JASP vs Celeus: how the two tools compare
JASP is a free, open source desktop app with classical and Bayesian analyses. Celeus is a browser service that suggests methods. Dated facts, linked to sources.
Written by Celeus, which makes one of the two tools compared. Facts about JASP come from JASP's own pages and were last checked on .
JASP is a free, open source statistics application. Its standard analyses come in two forms, classical and Bayesian, and you set them up by drag and drop in a spreadsheet layout. It installs on Windows, macOS, Linux and ChromeOS and needs no internet connection. A recent release added JASP AI, a chat assistant that can set up and run analyses using a model service the user connects.
Celeus is a hosted service rather than an installed program. You upload a dataset in the browser, Celeus proposes methods that match its columns and design, and every analysis is computed in R with a fixed seed. The AI model helps with suggestions and plain-language interpretation, and it never receives data rows. Each run can be downloaded with its R script and audit log.
If Bayesian analysis or fully local work matters most, JASP is built for that. If the hard part is deciding which method fits and documenting the analysis for a reviewer, that is where Celeus focuses.
At a glance
| What we compared | JASP | Celeus |
|---|---|---|
| Price and free tier | Free to download and use. (JASP, as of ) | Free plan; Pro is $19 a month for one researcher. |
| Where it runs | A desktop app for Windows, macOS, Linux and ChromeOS that runs without an internet connection. (JASP, as of ) | In a web browser. No desktop app and no offline mode. |
| How the method is chosen | You set up analyses by drag and drop in a spreadsheet layout. (JASP, as of ) | Celeus suggests methods that fit your dataset's structure, and the AI suggests a test when you ask for one. The statistics run in R, not in the AI model. |
| AI involved, and what of your data reaches it | JASP AI connects to any OpenAI-compatible model service, such as OpenAI, Anthropic, Mistral, OpenRouter or a local model, and uses tool calling to work with JASP. (JASP, as of ) | The AI model receives: column names, types and variable labels stored in your file; summary statistics, including each numeric column's minimum and maximum; category names, with small counts withheld; aggregate results of your analyses; text you write: chat messages, research questions, notes and codebook descriptions; dataset names (by default, the name of the file you uploaded). It never receives: your uploaded file; data rows or data tables. |
| Reproducibility output | Results can show the R syntax behind an analysis, and there is a syntax mode. (JASP, as of ) | The plan, the exact R script, the seed, session info, the results and the audit log, in one download. |
| File formats it opens | Opens CSV, TSV and text files, SPSS, SAS, Stata and Excel files, R data files and Minitab files. (JASP, as of ) | CSV, TSV or Excel on every plan; SPSS, Stata and SAS on paid plans. |
| Breadth of methods | Standard analyses, each in a classical and a Bayesian form. (JASP, as of ) | 40 statistical methods. |
| Licence | Open source: the engine is under GNU GPLv2 and the desktop interface under GNU AGPLv3. (JASP, as of ) | Proprietary hosted service. |
Who each tool suits
JASP: Researchers and students who want classical and Bayesian results side by side in a free program that runs locally, and who are comfortable choosing each analysis themselves.
Celeus: People who want a starting point for the analysis: a hosted service that reads the dataset's structure, proposes suitable methods, and records each run so someone else can repeat it.
Where JASP is the stronger choice
- Bayesian versions of standard analyses sit right next to the classical ones. (JASP, as of )
- It runs on your own computer, needs no internet connection, and does not upload datasets to cloud services run by JASP. (JASP, as of )
- It is free and open source, under a licence chosen so the project cannot take the software away from its users. (JASP, as of )
- Specialised modules cover areas such as audit, quality control, machine learning, meta-analysis and structural equation modelling. (JASP, as of )
JASP is a trademark of its owner. Celeus is not affiliated with, sponsored by or approved by the owner of JASP; the name is used only to identify the product being compared.