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Free Tool
BayesLens Free
A basic Bayesian quick calculator for two common cases: a single-sample proportion and an independent-samples t-test. Free is designed for quick checks and light interpretation. Premium is where the fuller Bayesian support lives.
Choose your test and enter values
Pick the test you want, enter the required values, and generate a quick Bayes factor with a simple interpretation and plot.
Group 1
Group 2
Your result
This free version gives you a Bayes factor, a simple interpretation, and a quick visual. Check the output before using it in assessed work.
BF₁₀ = —
Your interpretation will appear here.
Your summary will appear here.
Free covers a basic single-sample proportion and independent-samples t-test. Premium is better when you need more Bayesian options, clearer write-up support, or less guesswork around the finer details.
What Premium does better
- Free: quick Bayes factor checks for two simple cases
- Premium: broader Bayesian support, more control, and stronger write-up value
- Premium: better suited to repeated coursework use and more serious reporting
Bayeslens Lite
Use Bayeslens Lite for quick Bayesian checks in psychology and social science work. This free Bayesian calculator offers simple Bayes factor support for common cases without dragging you into a full statistical existential crisis.
Reference: Rouder, J. N., Speckman, P. L., Sun, D., Morey, R. D., & Iverson, G. (2009). Bayesian t tests for accepting and rejecting the null hypothesis. Psychonomic Bulletin & Review, 16(2), 225–237.