Datok

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Datok is a data preparation and analysis tool for people who work with files rather than warehouses. You build a workflow by dragging tools onto a canvas — read a file, join it, clean it, summarise it, write it out — and watch the rows change at every step. There are 45 tools, including joins, fuzzy matching, dedupe, regular expressions, text-to-columns and multi-row formulas. Then you pivot the result: rows, columns and values on drag-and-drop shelves, with percent of row, column and grand total, totals you can place or switch off, and per-measure number formats. From there, 41 chart types, from bar and line through to Sankey, sunburst, org charts and cartograms, arranged as dashboards with their own filters. Processing happens on your own computer. The browser version processes your files in the browser; the Windows desktop app runs a local server on your machine. Your data is never uploaded to Datok, so there is no conversation to have with anyone about where it is stored. Saved work lives in your own folder as a single file, with version history kept alongside it. The browser version reads Excel, CSV, JSON and SQLite. It needs Chrome, Edge or Opera, and does not work on phones or tablets. The Windows desktop app adds Parquet, Avro, Tableau .hyper extracts and Alteryx .yxdb files, and optional local AI features through Ollama — free third-party software you install yourself — rather than a cloud service. One plan, EUR 19.97 a month including any applicable VAT, cancelled whenever you like. The first eight hours of the web version are free; the desktop app needs a subscription. The interface is available in 23 languages. Made by OmNexis s.r.o. in the Czech Republic.