Tools

Simple utilities for sizing experiments, evaluating impact, and explaining models. No sign-up required.

Statistics

Classification Metrics Calculator

Enter confusion matrix counts to compute precision, recall, F1, specificity, MCC, likelihood ratios, and more.

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Relative & Absolute Difference Calculator

Compute absolute difference and relative (percent) change between two values.

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Statistical Power Calculator

Calculate the statistical power of your experiment to determine the probability of detecting an effect if one exists.

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Effect Size Calculator

Calculate Cohen's d, odds ratios, and other effect size measures to quantify the magnitude of differences between groups.

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Confidence Interval Calculator

Calculate confidence intervals for means and proportions to estimate population parameters with specified confidence levels.

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T-Test Calculator

Perform one-sample, two-sample, or paired t-tests to compare means and determine statistical significance.

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Z-Score & Percentile Calculator

Compute the z-score and percentile of a value assuming a normal distribution.

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Causal Inference

Synthetic Control Analysis

Upload panel data (long or wide), select treated units and intervention date, and visualize synthetic control results with placebo-based confidence intervals.

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Utilities

State Machine Visualiser

Enter nodes and probability edges (via JSON) to visualize a state machine and validate its correctness.

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SQL Query Explainer

Submit your SQL query and get an AI-powered explanation. Perfect for learning, debugging, or understanding complex queries. Requires authentication.

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Tools

Statistics

Classification Metrics Calculator

Relative & Absolute Difference Calculator

Statistical Power Calculator

Effect Size Calculator

Confidence Interval Calculator

T-Test Calculator

Z-Score & Percentile Calculator

Causal Inference

Synthetic Control Analysis

Utilities

State Machine Visualiser

SQL Query Explainer

A/B Testing

A/B Test Results Visualizer

Sample Size Calculator

A/B Test Duration Calculator