BioStat Lab
Sample Size & Power Calculator
$0.99 · Designed for iPad. Not verified for macOS.
Sample size & power for t-test, ANOVA, proportions, correlation, and survival. All offline. No account needed. Built for biomedical research.
BioStat Lab is a precise, offline statistical power and sample size calculator designed for biomedical researchers, clinicians, and students.
CALCULATORS INCLUDED
t-Test — Independent & Paired
Calculate the required sample size for independent-samples or paired t-tests. Enter mean difference, standard deviation, significance level (α), and desired power (1−β).
ANOVA — One-Way
Determine per-group and total sample size for a one-way ANOVA across 2–20 groups. Uses Bonferroni-adjusted alpha for multiple-comparison control.
Proportions — Two-Proportion z-Test
Compare two event rates or response proportions. Displays absolute difference and risk ratio alongside the required sample size per group.
Correlation — Pearson r
Sample size for testing whether a Pearson correlation is significantly different from zero. Uses Fisher z-transformation for accuracy. Includes Cohen's effect-size classification.
Survival — Log-Rank Test
Event-driven sample size for survival studies using Freedman's formula. Enter hazard ratio, expected event rate, α, and power to get required events and total subjects.
DESIGN PHILOSOPHY
Dark space-inspired interface — deep indigo background, violet accent readouts, monospaced numeric displays — optimized for focused scientific work.
PRIVACY
No account required. No data collected. All calculations happen on-device.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, 长贵 周, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 长贵 周
- Size
- 2.6 MB
- Category
- Medical
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 8 more
- English, French, German, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2025 Aikoi
