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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!

Show HN: ColliePWA, a self-hosted mobile terminal for coding agents, with alerts

https://colliepwa.dev/
1•asar•50s ago•0 comments

Dr. Lael Edwards-Costa's Interactive Billiards Demo

https://lael.dev/billiards
1•vismit2000•1m ago•0 comments

The Bishop Ring Habitat

https://en.wikipedia.org/wiki/Bishop_ring_(habitat)
1•dtj1123•2m ago•0 comments

Show HN: Presence.el Online status and simple messaging for Emacs

https://git.andros.dev/andros/presence.el
1•andros•4m ago•0 comments

Show HN: Airmash – HTML5 Multiplayer Missile Warfare

https://airma.sh/
1•fivesigma•5m ago•0 comments

Ledger – walk-forward validation toolkit for retail trading strategies

https://walkfowardvalidationtoolkit.netlify.app/
1•kyoto_fixes•6m ago•0 comments

The best piece of art ever made? Enzo Mari's Autoprogettazione

https://medium.com/@hannahparadisdesign/the-best-piece-of-art-ever-made-enzo-maris-autoprogettazi...
1•Kaibeezy•6m ago•0 comments

A window switcher that does nothing until you press Option

https://alexvestea.com/
1•avestea•6m ago•0 comments

Build an Accessible Book Reader: A Raspberry Pi Scanner That Reads Printed Books

https://www.instructables.com/Build-an-Accessible-Book-Reader-a-Raspberry-Pi-Sca/
1•rbanffy•7m ago•0 comments

Claude Found Seed-indpendent collisions in most popular hash functions

https://thomasahle.com/blog/adversarial-examples-for-hashes/
1•thomasahle•9m ago•0 comments

Amtrak: A New Era of Rail Travel Has Arrived [video]

https://www.youtube.com/watch?v=J9Zj_0U1Agg
1•bennett_dev•11m ago•0 comments

The People–OK, the Men–Who Still Love Bitcoin

https://slate.com/business/2026/09/bitcoin-cryptocurrency-masculinity-economy-emotional-tether.html
2•pseudolus•15m ago•1 comments

Why Nothing Looks Cool Anymore [video]

https://www.youtube.com/watch?v=HgjXjPP_p3s
1•Kaibeezy•19m ago•0 comments

AAA AI – Autonomous AI agent squads for local and cloud LLMs

https://aaaai.me/
1•pokidovkirill•19m ago•0 comments

King Ludd

https://www.astralcodexten.com/p/king-ludd
1•andromaton•20m ago•0 comments

Self-generated prompt injections in compaction summaries

https://simonwillison.net/2026/Sep/17/compaction-summaries/
1•hn9zmdcaou•23m ago•0 comments

Show HN: A poetry site for developers – solve a code puzzle to post

https://developerpoetry.com/
1•attels33•24m ago•0 comments

OpenSaga: Matching decompilation of the Lego Star Wars

https://opensaga.dev/
2•epestr•25m ago•0 comments

Windows turned months of inactivity into a 7-hour update hostage situation

https://www.theregister.com/os-platforms/2026/09/20/how-windows-turned-months-of-inactivity-into-...
1•beardyw•26m ago•0 comments

Turn off Apple Intelligence in macOS 27

https://discussions.apple.com/docs/DOC-250012366
2•petecooper•28m ago•1 comments

Ground Effect Vehicle

https://en.wikipedia.org/wiki/Ground-effect_vehicle
2•kekqqq•29m ago•0 comments

Security Review Scope for Daml: Coverage, Methods, and EVM Comparison

https://hacken.io/discover/daml-vs-solidity-smart-contract-audits-3-scope-decisions-for-researchers/
1•Dron_Rick•35m ago•0 comments

Auto approve pull requests with Jev

https://github.com/metalbear-co/jev-auto-approve
2•infiniteregrets•41m ago•0 comments

How ISIL is using Big Tech's AI to build bombs

https://www.aljazeera.com/news/2026/9/18/just-ask-grok-how-isil-is-using-big-techs-ai-to-build-bombs
1•smallerize•41m ago•0 comments

Migrating the GitHub Copilot Runtime to Rust, Using Copilot

https://github.blog/ai-and-ml/generative-ai/migrating-the-github-copilot-runtime-to-rust-using-co...
2•saikatsg•43m ago•0 comments

RoboHarm: Do Frontier Robot Policies Refuse Unsafe Instructions?

https://robocurve.org/roboharm/
1•fittingopposite•43m ago•0 comments

Chat-based Large Language Models replicate the mechanisms of a psychic's con

https://softwarecrisis.dev/letters/llmentalist/
4•jalev•44m ago•0 comments

An Ode to the Owl: The Inside Story of Psygnosis

https://www.timeextension.com/features/an-ode-to-the-owl-the-inside-story-of-psygnosis
3•Bluestein•45m ago•0 comments

The Millennium Problems for Biology

https://millenniumproblems.bio/
7•artninja1988•47m ago•2 comments

Outer Billiards on the Penrose Kite: Compactification and Renormalizaiton

https://arxiv.org/abs/1102.4635
1•vismit2000•49m ago•0 comments