nowfound

Dev tools · May 17, 2025

FA

Fahmatrix – A Lightweight, Pandas-Like DataFrame Library for Java

Hey HN, I’ve built Fahmatrix, a minimal, fast Java library for working with tabular data — inspired by Python’s pandas, but designed for performance and simplicity on the JVM. After working extensively with Python’s data stack, I often ran into limitations related to speed, especially in larger or long-running data workflows. So I built Fahmatrix from scratch to offer similar APIs for manipulating CSVs, performing summary statistics, slicing rows/columns, and more — but all in Java. Features: Lightweight and dependency-free CSV/TSV import with auto-headers Series/DataFrame…

Visit github.com ↗Alternatives

In plain words

Fahmatrix is a Java library for working with tabular data that mimics Python's pandas API. It handles CSV and TSV imports, supports Series and DataFrame structures, and enables operations like summary statistics, row and column slicing, and parallel processing on numeric columns. Built as lightweight and dependency-free, it targets Java developers who need fast data manipulation in long-running workflows on the JVM without the performance limitations of Python-based alternatives.

written from the facts on this page · September 2026

From the sources

In the maker’s words, at launch

Hey HN, I’ve built Fahmatrix, a minimal, fast Java library for working with tabular data — inspired by Python’s pandas, but designed for performance and simplicity on the JVM. After working extensively with Python’s data stack, I often ran into limitations related to speed, especially in larger or long-running data workflows. So I built Fahmatrix from scratch to offer similar APIs for manipulating CSVs, performing summary statistics, slicing rows/columns, and more — but all in Java. Features: Lightweight and dependency-free CSV/TSV import with auto-headers Series/DataFrame structures (like pandas) describe(), mean(), stdDev(), percentile() and more Fast parallel operations on numeric columns Java 17+ support Docs: https://moustafa-nasr.github.io/Fahmatrix/ GitHub: https://github.com/moustafa-nasr/fahmatrix I’d love feedback from the Java and data communities — especially if you’ve ever wanted a simple dataframe utility in Java without needing full-scale ML libraries. Happy to answer any questions!

More dev tools this month

the category →
  • Dograh▲592

    The open source VAPI alternative

    Dev tools · 25d ago · dograh.com

  • Meridian▲530

    Don't let your work go unnoticed. Get promoted!

    Dev tools · 20d ago · meridiona.com

  • x1▲516

    Lovable for iPhone apps go from idea to App Store

    Dev tools · 11d ago · x1.new

  • The GTM Co-Founder▲402

    Open-source GTM skills for technical founders

    Dev tools · 29d ago · gtmcofounder.com

  • Open-Source eInk Bike Computer▲389

    OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.

    Dev tools · 1d ago · opentrailpaper.com

  • Nuphos▲380

    The AI-Native DevOps Workspace.

    Dev tools · 24d ago · nuphos.ai

Launched alongside, May 2025

the whole month →