Data Diff – compare tables of any size across databases

In plain words

Data Diff is an open-source tool that compares tables of any size within and across databases. Built by Datafold, it helps data engineers identify differences in data when testing ETL changes or migrations. The tool shows how values and aggregate metrics change, making it useful for regression testing and validating data integrity across different database systems.

written from the facts on this page · September 2026

From the sources

In the maker’s words, at launch

Gleb, Alex, Erez and Simon here – we are building an open-source tool for comparing data within and across databases at any scale. The repo is at https://github.com/datafold/data-diff, and our home page is https://datafold.com/. As a company, Datafold builds tools for data engineers…

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  data-diff2022 · github.com · ▲63

  Compare tables of any size across databases

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  Diff.io2015 · diff.io · ▲194
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  data-diff2022 · github.com · ▲10

  Efficiently diff data in or across relational databases

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