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Show HN: Indigene – Native plants for where you stand

https://indigene.app/
28•olivierlacan•2d ago•5 comments

Show HN: Theorem – Offline PDF/ePub reader that writes highlights to Local Vault

https://theorem.fundaments.work/
3•sapienskid•33m ago•0 comments

Show HN: Flipflop, Iroh-powered persistent tunnels for filesharing

https://github.com/andunieee/flipflop
43•andunie•6h ago•14 comments

Show HN: Petal, open-source CoScreen/ScreenHero finally free

https://petal.live/
173•thedracle•16h ago•39 comments

Show HN: Ito – Build Terminal UIs in Lua

https://uji.sh/ito/
23•cat-whisperer•12h ago•8 comments

Show HN: I wrote an email app that accepts only one sender per inbox

https://clova.email/
102•edpin2000•17h ago•83 comments

Show HN: My Terminal Themes Web App

20•bado•8h ago•6 comments

Show HN: A guided 3D Leonardo da Vinci museum, built in code

https://museumofages.org/w/vinci
87•micstradev•1d ago•38 comments

Show HN: Ask a technical question, get an animated explainer you can interrupt

https://openlume.com/examples/3f65f6ce-87bf-4c81-a34b-3a1ec82f0ed1
12•shadaba•11h ago•2 comments

Show HN: Graphicle, a Rust port of Graphify with memory for coding agents

https://github.com/graphicle-ai/graphicle
45•KarLexAI•19h ago•12 comments

Show HN: Guitoro, a virtual guitar you strum with your keyboard

https://guitoro.com/
560•talccc•1d ago•160 comments

Show HN: Pulse Local, a Mac budgeting app whose AI models run on your machine

https://pulseos.finance
117•niztk•1d ago•71 comments

Show HN: Hardwired - turn JS into a neural net

https://chenglou.me/handwired/
3•dvrp•6h ago•0 comments

Show HN: Timur's Chess – A 14th century chess variant with giraffes

https://timurschess.com
23•LarsDu88•3d ago•6 comments

Show HN: Use your OpenAI subscription to create audiobooks

https://pdftomp3.com/connect-ai/
171•janpmz•2d ago•90 comments

Show HN: XY Music Notation

https://music.xy.dev/
82•jmole•1d ago•77 comments

Show HN: Spotatui, a Spotify TUI/GUI without web API rate limits

https://github.com/LargeModGames/spotatui
88•LargeModGames•1d ago•18 comments

Show HN: Parsimony – an open-source benchmark for how much code AI models add

https://parsimony.lasu.dev/
77•lasu•1d ago•17 comments

Show HN: How random are you?

https://lab.specr.net/rigged-draw/
211•vunderba•1d ago•119 comments

Show HN: TowerPanic – a family party game on a small FastAPI realtime engine

https://towerpanic.com/
3•ms209495•8h ago•3 comments

Show HN: Give (low vRAM) local sLLMs codebase-wide context with SQLite (attempt)

https://github.com/govindgcoder/arcKode
3•iamgovindg•8h ago•0 comments

Show HN: I'll Call You Later, an interactive 3D browser short film

https://film.jashtechno.com
4•Jashwanth_13•8h ago•1 comments

Show HN: I built a tool to track what AI leaders say and how their views change

https://blumify.io/people
117•gcsydney•1d ago•77 comments

Show HN: SolidCraft – Open-Source Parametric CAD in Rust (With MCP Support)

https://github.com/bherbruck/solidcraft
141•bherbruck•2d ago•51 comments

Show HN: GitVolt, open source fast Git GUI (Tauri/CEF)

https://gitvolt.com/
4•francislavoie•10h ago•0 comments

Show HN: I think Apple should have built this a long time ago

https://copytap.netlify.app/
2•zacattackjuice•10h ago•3 comments

Show HN: Dub Anything – Dub videos in each actor's own voice

https://github.com/swax/dub-anything
6•swax•14h ago•3 comments

Show HN: Atticus – Hold-to-talk voice assistant for macOS that runs on Claude -p

https://github.com/SaarthurR/atticus-mac
115•SaarthRanka•3d ago•30 comments

Show HN: T0: We trained a 256M SOTA open-weights time-series forecasting model

https://github.com/theforecastingcompany/tfc-t0
14•LTMeyer•19h ago•0 comments

Show HN: Jevcrawl – A web crawler for AI agents with no LLM in the crawl loop

https://github.com/RayenMlayeh/jevcrawl
21•rayenmlayeh•1d ago•3 comments
Open in hackernews

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

https://github.com/moustafa-nasr/fahmatrix
46•mousomashakel•1y 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•1y 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•1y 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•1y 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•1y 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•1y ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•1y ago
Does Polars have a Java library?
mousomashakel•1y 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.
skanga•1y ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•1y 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•1y ago
Nice!

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

mousomashakel•1y 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.
theanonymousone
•
1y 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•1y 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.