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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!

More companies locked out of Microsoft verification

https://twitter.com/osrdrivers/status/2042286973461709183
1•karel-3d•2m ago•0 comments

Artemis II and the invisible hazard on the way to the Moon

https://www.ansto.gov.au/news/artemis-ii-and-invisible-hazard-on-way-to-moon-part-1
1•zeristor•2m ago•0 comments

How HN: $2/Day AI – How we run an autonomous agent on a hard budget

https://www.veltrixcollective.com/research/cost-first-agent-architecture
2•LukeJMadden•4m ago•0 comments

The Download: AstroTurf wars and exponential AI growth

https://www.technologyreview.com/2026/04/09/1135514/the-download-astroturf-wars-exponential-ai-gr...
1•joozio•5m ago•0 comments

Password Manager Angst

https://www.tbray.org/ongoing/When/202x/2026/04/09/Password-Manager-Angst
1•HieronymusBosch•5m ago•0 comments

Use Claude to Annotate Handwriting and Photos on iPhone

https://github.com/bramses/Brams-Bounding-App/tree/main
1•_bramses•8m ago•0 comments

Hi. Professional C/C++ programmer here

https://twitter.com/robertgraham/status/2042039637984596459
1•tosh•9m ago•0 comments

New Pokit Meter

https://shop.pokitmeter.com/en-gb/products/pokitmeter
1•aquir•11m ago•0 comments

IPI-Scanner – Detect Indirect Prompt Injection Attacks

https://github.com/amitgupta-ag/ipi-scanner
1•xamitgupta•14m ago•0 comments

Gillis Carter Turpentining Tools and Techniques (2004) [video]

https://www.youtube.com/watch?v=b-yq-2vON1Q
1•brudgers•19m ago•0 comments

You can't trust Privacy and Security

https://eclecticlight.co/2026/04/10/why-you-cant-trust-privacy-security/
1•frizlab•20m ago•1 comments

Gen Z workers are intentionally sabotaging their company's AI rollout

https://fortune.com/2026/04/08/gen-z-workers-sabotage-ai-rollout-backlash/
3•dingi•21m ago•0 comments

AI news gave me anxiety so I built a site where every AI story says don't panic

https://readnotpanic.ai/
1•rushibam•22m ago•0 comments

Entity Component System

https://en.wikipedia.org/wiki/Entity_component_system
1•tosh•23m ago•0 comments

Hello BQN! Goodbye APL and Uiua (2024)

https://edmcman.github.io/blog/2024-12-20--hello-bqn-goodbye-apl-and-uiua/
1•turtleyacht•23m ago•0 comments

HWMonitor and CPU-Z downloads compromised [video]

https://www.youtube.com/watch?v=fqLDMyAtFYs
1•ddtaylor•24m ago•0 comments

Make Your Phone a Tool

https://danferns.github.io/notes/phone/
2•thepianodan•27m ago•1 comments

Data Oriented Design by example (2017)

https://nikitablack.github.io/post/data_oriented_design_by_example/
2•tosh•27m ago•0 comments

The structural engineer's other job

https://christophermeiklejohn.com/ai/verification/zabriskie/agents/2026/04/09/the-structural-engi...
2•azhenley•27m ago•0 comments

Are You Managing Your AI, or Is Your AI Managing You?

https://octigen.com/blog/posts/2026-04-07-whos-boss/
1•m_mueller•32m ago•0 comments

Ask HN: Best API Documentation Tools?

3•themast•41m ago•1 comments

Books vs. Screens: What Does the Latest Research Say?

https://www.govtech.com/education/k-12/books-vs-screens-what-does-the-latest-research-say
1•the-mitr•44m ago•0 comments

Watgo: WebAssembly Toolkit for Go

https://eli.thegreenplace.net/2026/watgo-a-webassembly-toolkit-for-go/
1•ingve•45m ago•0 comments

Penguin 'Toxicologists' Find PFAS Chemicals in Remote Patagonia

https://www.ucdavis.edu/health/news/penguin-toxicologists-find-pfas-chemicals-remote-patagonia
2•giuliomagnifico•51m ago•1 comments

The Limit in the Loop

https://weaviate.io/blog/limit-in-the-loop
2•eigenBasis•53m ago•0 comments

The tool that won't let AI say anything it can't cite

https://github.com/grainulation/grainulator
24•volatilityfund•57m ago•6 comments

Why Prospects Ghost You

https://usepipeline.ai/
1•ExecutiveDre•58m ago•1 comments

Seal sleeping on road causes Mornington Peninsula traffic delays

https://www.abc.net.au/news/2026-04-10/road-blocked-sleeping-seal-mornington-peninsula-police/106...
1•defrost•58m ago•0 comments

No-Stack Web Development

https://dbushell.com/2026/04/10/no-stack-web-development/
2•jannesan•1h ago•0 comments

What Did You Name Your Bot?

https://kilo.ai/kiloclaw/names
1•twapi•1h ago•0 comments