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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!

Trump fires all 24 members of the U.S. National Science Foundation

https://www.science.org/content/article/trump-fires-nsf-s-oversight-board
2•skullone•51s ago•0 comments

Show HN: A privacy first companion AI

https://www.friendai.pro
1•krunkworx•3m ago•0 comments

George Washington as entrepreneur (2021)

https://lawliberty.org/george-washington-as-entrepreneur/
2•hhs•7m ago•0 comments

Show HN: LLM-wiki – One command Karpathy's wiki with QMD search for Claude/Codex

https://github.com/ivankuznetsov/llm-wiki
2•ivankuznetsov11•11m ago•1 comments

Objects of Categories as Complex Numbers (2002)

https://arxiv.org/abs/math/0212377
2•pizza•11m ago•0 comments

How I leared what a decoupling capacitor is for, the hard way

https://nbelakovski.substack.com/p/how-i-learned-what-a-decoupling-capacitor
2•actinium226•12m ago•0 comments

Got Bugs? U of G Collecting Samples to Catalogue Canada's Biodiversity

https://news.uoguelph.ca/2026/04/got-bugs-u-of-g-collecting-samples-to-catalogue-canadas-biodiver...
2•gnabgib•15m ago•0 comments

The Self-Defeating Condescension of an Anti-Racist Education

https://www.theatlantic.com/ideas/2026/04/anti-racism-schools-achievement-gap/686912/
3•apparent•18m ago•1 comments

Bitwarden CLI Backdoored on NPM for 93 Minutes

https://hackingpassion.com/bitwarden-cli-supply-chain-attack/
2•milkglass•20m ago•1 comments

Hair Dryer Used to Manipulate Polymarket

https://www.engadget.com/big-tech/someone-allegedly-used-a-hairdryer-to-rig-polymarket-weather-be...
2•simpleintheory•20m ago•1 comments

The Eurail Breach and the Digital ID Problem

https://reclaimthenet.org/the-eurail-breach-and-the-digital-id-problem
2•Cider9986•20m ago•0 comments

Astronomy and Mathematics in the Indian Classical Age

https://zenodo.org/records/15715590
1•suyashdeep•21m ago•1 comments

opinion: Professors Are Too Old

https://www.chronicle.com/article/professors-are-too-old
1•paulpauper•21m ago•1 comments

How Short-Form Clips Took over the Internet

https://www.theatlantic.com/podcasts/2026/04/how-short-form-clips-took-over-the-internet/686922/
1•paulpauper•22m ago•1 comments

Hedd Wyn

https://en.wikipedia.org/wiki/Hedd_Wyn
1•thedrexster•23m ago•0 comments

Action Potentials for April

https://neurobiology.substack.com/p/action-potentials-for-april-ab6
1•paulpauper•23m ago•0 comments

Steve Reich reshaped the boundaries of musical time (2025)

https://kolapse.com/en/contenido/90817-how-steve-reich-reshaped-the-boundaries-of-musical-time
2•thomassmith65•27m ago•1 comments

Yam – Local AST-based plagiarism detector (MOSS alternative)

https://gitlab.com/sylvan.wood.carving-group/yam.git
2•jmresler•28m ago•0 comments

Single-binary dotfiles manager to replace dotbot

https://github.com/fisenkodv/dfm
2•fisenkodv•30m ago•0 comments

Europe–not US–first to authorize Moderna's combo mRNA flu-Covid vaccine

https://arstechnica.com/health/2026/04/europe-not-us-first-to-authorize-modernas-combo-mrna-flu-c...
4•Brajeshwar•32m ago•0 comments

Protovac Retro Terminal (2025)

https://tanner.vc/protovac-retro-terminal/
4•wonger_•38m ago•0 comments

Text-wrap:balance; CSS rule to avoid typographic orphans

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/text-wrap
2•hypertexthero•39m ago•0 comments

USB Cheat Sheet

https://fabiensanglard.net/usbcheat/index.html
3•gwerbret•49m ago•0 comments

Two Compilers, One Moment

https://intertwingly.net/blog/2026/04/25/Two-Compilers-One-Moment.html
2•ingve•52m ago•0 comments

Kevin Graaf: Computerising Hyerogliphic Scripts

https://www.youtube.com/watch?v=Vhx-hRyh6BM
1•aeontech•53m ago•0 comments

The 3D Controller That Should Have Existed 20 Years Ago [video]

https://www.youtube.com/watch?v=u1v7TXViRi8
2•smusamashah•56m ago•0 comments

The avionics suite designed to let anyone fly a plane

https://newatlas.com/aircraft/interview-airhart-aeronautics-cockpit-avionics-suite/
1•breve•57m ago•0 comments

MCP Spine – Middleware proxy for LLM tool calls with security and token control

https://github.com/Donnyb369/mcp-spine
1•Mxwell369•1h ago•0 comments

Show HN: LawVM, a compiler for replaying amendment acts into point-in-time law

https://lawvm.org/
1•ekns•1h ago•0 comments

Ask HN: How did the industry settle on weekly limits?

3•saratogacx•1h ago•1 comments