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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!

Starlink Reluctant to Operate in Taiwan

https://www.taipeitimes.com/News/taiwan/archives/2026/04/23/2003856096
1•keepamovin•1m ago•0 comments

Period tracking app has been yapping about your flow to Meta

https://femtechdesigndesk.substack.com/p/your-period-tracking-app-has-been
1•campuscodi•1m ago•0 comments

Sending stdin into a container using nothing but kernel primitives

https://blog.apario.net/sending-stdin-into-a-container
1•btdahl•1m ago•0 comments

The Countess and the Engine

https://drdavidwbell.substack.com/p/the-countess-and-the-engine
1•drdavidwbell•2m ago•0 comments

New Gas-Powered Data Centers Could Emit More Greenhouse Gases Than Whole Nations

https://www.wired.com/story/new-gas-powered-data-centers-could-emit-more-greenhouse-gases-than-en...
2•aa_is_op•3m ago•0 comments

I wrote a DOOM clone in my own programming language

https://spectrelang.org/log/devlog#cubedoom
1•pizza_man•3m ago•0 comments

AI coding works, that's the problem [video]

https://www.youtube.com/watch?v=2dTENijF30c
1•tobr•4m ago•0 comments

You may see Japanese soccer fans cleaning up the stadium after World Cup games

https://apnews.com/article/japan-clean-world-cup-be16f404d002539fc8a29c718bab4ce8
1•HieronymusBosch•5m ago•0 comments

Utah greenlights 9GW AI campus using over twice state electricity

https://www.tomshardware.com/tech-industry/kevin-o-learys-9-gw-utah-data-center-campus-approved
1•embedding-shape•7m ago•0 comments

Who owns the code Claude Code wrote?

https://legallayer.substack.com/p/who-owns-the-claude-code-wrote
3•senaevren•8m ago•0 comments

Show HN: AI Email Design – Create beautiful newsletters in multiple models

https://shuffle.dev/ai-email-design
1•kemyd•14m ago•0 comments

The Markdown Link no. 23

https://md-handbook.com/blog/markdown-link-no-23/
1•wordius•18m ago•1 comments

Paying for Azure Trusted Signing, yet installers get blocked on Windows

https://github.com/Azure/artifact-signing-action/issues/128
2•grujicd•19m ago•1 comments

I'm training combat agents so they're ready when the drones are real

https://tokenstree.eu/newsletter/2026-04-27-androidwars-agent-training.html
2•vfalbor•24m ago•0 comments

SpaceX ties Musk compensation to Mars colonization goal

https://www.reuters.com/sustainability/boards-policy-regulation/spacex-ties-musk-compensation-mar...
2•goodcanadian•24m ago•2 comments

The missing step between hype and profit

https://www.technologyreview.com/2026/04/27/1136456/the-missing-step-between-hype-and-profit/
1•joozio•24m ago•0 comments

Build a biometric data harvesting empire from scratch in FACEMINER

https://store.steampowered.com/app/2276980/FACEMINER/
1•doener•25m ago•0 comments

News Finance AI – Cutting through the noise with LLM sentiment analysis

https://newsfinanceai.com/landing-page/
1•globalbiz•26m ago•0 comments

Tell HN: Your ChatGPT account can be deactivated at any moment, losing your data

4•try-working•26m ago•0 comments

The Hormuz digital chokepoint: How does the Iran war threaten subsea cables?

https://www.reuters.com/business/media-telecom/hormuz-digital-chokepoint-how-does-iran-war-threat...
1•JumpCrisscross•27m ago•0 comments

Blippo+ is a live-action, off-cable TV simulator

https://store.steampowered.com/app/3323850/Blippo/
1•doener•27m ago•0 comments

Stanford CS336 – Language Modeling from Scratch (2025)

https://cs336.stanford.edu/spring2025/
2•Anon84•28m ago•0 comments

Simulacra: An interactive horror experience of exploring a missing woman's phone

https://store.steampowered.com/app/712730/SIMULACRA/
1•doener•29m ago•0 comments

There is no main.js

https://alexanderweichart.de/4_Projects/agent-native-software/There-is-no-main-js
2•surrTurr•29m ago•0 comments

Are prediction markets well-calibrated? Analysis of 7,661 Polymarket markets

https://polymarket-calibration.vercel.app
2•johnleslie_pm•29m ago•0 comments

True Anomaly raises $650M, reaching $2.2B valuation

https://spacenews.com/true-anomaly-raises-650-million-reaching-2-2-billion-valuation/
1•defrost•30m ago•1 comments

The players who lost big money on Peter Molyneux's failed Legacy

https://arstechnica.com/gaming/2026/04/how-legacy-became-a-costly-crypto-bust-for-players-and-a-b...
1•rbanffy•30m ago•0 comments

jjj — Jujutsu Jump

https://oppi.li/posts/jjj/
1•icy•32m ago•0 comments

s&box Release

https://sbox.game/news/release-26-04-28
3•MaximilianEmel•32m ago•0 comments

Decoupling from fossil fuel: Europe's electricity 25% cheaper through renewables

https://www.euronews.com/2026/04/24/decoupling-from-fossil-fuel-shocks-europes-electricity-made-2...
2•vrganj•36m ago•0 comments