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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| Datablistdatablist.com | Mockaroomockaroo.com | Datawrapperdatawrapper.de | DuckDB Web Shellshell.duckdb.org | |
|---|---|---|---|---|
| What it does | Spreadsheet built for cleaning and deduplicating messy list exports | Generates realistic fake test data in CSV, JSON or SQL | Turns a pasted table into a publication-quality chart in four steps | Run SQL over your own CSV or Parquet file without uploading it |
| What it costs you | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. | No sign-upWorks the moment the page loads. No account, no email, no trial. |
| Your files | Runs on their server | Runs on their server | Runs on their server | Runs on your device |
| Where it stops | Requires an account, data is stored on their servers, and the free plan caps items per collection. | Free downloads are capped at 1,000 rows and 200 API requests a day. | Free charts are public, keep the Datawrapper credit, and export as PNG only — SVG and PDF need a paid plan. | Nothing persists between sessions, and very large files are limited by the browser's available memory. |
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| Category | Data, Tables & Charts | Data, Tables & Charts | Data, Tables & Charts | Data, Tables & Charts |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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