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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!

Musk – Official Trailer – Bleecker Street [video]

https://www.youtube.com/watch?v=eY_8SyndC10
1•vintagedave•58s ago•0 comments

Steppy Fox Browser Game

https://steppyfox.com/
1•fadilbeg•2m ago•0 comments

Legal AI Harvey's margins went from +50% to -50% in 6 months on frontier costs

https://finance.yahoo.com/technology/ai/articles/openai-anthropic-costs-push-more-160523322.html
1•joennlae•3m ago•1 comments

Show HN: IGViewer – Browse public Instagram profiles and stories anonymously

https://www.igrecent.com
1•sx2026•3m ago•0 comments

Real-Time AI Simplification (A2, B1, B2) of BBC World News Live

https://voicefrom.ai/restate/
1•BrandiATMuhkuh•4m ago•0 comments

My First Language Front End with MLIR

https://whereisalan.dev/blog/kaleidoscope-mlir-tutorial/
1•alankarmisra•4m ago•0 comments

Dutch governments builds alternative for Microsoft based on NixOS

https://www.dawo.community/en/
1•fjfaase•4m ago•0 comments

You Cry [video]

https://www.youtube.com/watch?v=rLvUztp7Iog
1•mrroryflint•8m ago•0 comments

Your Language Model Is Already a Decision Model

https://github.com/ntlm1686/Your-language-model-is-already-a-decision-model/tree/master
1•ntlm1686•9m ago•0 comments

Dating a takeoff photo to the second using runway markings as a ruler

https://blog.spuria.app/writeups/angle-of-ascent-billund-klm-takeoff/
1•lost_•16m ago•0 comments

Show HN: Can an AI agent bypass a post-quantum signed authorization policy?

https://github.com/max-russo-com/MAX_AUTHORIZATION_SANDBOX
1•max-russo•16m ago•0 comments

Coming to terms with the end of the Falcon 9

https://www.thespacereview.com/article/5319/1
1•ssernikk•18m ago•0 comments

OpenAI prepares new $500/month Pro Max plan for ChatGPT

https://www.testingcatalog.com/openai-prepares-new-500-month-pro-max-plan-for-chatgpt/
3•yzydserd•20m ago•0 comments

Show HN: Foveon Lab – Compare Sigma Photo Pro Presets on Foveon X3F Files

https://github.com/biopoetic/foveon-lab
1•netless•23m ago•0 comments

Ask HN: Migrating personal email domain from Gmail to iCloud?

1•osener•24m ago•0 comments

Deep Fission ($FISN): A Money Pit

https://iceberg-research.com/2026/09/24/deep-fission-fisn-a-money-pit/
1•ViewTrick1002•25m ago•0 comments

Show HN: Tasket++ Simulate your Windows actions automatically-free and OS

https://apps.microsoft.com/detail/xp9cjlhwvxs49p?hl=en-US&gl=US
1•AmirHammoutene•25m ago•0 comments

Tesla 'FSD' sped in 55% of Brussels 30 km/h zones ahead of EU vote

https://electrek.co/2026/09/24/tesla-fsd-belgium-test-speeding-30-kmh-eu-vote/
4•BaudouinVH•30m ago•0 comments

Driver Misconduct in Last-Mile Delivery

https://arxiv.org/abs/2609.29080
1•50kIters•32m ago•0 comments

Quiet-guardrails: Claude Code manual mode, minus the nagging

https://github.com/SeanMcMillan/quiet-guardrails
1•northbridgedev•36m ago•0 comments

YC rejected it, so we're open-sourcing it

https://github.com/orangewood-co/inboundr
3•tushgaurav•37m ago•3 comments

The Subtle Art of Normalising Dystopia [video]

https://www.youtube.com/watch?v=aLPrNSFLb2U
2•dvrp•38m ago•0 comments

Amiga Screens: A Primer

https://www.datagubbe.se/amscr/
4•msephton•40m ago•0 comments

Implicit Neural Representations with Periodic Activation Functions (2020)

https://arxiv.org/abs/2006.09661
2•peter_d_sherman•41m ago•1 comments

F1 Start Timer

https://f1-start.jakearchibald.com/
1•tosh•41m ago•0 comments

Pentium II at 600Mhz with Voodoo 3 Emulated on 86Box with M6 Mac Mini

https://nyaa.sh/reviews/mac-mini-m6-emulation
2•hugh4life•44m ago•0 comments

Show HN: Entail – what your model files declare vs. what the engine runs

https://github.com/wwoosshh/Entail
1•wwoosshh•45m ago•0 comments

Pico_exporter: System metrics exporter that runs in about 120 kiB of memory

https://github.com/dpaneda/pico_exporter
1•elenathor•45m ago•1 comments

Show HN: TiddlyInstall – A single HTML file that makes cross-platform installers

https://robertsdotpm.github.io/_static/tiddlyinstall.html
1•Uptrenda•46m ago•0 comments

What is LLM-as-a-Judge, and How It Works?

https://infere.com/blog/what-is-llm-as-a-judge/
1•saturn5k•52m ago•0 comments