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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•10mo 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!

Show HN: OpenAI's Cap Table – From Nonprofit to $852B in 9 Rounds

https://captable-mess.vercel.app
1•not-chatgpt•2m ago•0 comments

Show HN: Travel Hacking Toolkit – Points search and trip planning with AI

https://github.com/borski/travel-hacking-toolkit
3•borski•3m ago•0 comments

IAMF: Immersive Audio for a New Decade (2025)

http://aomedia.org/blog%20posts/IAMF-Immersive-Audio-for-a-New-Decade/
1•breve•16m ago•0 comments

Reasoning models encode tool choices before they start reasoning

https://arxiv.org/abs/2604.01202
2•diwank•19m ago•0 comments

ClawTrak – free tool to check if your AI product is invisible to AI agents

https://clawtrak.com/
1•pixelfamiliar•22m ago•0 comments

Day Counter

https://xkcd.com/3228/
1•mitchbob•22m ago•0 comments

Meta lays off hundreds as tech giant pushes forward with AI investment

https://nypost.com/2026/04/03/business/meta-lays-off-hundreds-after-ceo-mark-zuckerberg-said-ai-c...
3•1vuio0pswjnm7•31m ago•0 comments

As Slow as Possible

https://pippinbarr.com/as-slow-as-possible/
2•brianzelip•32m ago•0 comments

Pre-1900 LLM tries to solve Relativity

https://twitter.com/hla_michael/status/2039768483018489994
2•coppertrack•35m ago•0 comments

Reliable Vibe Coding Process – Automation Without Intention Is Just Faster Chaos

https://markhuang.ai/blog/automation-without-intention-is-just-faster-chaos
2•zh_code•38m ago•0 comments

Odiusfly Studio (Indie Development)

https://odiusfly.com/
2•red369•39m ago•0 comments

What do you use as preview environment?

1•Escafati•40m ago•0 comments

Ask HN: What's the most repetitive thing you do with AI that you wish it just re

1•chloecv•45m ago•1 comments

Scaling tool orchestration data will emerge different intelligence and LLMs

2•arkariarn•48m ago•0 comments

Show HN: Cj – jc rewritten in Rust, 230 parsers, 10x faster

https://github.com/zhongweili/cj
2•zhongwei2049•49m ago•0 comments

Ask HN: Analysis of credit card receipts to show one does not buy alcohol

1•bryanrasmussen•49m ago•0 comments

Delve Removed from Y Combinator

https://www.ycombinator.com/companies/delve
3•carabiner•53m ago•2 comments

50 years of Apple with the only original employee still there

https://appleinsider.com/articles/26/04/02/inside-50-years-of-apple-with-the-only-original-employ...
1•canucker2016•57m ago•0 comments

Heisuke Hironaka, Groundbreaking Mathematician andFields Medalist, Is Dead at 94

https://www.nytimes.com/2026/03/25/science/heisuke-hironaka-dead.html
2•bookofjoe•58m ago•3 comments

Apple's Fitness Chief, Who Was Accused of Harassment, Is Retiring

https://www.nytimes.com/2026/04/01/technology/apples-fitness-chief-who-was-accused-of-harassment-...
2•canucker2016•1h ago•1 comments

Artemis II Orbit Simulator

http://orbitsimulator.com/gravitySimulatorCloud/simulations/1775087816554_artemis_ii_p.html
3•mxfh•1h ago•0 comments

The Case for Economic Growth as the Path to Human Wellbeing

https://lantpritchett.org/the-case-for-sustained-rapid-inclusive-enough-economic-growth-as-a-focu...
2•barry-cotter•1h ago•0 comments

New Advances Bring the Era of Quantum Computers Closer

https://www.quantamagazine.org/new-advances-bring-the-era-of-quantum-computers-closer-than-ever-2...
1•gmays•1h ago•0 comments

NHS staff resist using Palantir software

https://www.theregister.com/2026/04/03/nhs_staff_against_palantir/
5•abdelhousni•1h ago•0 comments

Extracting System Prompt and Model Identity from Telegram's AI. It's Qwen 3.5

https://medium.com/@metraoklam/extracting-system-prompt-model-identity-from-telegrams-ai-feature-...
2•armalko•1h ago•0 comments

The story that rocked the world: Ten years of the Panama Papers, part 1 – ICIJ

https://www.icij.org/investigations/panama-papers/the-story-that-rocked-the-world-ten-years-of-th...
2•abdelhousni•1h ago•0 comments

Trump wants to slash $707M from CISA's budget

https://www.theregister.com/2026/04/03/trump_cisa_budget/
13•abdelhousni•1h ago•1 comments

UN chief tells Trump 'war is not a game show' after US bombs civilian targets

https://www.independent.co.uk/news/uk/politics/iran-war-trump-un-us-civilians-b2951408.html
14•hkhn•1h ago•1 comments

Thomistic prompt chain jailbreaks Gemini self-recognition-12 steps, no code

https://www.youtube.com/watch?v=IeGkdDygfe4
3•jcamlin•1h ago•0 comments

Void: Video Object and Interaction Deletion

https://arxiv.org/abs/2604.02296
1•jonbaer•1h ago•0 comments