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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!

Laya vs Jev head-to-head on identical inputs

https://github.com/instax-dutta/sysone-bench
1•beckford•1m ago•0 comments

Lean Verified Transformers

https://srush.github.io/lean-transformer/
2•matt_d•3m ago•0 comments

Lula Footage Dataset

https://huggingface.co/datasets/geoffchan/lula-footage/viewer/default/train
1•rodrigueslotu•3m ago•0 comments

Your city council can approve ALPR cameras without you ever finding out.

https://alprradar.com/
1•Humorist2290•6m ago•0 comments

Alpaca Festival – Algorithmic Patterns in the Creative Arts

https://alpaca.cc/
1•pigeons•7m ago•0 comments

I Built an AI Dating Assistant Because Swiping Is Statistically Inefficient

https://medium.com/@mgcblee/i-built-an-ai-dating-assistant-because-swiping-is-statistically-ineff...
1•am_lee•8m ago•0 comments

LibreOffice dev explains why it cannot display some Microsoft Office charts

https://www.neowin.net/news/libreoffice-developer-explains-why-it-cannot-display-some-microsoft-o...
2•bundie•19m ago•0 comments

Infinite Mac: Snow and a/UX

https://blog.persistent.info/2026/09/infinite-mac-snow-and-aux.html
2•zdw•22m ago•0 comments

Pronouncing Things with Amazon's Polly (2018)

https://cuttlesoft.com/blog/2018/09/13/pronouncing-things-with-amazons-polly/
1•gnyeki•24m ago•0 comments

Mac Screen Recorder – 30 bucks. no subscription

https://toads.io
1•jimmyshoez•31m ago•1 comments

ArtifactBench: Evaluating AI Music Detectors Under Distribution Shift

https://arxiv.org/abs/2609.23550
1•unohee•33m ago•0 comments

I_am_done_with_this_shit

https://www.reddit.com/r/ClaudeAI/comments/1wm5c21/i_am_done_with_this_shit/
2•dkga•36m ago•1 comments

Cunningham's Law

https://meta.wikimedia.org/wiki/Cunningham%27s_Law
1•vismit2000•42m ago•1 comments

Smart Software

https://twitter.com/JAS0Nduncan/status/2101759688769454422
1•pdlabs•42m ago•0 comments

Edit HTML Directly in the Browser

https://github.com/kenxle/live-agentic-html-editor
2•kenxle•42m ago•0 comments

The Rise of A.I. Is Raising Threats from Drones, Police Group Warns

https://www.nytimes.com/2026/09/19/nyregion/artificial-intelligence-drones-police.html
2•lxm•45m ago•1 comments

Show HN: ghfs – A read-only FUSE filesystem that keeps GitHub issues on disk

https://ghfs.dev/
2•ghfs_dev•47m ago•0 comments

What California Is Learning from Solar Panels Built over Irrigation Canals

https://www.kqed.org/science/2002033/heres-what-california-is-learning-from-solar-panels-built-ov...
2•Jtsummers•48m ago•0 comments

The "Windows XP Box" (2003)

https://www.mini-itx.com/projects/windowsxpbox/
1•doubletwoyou•49m ago•0 comments

Why Apple Succeeded in Japan [video]

https://www.youtube.com/watch?v=vkJU1nmI55I
1•mgh2•50m ago•0 comments

The Home Depot

https://www.acquired.fm/episodes/home-depot
2•vismit2000•52m ago•1 comments

Amazon blocks Meta's Muse AI assistant

https://www.geekwire.com/2026/amazon-blocks-metas-muse-ai-assistant-in-new-standoff-over-agentic-...
1•colinprince•55m ago•0 comments

China's AI Realism Is Not Conspiracy

https://www.fredgao.com/p/chinas-ai-realism-is-not-conspiracy
1•xpin•57m ago•0 comments

How we use dopamine to get you to spend less time on your phone

https://getisland.app/blog/fire-with-fire/
2•Intragalactic•1h ago•0 comments

New CA laws let community colleges offer up to 12 bachelor's degrees

https://calmatters.org/education/higher-education/2026/09/new-california-laws-community-college-d...
1•lxm•1h ago•0 comments

Francis Fukuyama: Why I Changed My Mind About AI Risk

https://www.persuasion.community/p/why-i-changed-my-mind-about-ai-risk
2•mellosouls•1h ago•0 comments

Smart Ring Maker Oura, Backers Seek $2.2B in US IPO

https://www.bloomberg.com/news/articles/2026-09-21/smart-ring-maker-oura-backers-seek-2-2-billion...
9•elo2000•1h ago•1 comments

OpenAI president and MAGA Inc. donor to attend Trump-Xi state dinner

https://www.politico.com/news/2026/09/21/openai-maga-donor-trump-xi-dinner-01086456
1•Alien1Being•1h ago•1 comments

Put Tabs Away

https://chromewebstore.google.com/detail/leotabs-—-tab-manager-swi/heolckkdeandgagkiefggcneodni...
2•ringlochid•1h ago•0 comments

Ottawa to build sovereign AI ecosystem for Canadian defence operations

https://www.theglobeandmail.com/business/economy/article-ottawa-building-sovereign-ai-ecosystem-f...
1•Teever•1h ago•0 comments