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Show HN: macOS menu bar app to track Claude usage in real time

https://github.com/richhickson/claudecodeusage
66•RichHickson•5h ago•29 comments

Show HN: A geofence-based social network app 6 years in development

https://www.localvideoapp.com
25•Adrian-ChatLocl•3h ago•9 comments

Show HN: DeepDream for Video with Temporal Consistency

https://github.com/jeremicna/deepdream-video-pytorch
60•fruitbarrel•10h ago•23 comments

Show HN: I built a tool to create AI agents that live in iMessage

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20•danielsdk•4d ago•10 comments

Show HN: We built a permissions layer for Notion

https://notionportals.com/
9•PEGHIN•4h ago•4 comments

Show HN: Remotedays – Cross-border remote work compliance for EU companies

2•alwinaugustin•3h ago•0 comments

Show HN: I visualized the entire history of Citi Bike in the browser

https://bikemap.nyc/
109•freemanjiang•1d ago•31 comments

Show HN: Watch LLMs play 21,000 hands of Poker

https://pokerbench.adfontes.io/run/Large_Models
21•jazarwil•10h ago•16 comments

Show HN: Turn your PRs into marketing updates

https://personabox.app
2•mpc75•4h ago•0 comments

Show HN: I built a "Do not disturb" Device for my home office

https://apoorv.page/blogs/over-engineered-dnd
93•quacky_batak•5d ago•46 comments

Show HN: Pydantic-AI-stream – Structured event streaming for pydantic-AI agents

https://github.com/opale-ai/pydantic-ai-stream
5•sbargaoui•6h ago•3 comments

Show HN: Catnip – Run Claude Code from Your iPhone Using GitHub Codespaces

https://github.com/wandb/catnip
7•vanpelt•6h ago•6 comments

Show HN: Open database of link metadata for large-scale analysis

https://github.com/rumca-js/RSS-Link-Database-2025
12•renegat0x0•5d ago•1 comments

Show HN: TierHive – Hourly-billed NAT VPS with private /24 subnets

https://tierhive.com/
3•backtogeek•6h ago•0 comments

Show HN: SMTP Tunnel – A SOCKS5 proxy disguised as email traffic to bypass DPI

https://github.com/x011/smtp-tunnel-proxy
135•lobito25•1d ago•44 comments

Show HN: How I generate animated pixel art with AI and Python

https://sarthakmishra.com/blog/building-animated-sprite-hero
15•sarthak_drool•19h ago•2 comments

Show HN: Free and local browser tool for designing gear models for 3D printing

https://gears.dmtrkovalenko.dev
52•neogoose•1d ago•13 comments

Show HN: 90% of GPU Cycles Are Waste. A New Computing Primitive for Physics AI

https://github.com/isaac-sim/IsaacSim/discussions/394
2•ZuoCen_Liu•8h ago•1 comments

Show HN: I built a "Conversion Killer Detector" to audit landing page copy

https://vect.pro/#/signup?continue=%2Fapp%2Ftools%3Ftool%3DConversion+Killer+Detector
2•afrazullal•9h ago•1 comments

Show HN: Tailsnitch – A security auditor for Tailscale

https://github.com/Adversis/tailsnitch
276•thesubtlety•3d ago•28 comments

Show HN: Mantic.sh – A structural code search engine for AI agents

https://github.com/marcoaapfortes/Mantic.sh
77•marcoaapfortes•2d ago•37 comments

Show HN: VaultSandbox – Test your real MailGun/SES/etc. integration

https://vaultsandbox.com/
56•vaultsandbox•2d ago•11 comments

Show HN: KeelTest – AI-driven VS Code unit test generator with bug discovery

https://keelcode.dev/keeltest
28•bulba4aur•1d ago•15 comments

Show HN: DoNotNotify – Log and intelligently block notifications on Android

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343•awaaz•3d ago•165 comments

Show HN: ADHD Focus Light

https://github.com/zonghaoyuan/adhd-focus-light
16•zonghao•18h ago•1 comments

Show HN: 48-digit prime numbers every git commit

https://textonly.github.io/git-prime/
66•keepamovin•1w ago•54 comments

Show HN: Prism.Tools – Free and privacy-focused developer utilities

https://blgardner.github.io/prism.tools/
370•BLGardner•2d ago•101 comments

Show HN: Comet MCP – Give Claude Code a browser that can click

https://github.com/hanzili/comet-mcp
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Show HN: Stash – Sync Markdown Files with Apple Notes via CLI

https://github.com/shakedlokits/stash
72•shuka•2d ago•21 comments

Show HN: A game/benchmark where AI bots hunt each other

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3•-babi-•12h 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•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.