Lake3Tools CSV Compare desktop app - Compare CSV files with 10s of millions of rows in seconds.

Compare massive CSV files in seconds, even with mismatched or missing headers. No cloud uploads, accounts, or subscriptions. Lifetime license with no artificial limits — your data stays fully local. Handles tens of millions of rows with a simple, user-friendly interface. Just download, unzip, and run. Free 3-day trial included — no card required.

Hey Product Hunt 👋 I built this tool because I had to compare two massive CSV dumps with millions of rows of user data a while back. I couldn’t find a suitable UI tool. Excel would crash, and cloud tools were out of the question because the data was sensitive. So I resorted to CLI commands — slow and error-prone. Took me hours to ensure the data was correct. This tool is optimized for large CSV files, but works great with smaller ones too. Benchmark (on my MacBook M2): two 50M-row CSVs compare in ~30 seconds; on Windows, ~40 seconds. Two 1M-row CSVs take about a second. It runs entirely locally, so your data never leaves your computer. I’d love your feedback — especially on performance, features, or edge cases. Did I mention there's a 3-day free trial included? Thanks for checking it out! 🙏

Lake3Tools CSV Compare desktop app - Compare CSV files with 10s of millions of rows in seconds.

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