JASP
Free, open-source statistics with classical and Bayesian analyses side by side
About JASP
JASP is a free, open-source statistical analysis program developed at the University of Amsterdam. It offers a spreadsheet layout and drag-and-drop interface for running both frequentist and Bayesian analyses, with results that update dynamically as you change options. Built on R, it covers everything from t-tests and ANOVA to structural equation modeling, meta-analysis, and machine learning, and version 0.98 adds JASP AI, a chat assistant that can run and interpret analyses.
Pros & Cons
Pros
- Completely free with no feature gating, which removes license costs for students and labs
- Bayesian versions of common tests are built in, not bolted on through extra packages
- Results update live as you change options, which makes exploring analysis choices fast
- APA-formatted tables paste straight into manuscripts
- Built on R, so the underlying methods match established R packages
Cons
- No scripting or syntax log comparable to SPSS syntax or R scripts for full automation
- Data management and cleaning tools are basic compared to SPSS or R
- Large datasets need substantial RAM (16 GB or more recommended)
- JASP AI requires your own API key from a model provider
Key Features
Frequentist and Bayesian Analyses
Run standard procedures in their classical form, their Bayesian form, or both, from the same menu.
Dynamic Results
Output updates instantly as you tick options or change variables, with no need to rerun syntax.
Drag-and-Drop Interface
Spreadsheet data view with drag-and-drop variable assignment and progressive disclosure of advanced options.
Broad Module Library
Modules for ANOVA, mixed models, regression, factor analysis, SEM, meta-analysis, network analysis, survival, time series, power, reliability, and machine learning.
APA-Formatted Output
Copy tables and graphs in APA format directly into Word or other documents.
Annotated Output
Add notes to results so analyses can be shared and explained alongside the numbers.
Open Science Framework Integration
Open and save .jasp files directly from OSF projects for transparent, reproducible research.
JASP AI
Optional chat assistant (bring your own OpenAI-compatible API key) that can create and run analyses, inspect results, and draft reports.
Cross-Platform and Offline
Runs on Windows, macOS, Linux, and ChromeOS without an internet connection.
Pricing
- All analysis modules
- Frequentist and Bayesian procedures
- Windows, macOS, Linux, ChromeOS
- Open-source under GNU AGPL v3
- No account or internet connection required
Best For
Psychology and Social Science Research
Run t-tests, ANOVA, regression, and reliability analysis with Bayesian alternatives for preregistered studies.
Teaching Statistics
Instructors use the free license and live-updating output to teach both classical and Bayesian inference.
Replacing Paid Point-and-Click Software
Labs that only need standard procedures replace SPSS seats with a free alternative.
Meta-Analysis and SEM
Researchers run meta-analyses and structural equation models through a GUI rather than R code.
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