All-in-One Tools Collection

A broad collection of online tools for development, AI, design, and productivity tasks.

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Run chi-square goodness-of-fit or independence tests from observed counts or contingency tables

Compare two independent proportions with a pooled two-proportion Z test and confidence interval

Run an independent two-sample t test with pooled variance from raw data or summary statistics

Run Welch two-sample t tests for independent groups with unequal variances from raw data or summary statistics

Run one-sample Z tests for a mean with known population standard deviation or a single population proportion

Calculate Cohen d, Hedges g, Cohen h for proportions, or correlation r effect sizes from summary statistics

Estimate statistical power for one-sample mean or proportion tests using sample size, alpha, and expected effect

Analyze a WebP/VP8 image with Sharp, generate a grayscale displacement map, and render it as an interactive Three.js 3D relief surface

Calculate chi-square distribution PDF, CDF, and right-tail probability from a statistic and degrees of freedom

Calculate exact and cumulative probabilities for sampling without replacement

Calculate Student t distribution PDF, CDF, tail probability, two-tail probability, and central area

Calculate PDF, CDF, survival probability, and interval probability for a continuous uniform distribution