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Show HN: TikTok user finder and video donwloader

https://ohmytt.com/
2•valorantPanda•56m ago•0 comments

Show HN: Zero dependency cross-language background job queue server

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Show HN: I turned my iPhone and a $20 smart plug into an f-stop timer

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73•pentakkusu•13h ago•23 comments

Show HN: I made a new number puzzle

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Show HN: Parseable, an open observability datalake, handles 100M time-series/min

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82•yashdotrv•14h ago•18 comments

Show HN: An AI agent runs ten web errands a day, every transcript published

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Show HN: YAVCHN, Yet Another Vibe-Coded Hacker News (Reader)

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Show HN: TerrainSR – fast, realistic heightmap upscaling model

https://huggingface.co/joe-gibbs/terrainsr
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Show HN: Show HN: InterPoll, signed posts replicated over Gun relays/browsers

https://github.com/Interpoll1/decentralised
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Show HN: SecretGate – self-hosted anonymous inbox, E2E encrypted in the browser

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Show HN: I build a newsreader-like alternative interface for my website

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Show HN: Jotbus – a shared encrypted scratchpad for coding agents

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Show HN: Vokalu – Windows/Mac dictation, free on-device or 2¢/min in the cloud

https://vokalu.com/
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Show HN: An MCP server that finds text your agent reads and you can't see

https://hiddencontent.ai/start/
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Show HN: AI Circuit Breaker – Reverse proxy to stop agent infinite loops

https://circuit-breaker-sage.vercel.app/
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Show HN: VoxScribe, a local hold-to-talk voice dictation app for Windows

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Show HN: Entombed in a Raycaster

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Show HN: Nightwatch – a Mac menu-bar app that tells you when tonight is clear

https://github.com/rsutcliffe/nightwatch
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Show HN: DevPause – infinite worlds of living sculpture, rendered in raw WebGL2

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Show HN: Photoc – Command-line tools for photographers

https://github.com/ahmetomerv/photoc
60•ahmetomer•3d ago•11 comments

Show HN: HieraticBench – Can AI read ancient Egyptian handwriting?

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3•amoursy•8h ago•1 comments

Show HN: Self-custody USDC billing for metered APIs – no Stripe, no bank, $0/mo

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Show HN: AI search for every photo and every frame of video on macOS

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Show HN: Pixel-exact HTML-to-PDF in the browser, no Puppeteer or server

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Show HN: Kahawai – An open source, modular media system

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32•linesofcode•1d ago•9 comments

Show HN: Minigraf – An embedded, bi-temporal graph database in Rust

https://github.com/project-minigraf/minigraf
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Show HN: SPrav Job AI Client-side career tool with WebGPU and direct ATS queries

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Show HN: Nuticast – Xcode wireless debugging for an iPhone on a different Wi-Fi

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3•nutiverse•12h ago•0 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.