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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•1y 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!

We contain Claude across products

https://www.anthropic.com/engineering/how-we-contain-claude
1•Tomte•36s ago•0 comments

Show HN: V0.6.0-pre.14 hopefully the last release before v0.6.0

https://codeberg.org/ordinarylabs/Ordinary/releases/tag/v0.6.0-pre.14
1•seanwatters•6m ago•0 comments

Show HN: Komi-learn – continuous memory and self-improvement for coding agents

https://github.com/kurikomi-labs/komi-learn
1•rainxchzed•6m ago•0 comments

Blackwall – OSINT exposure scanner that pulls from real sources

https://theblackwall.vercel.app/
2•jwallace•13m ago•0 comments

Gradient animation using a WebGL shader

https://garden.bradwoods.io/notes/shaders/gradient
2•bradwoodsio•15m ago•0 comments

A standard for building production AI agents (+ installable Claude Code skills)

https://github.com/AlexDuchDev/agentic-product-standard
2•AlexDuch•17m ago•0 comments

OMP – pi agent with batteries included and a coding agent with the IDE wired in

https://omp.sh/
2•himata4113•19m ago•0 comments

The Last Coder: A Mockumentary

https://twitter.com/deepwhitman/status/2060938449541345294
2•bilater•23m ago•0 comments

The Two Doors

https://pilgrima.ge/p/the-two-doors
2•xenophonf•23m ago•0 comments

Update notifications for your CLI app

https://github.com/sindresorhus/update-notifier
2•ankitg12•24m ago•0 comments

The Record

https://soundbarrier.io/posts/the_record/
2•oneofthose•26m ago•0 comments

Ask HN: How you pass legacy to others?

2•jojwong•28m ago•0 comments

Ferrari Built the Luce for Outsiders. Its Own Fans Are the Only Ones Talking

https://getcarcurious.com/stories/ferrari-luce-podcast-reaction
2•mountaineer•28m ago•0 comments

Aliens.gov

https://www.whitehouse.gov/aliens/
2•sarkarghya•28m ago•4 comments

I made an free unlimited captcha alternative

2•david3289•29m ago•1 comments

Travel back to 1998 and use Lovable on Windows 98

https://www.sinalytica.com/
2•teddyX•33m ago•0 comments

Ahoy, DECmate II the little PDP-8 that could

http://oldvcr.blogspot.com/2026/05/ahoy-decmate-ii-little-pdp-8-that-could.html
8•TMWNN•35m ago•0 comments

Building a LangGraph pipeline for production data engineering

https://labyrinthanalyticsconsulting.com/blog/building-first-langgraph-pipeline
4•labyrinthAC•39m ago•0 comments

Peter Thiel's Move to Argentina Reflects Billionaire Trend

https://www.businessinsider.com/peter-thiel-argentina-billionaire-moving-abroad-2026-5
3•nreece•53m ago•1 comments

Microsoft NetMeeting was more important than you think [video]

https://www.youtube.com/watch?v=qhay6VryyvE
2•jervant•56m ago•0 comments

Just for fun, generate your websites alter ego

https://webalterego.com
2•pointscard•56m ago•1 comments

Ghostbase – describe an agent in plain English, it runs on a webhook or cron

https://ghostbase.ai/
2•florianberisha•1h ago•0 comments

Cancer jab can eradicate tumours in patients, trial shows

https://www.theguardian.com/science/2026/may/30/cancer-jab-can-eradicate-entire-tumours-in-patien...
5•Teever•1h ago•0 comments

If Windows were designed today, would the Registry exist? [video]

https://www.youtube.com/watch?v=bkrbew3Ls60
5•LelouBil•1h ago•1 comments

86Box v6.0

https://86box.net/2026/05/31/86box-v6-0.html
5•chungy•1h ago•3 comments

Open models lag closed models by 4 months

https://epoch.ai/data-insights/open-closed-eci-gap
4•intelkishan•1h ago•1 comments

Adverse childhood experiences and risk of mental disorders: A systematic review

https://www.sciencedirect.com/science/article/pii/S0001691826007559
4•rendx•1h ago•0 comments

The Digital Maieutic: Socrates and the Art of Prompting

https://forum.effectivealtruism.org/posts/qsG9LwjD9ZAERiTFc/the-digital-maieutic-socrates-and-the...
2•rramadass•1h ago•1 comments

Hydrogen and oxygen make water [video]

https://www.youtube.com/watch?v=UV8KbQyF228
3•tripdout•1h ago•0 comments

Scaling Laws Meet Model Architecture: Toward Inference-Efficient LLMs

https://arxiv.org/abs/2510.18245
2•matt_d•1h ago•0 comments