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Show HN: PasteClean – Desktop app to strip tracking parameters from clipboard

https://iixotic.github.io/PasteClean/website/
15•Iblockedthem•1h ago•4 comments

Show HN: A pager

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84•keepamovin•1d ago•33 comments

Show HN: I made Claude Code learn from its mistakes

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Show HN: Cordon – Reduce large log files to anomalous sections

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Show HN: Abstract Algorithmic Art Generator

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Show HN: I made a Minecraft torch out of a vape I found on the ground

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Show HN: A visual reminder for ADHD brains

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Show HN: I Ching simulator with accurate Yarrow Stalk probabilities

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Show HN: Go Libraries for Working with OpenAPI

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Show HN: 100 Million splats, a whole town, rendered in M2 MacBook Air

https://twitter.com/AKurian001/status/1986979144014701026
67•Arun_Kurian•9h ago•37 comments

Show HN: Long term, data only eSIMs – built with Claude Code

https://jetogo.com
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Show HN: Open-Source Notion MCP Server (TypeScript, SSE, Apify)

https://github.com/piskunproject/notion-mcp-server
7•piskunlab•12h ago•0 comments

Show HN: I built an open-source alternative to the "brainrot IDE" that YC funded

https://github.com/CMLKevin/Touch-Grass-IDE
5•DrSparrowhawk•7h ago•0 comments

Show HN: A lightweight SaaS to reduce early-stage app friction

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Show HN: Cargo-rail: graph-aware monorepo tooling for Rust; 11 deps

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Show HN: A Wordle-style game for SHA-256 hashes

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Show HN: Kenobi – AI personalized website content for every visitor

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Show HN: ModelGuessr: Can you tell which AI you're chatting with?

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Show HN: Agent Deck – Terminal Dashboard to Manage Claude/Gemini/Codex Sessions

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Show HN: Generate Passwords from Regex Constraints

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8•ngruhn•17h ago•3 comments

Show HN: Open-source customizable AI voice dictation built on Pipecat

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Show HN: Sub-microsecond (890 ns) trading execution research system

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Show HN: PowerNetbox – PowerShell module with 100% NetBox API coverage

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Show HN: Footywhoops – A real-time audio pattern generator and a MIDI Sequencer

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Show HN: I made a spreadsheet where formulas also update backwards

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249•fouronnes3•4d ago•113 comments

Show HN: Solving Zodiac's Z32 – top candidate has anomaly visible from space

https://github.com/dstampher/zodiac-z32-cipher
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Show HN: Tiny VM sandbox in C with apps in Rust, C and Zig

https://github.com/ringtailsoftware/uvm32
194•trj•3d ago•12 comments

Show HN: KpopAPI – RESTful Kpop API:)

https://www.kpopapi.com/docs
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Show HN: 999 Penguins

https://999penguins.com
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Show HN: Tripwire: A new anti evil maid defense

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81•DoctorFreeman•4d ago•49 comments
Open in hackernews

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

https://github.com/moustafa-nasr/fahmatrix
46•mousomashakel•7mo ago
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!

Comments

rickette•7mo ago
Congrats on putting this out there. There isn't a de facto pandas-like library in Java like you said. But for Kotlin there is: https://github.com/Kotlin/dataframe
mousomashakel•7mo ago
Thanks so much! Yep, I’ve seen the Kotlin DataFrame lib — very elegant. Fahmatrix is meant for plain Java users who want similar capabilities without switching ecosystems. Appreciate the support!
uwemaurer•7mo ago
Always great to see efforts to make working with data frames easier. Here are some similar data frame libraries for Java:

https://github.com/jtablesaw/tablesaw

https://github.com/dflib/dflib

My preferred way is just use duckdb java API. I didn't see anything better in performance/efficiency. Also a SQL query is often easier to write

theanonymousone•7mo ago
Yes. It has bothered me for a long time too. Maybe the best mix is a dataframe library with basic operations (column select, non-null etc), which also allows SQL for more complex stuff?
radus•7mo ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•7mo ago
Does Polars have a Java library?
mousomashakel•7mo ago
Totally agree that SQL can be the best tool for many jobs. My goal with Fahmatrix is to serve the opposite niche: where devs want something that's Java-native, procedural, and simple without reaching for an external engine. SQL support or DSL might come later though — I see the appeal.
theanonymousone•7mo ago
Sure. So maybe notehr comment would be to make it (particularly the Series class), as compatible with Java Streams as possible.

Next step would likely be compatibility with popular libraries such as Apache Commons Math: https://commons.apache.org/proper/commons-math/userguide/sta...

mousomashakel•7mo ago
Thanks! I'm aware of those great projects. Fahmatrix aims to offer a lightweight, dependency-free alternative that’s easy to embed in any Java app. DuckDB is super impressive, especially for SQL-heavy tasks — but my goal is more about a native, fluent API for those who prefer direct Java code over SQL.
skanga•7mo ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•7mo ago
Good question. I’ll publish benchmarks soon, but the core difference is that Fahmatrix is fully Java, no JNI, and minimalistic — ideal for small projects or environments like Android. Tablesaw and Arrow are more powerful, but heavier. Fahmatrix aims to be the “just enough” middle ground.
owlstuffing•7mo ago
Nice!

I’m currently using manifold-sql with duckdb for this.

mousomashakel•7mo ago
Thanks! That’s a great combo — manifold-sql + duckdb gives you strong typing with powerful SQL under the hood. Fahmatrix is aiming to complement that approach for cases where you want quick, native Java code without SQL — e.g., when building data flows or custom logic inline. Would love to hear if you’ve hit any pain points that a Java-native approach could help with.