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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!

ClassRoot: Class Management Built by a Studio Owner

https://classroot.app
1•payanai•1m ago•0 comments

DuckDB-WASM startup: from 6.8 to 2.3 seconds with Haybarn-WASM

https://query.farm/blog/duckdb-wasm-startup-time/
1•rustyconover•1m ago•0 comments

One Hash Bloom Filters

https://www.calabro.io/ohbf
1•fanf2•1m ago•0 comments

Dynamic MCP Server Discovery on Google Cloud

https://leoy.blog/posts/dynamic-mcp-server-discovery/
1•minherz•1m ago•0 comments

The Tell: Tom Goldstein's Double Life

https://www.thfndry.com/the-tell/
1•Tomte•1m ago•0 comments

Build a Basic AI Agent from Scratch: Session Management

https://www.ruxu.dev/articles/ai/build-an-ai-agent-sessions/
1•ruxudev•2m ago•0 comments

Show HN: Stillplay – The Windows XP games, rebuilt in C and WASM for the browser

https://github.com/btahir/stillplay
1•bilater•3m ago•0 comments

Refactoring Factorials

https://www.johndcook.com/blog/2026/10/19/refactoring-factorials/
1•ibobev•6m ago•0 comments

My Problem with Omarchy Is What I Like About Arch

https://dayvster.com/blog/my-problem-with-omarchy-is-what-i-like-about-arch/
2•ibobev•6m ago•0 comments

Thing About Side Projects Is Being Allowed to Care Too Much

https://dayvster.com/blog/the-best-thing-about-side-projects-is-being-allowed-to-care-too-much/
1•ibobev•6m ago•0 comments

Open source license compliance generally available

https://github.blog/changelog/2026-10-16-open-source-license-compliance-generally-available/
1•Tomte•8m ago•0 comments

Find My throws away the route. So I built the thing that keeps it

https://gregakespret.substack.com/p/find-my-throws-away-the-route-so
1•DeGi•9m ago•1 comments

Show HN: Remakecraft – Claude Code plugin that rewrites apps from behaviour

https://github.com/remakecraft/remakecraft
1•hellosverre•10m ago•0 comments

Show HN: Vlmhub – Simple Unified Python interface for vision-language models

https://github.com/dbiswas55/vlmhub
1•db55•10m ago•0 comments

Europe EV sales rose 70.3% in September, 32.6% of market share

https://www.reuters.com/business/europe-ev-sales-rose-70-september-almost-30-market-share-2026-10...
22•giuliomagnifico•12m ago•0 comments

The EU energy battle rages on – and Italy is losing

https://europe.repubblica.it/en/news/2026/10/19/news/italy_eu_energy_battle_meloni_carbon_pricing...
2•simonebrunozzi•13m ago•0 comments

Top cases on the US Supreme Court's docket

https://www.reuters.com/world/us/top-cases-us-supreme-courts-docket-2026-10-19/
1•usernomdeguerre•15m ago•1 comments

Inception "Mercury 3", 1000 tok/s diffusion LLM

https://www.inceptionlabs.ai/blog/introducing-mercury-3
23•cmrdporcupine•16m ago•4 comments

Ukraine carries out first ever aerial drone evacuation of a wounded soldier

https://www.dailymail.com/news/article-16220441/Ukraine-carries-aerial-drone-evacuation-wounded-s...
3•theflyingelvis•16m ago•0 comments

Show HN: Senseplane open-source eyes and ears for AI agents, on your own cameras

https://github.com/senseplane-ai/senseplane
1•oludareodedoyin•18m ago•0 comments

Securing the Agentic Insider

https://blogs.microsoft.com/blog/2026/10/19/securing-the-agentic-insider/
1•AnhTho_FR•19m ago•0 comments

Prism – a fast, open-source IDM alternative for Windows and Linux

https://github.com/FortoGraphy/prism-download-manager
1•FortoGraphy•21m ago•0 comments

Tests don't prove anything, but they are a model

https://blog.drgriffin.au/posts/tests-are-a-model
1•discodave•22m ago•1 comments

Ask HN: Cheaper ways to estimate age and gender from selfies?

2•mimexi4851•22m ago•0 comments

MongoDB API compatible DocumentDB announces 1.0

https://documentdb.io/blogs/posts/documentdb-1-0/
4•xgerman•23m ago•0 comments

A Little League coach pulled aside an opposing player [Meta Glasses]

https://www.nytimes.com/athletic/7693356/2026/10/16/little-league-coach-viral-leadership-2/
2•compiler-guy•24m ago•0 comments

And Soon It Will Be Forgotten

https://desmolysium.substack.com/p/and-soon-it-will-be-forgotten
1•paulpauper•25m ago•0 comments

The Death of the Comeback

https://morbidcuriosity.substack.com/p/the-death-of-the-comeback
1•paulpauper•26m ago•0 comments

The big lie we tell ourselves as we get older

https://coached.com/essays/the-big-lie-we-tell-ourselves-as-we-get-older/
1•rohanm93•26m ago•1 comments

Lilly code editor outperforms Neovim using custom treesitter equivalent

https://tauraamui.site/blog/lilly-perf-vs-neovim-and-others
1•bloostar•27m ago•0 comments