Launched this week
Lake3Tools CSV Compare desktop app

Lake3Tools CSV Compare desktop app

Compare CSV files with 10s of millions of rows in seconds.

2 followers

Visit website
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.
Lake3Tools CSV Compare desktop app gallery image
Lake3Tools CSV Compare desktop app gallery image
Lake3Tools CSV Compare desktop app gallery image
Free Options
Launch tags:Productivity•Spreadsheets•Developer Tools
Launch Team / Built With
Intercom
Intercom
Startups get 90% off Intercom + 1 year of Fin AI Agent free
Promoted

What do you think? …

Florin Dragota
Maker
📌
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! 🙏