NativePrep

Free Windows beta · 1.0.5-beta.2

Messy spreadsheets.
A clear way forward.

Clean and combine CSV and Excel files in a visual desktop workspace. Save your steps, review the result, and run the same flow next time—all on your computer.

Download Windows betaPortable ZIP
Windows x64No account requiredLocal processing by default
NativePrep workspace showing a sample visual pipeline for cleaning, filtering, and exporting data
NativePrep workspace · sample data

Clean once. Reuse the flow.

Save a visual workflow for the next client export or monthly report. Keep each transformation visible and editable.

See what changed.

Inspect rows, column types, and profiles as you clean, filter, join, and reshape your files.

Work on your own computer.

Import, processing, and exports run locally by default. External AI is optional and disabled by default.

From file to finished output

Three steps. A flow you can repeat.

  1. 01

    Import your files

    Bring in CSV, Excel (.xlsx), Parquet, or JSON. Start with built-in samples to explore first.

  2. 02

    Build and inspect

    Connect cleaning, filtering, joining, and aggregation steps. Inspect the data as you work.

  3. 03

    Export and reuse

    Export the prepared result and save your project. Relink source files when the next batch arrives.

Help shape NativePrep

Try it on your next data task.

This beta is free. We’re looking for analysts and small teams who regularly prepare files for reports. Tell us what worked, what was confusing, and what stopped you.

Download Windows betaPortable ZIP
Installation guideRelease notes & checksumsReport a bug or share feedback

Before you start

  • Windows x64. Installer or portable ZIP; macOS and Linux downloads are not available yet.
  • Unsigned beta. Windows may display a publisher warning. Check the release and checksum before deciding to run it.
  • Try samples or copied files first. Keep original datasets and project backups.
  • Import limit: 1 GiB per file. Large CSV and Excel files can need substantially more memory than their file size.
  • Portable use. Extract the entire ZIP, then run the application from the extracted folder.

Your files have a place. Your computer.

NativePrep’s default workflow does not upload source datasets to a hosted service. Optional external AI requires a separate opt-in. This website serves product information and downloads; the desktop app does the data work.