AC1 Agreement?
Agreement between two raters on nominal categories. AC1 avoids the kappa paradox (high agreement but low κ) when categories are very imbalanced, and is more robust than Cohen's κ. Reports AC1 and κ side by side with bootstrap 95% CI.
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 Gwet's AC1 Agreement now
Agreement between two raters on nominal categories. AC1 avoids the kappa paradox (high agreement but low κ) when categories are very imbalanced, and is … Computed in your browser — no data uploaded.
Open free tool →Free to use. No account required. No data uploaded.