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Show HN: Reaktiv – I built Excel-like reactive programming for Python

https://bui.app/when-frontend-reactivity-meets-backend-python-the-story-of-my-first-1-000-download-library/
2•buibuibui•11mo ago
Hi HN! I created Reaktiv, a Python library bringing reactive programming to the backend world that recently hit 1,000+ monthly downloads.

I'm actively promoting it because I believe signal-based reactivity (a concept that spread rapidly in frontend development) has huge untapped potential in Python. My breakthrough came when I stopped describing it as "Angular signals for Python" and started calling it "Excel-like computation graphs" - suddenly Python developers understood the value.

The library automatically tracks dependencies between computations, only recalculating values when dependencies change. This eliminates manual dependency tracking, prevents synchronization bugs, and reduces cognitive load when managing complex state.

Interestingly, I've noticed some initial interest from data scientists, though I'm still exploring what specific problems it might solve for them. I also believe the Home Assistant/IoT communities could benefit greatly from this approach.

Would love your thoughts on bringing frontend patterns to backend development!

DNS reconnaissance and what it reveals about domains

https://www.whoisxmlapi.com/blog/dns-reconnaissance
1•mennylevinski•32s ago•0 comments

Welcome to Google Cloud Next '26

https://cloud.google.com/blog/topics/google-cloud-next/welcome-to-google-cloud-next26
1•Nic0•1m ago•0 comments

Design is not a moat. It's a generous gift

https://metedata.substack.com/p/008-design-is-a-generous-gift
1•young_mete•2m ago•0 comments

Delta Battlefield Management System

https://en.wikipedia.org/wiki/Delta_(situational_awareness_system)
1•e12e•7m ago•1 comments

Monkey Linux (1997)

https://jenda.hrach.eu/f2/monkeylinux/english.htm
2•alfiedotwtf•10m ago•1 comments

Lufthansa cuts 20k summer flights as fuel prices surge

https://www.bbc.co.uk/news/articles/cre1r4n5j5wo
1•vinni2•11m ago•0 comments

Geoviz JavaScript Library

https://riatelab.github.io/geoviz/
3•mariuz•15m ago•0 comments

Anthropic tests how devs react to yanking Claude Code from Pro plan

https://www.theregister.com/2026/04/22/anthropic_removes_claude_code_pro/
1•marcofloriano•16m ago•1 comments

Smile v6.0 Was Released

https://github.com/haifengl/smile
1•pdsminer•17m ago•1 comments

Iliad fragment found in Roman-era mummy

https://www.thehistoryblog.com/archives/75877
1•wise_blood•17m ago•0 comments

How to Open Source and Not Starve

https://hajo.me/blog/2026/04/22/how-to-open-source-and-not-starve/
2•fxtentacle•19m ago•1 comments

The handmade beauty of Machine Age data visualizations

https://resobscura.substack.com/p/the-handmade-beauty-of-machine-age
1•benbreen•20m ago•0 comments

You lose words on the tip of your tongue (2020)

https://www.bbc.com/future/article/20201125-on-the-tip-of-your-tongue-is-it-a-sign-of-a-bad-memory
1•stephen-hill•20m ago•1 comments

Reverse-engineering a supply chain attack delivered via fake Web3 job interview

https://www.reymom.xyz/blog/security/2026-04-15-supply-chain-attack
1•reymon-dev•20m ago•1 comments

Everything I know about floppy disks (2023)

https://thejpster.org.uk/blog/blog-2023-08-28/
1•stephen-hill•21m ago•0 comments

Build It Yourself (2025)

https://lucumr.pocoo.org/2025/1/24/build-it-yourself/
1•stephen-hill•21m ago•0 comments

AI fact-checker with guardrail classifier and MCP server

https://fact-check-analyzer.vercel.app/
1•amahadeven•22m ago•1 comments

How Skopx Learns Your Business While You Work

https://skopx.com/resources/live-platform-business-context
1•skopx•23m ago•0 comments

Open Benchmark: Text Normalization in Commercial Streaming TTS Models

https://async-vocie-ai-text-to-speech-normalization-benchmark.static.hf.space/index.html
1•baghdasaryana•23m ago•0 comments

Push Notifications Can Betray Your Privacy (and What to Do About It)

https://www.eff.org/deeplinks/2026/04/how-push-notifications-can-betray-your-privacy-and-what-do-...
1•u1hcw9nx•25m ago•0 comments

Don't read the PDF, write the parser

https://adriacidre.com/blog/self-healing-parsers-instead-of-vision/
2•kumulo•26m ago•1 comments

Context Bloat in AI Agents

https://glama.ai/blog/2025-12-16-what-is-context-bloat-in-mcp
2•OmShree0709•26m ago•0 comments

Linus Torvalds on AI code review: Anybody who thinks all AI is slop is in denial

https://lore.kernel.org/intel-gfx/CAHk-=wi_drr4Ls9KtXW1k8L2FUDF0YdnyjvKmPgLXHDFnnRWEg@mail.gmail....
11•victordw•26m ago•1 comments

A record-setting 31.4 Tbps attack caps a year of DDoS assaults

https://blog.cloudflare.com/ddos-threat-report-2025-q4/
1•theorchid•26m ago•0 comments

Tim Cook to Be Replaced by Near-Identical,More Expensive CEO with a Nicer Camera

https://unsourcednews.com/tim-cook-to-be-replaced-by-near-identical-more-expensive-ceo-with-a-nic...
5•01-_-•27m ago•0 comments

Show HN: CatchAll – slowest web search API that outperforms everything on recall

https://platform.newscatcherapi.com/catchall/try
5•artembugara•27m ago•1 comments

TurboOCR: CUDA and TensorRT OCR Server at 270 img/s

https://github.com/aiptimizer/TurboOCR
1•pfdomizer•27m ago•0 comments

Show HN: Ohita – a tool to simplify API key management for AI agents

https://ohita.tech/
2•jusasiiv•27m ago•0 comments

Statutory Copyleft

https://www.thomas-huehn.com/statutory-copyleft/
1•Brajeshwar•28m ago•0 comments

Google puts AI agents at heart of its enterprise money-making push

https://www.reuters.com/business/google-puts-ai-agents-heart-its-enterprise-money-making-push-202...
1•tartoran•28m ago•0 comments