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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!

Extracted Value

https://extractedvalue.com/
1•turtleyacht•1m ago•0 comments

Multi Pong – multiplayer pong game

https://multi-pong.projects.lasz.uk/
1•dr_kretyn•1m ago•0 comments

New V4 encryption format that supports hardware-bound encryption using Yubikeys

https://www.vaultsort.com/
2•VaultSort•3m ago•0 comments

Epoll vs. Io_uring in Linux

https://sibexi.co/posts/epoll-vs-io_uring/
2•Sibexico•6m ago•0 comments

The Tiny Sailing Game That Feels Surprisingly Real [video]

https://www.youtube.com/watch?v=30n_fdzgjJA
2•coolwulf•6m ago•0 comments

Russia's Putin is spending $26B to live forever

https://startupfortune.com/russias-putin-is-spending-26-billion-to-live-forever/
1•insanetech•7m ago•0 comments

First Pure-Go Cubrid Driver: Gocubrid

https://hexacluster.ai/blog/announcing-first-pure-go-cubrid-driver-gocubrid
1•avivallssa•10m ago•1 comments

South Korea Could Build Nuclear Submarines, but It Shouldn't

https://warontherocks.com/south-korea-could-build-nuclear-submarines-but-it-shouldnt/
1•bear_with_me•11m ago•0 comments

Show HN: Callimachus – Local search across your AI coding-agent history

https://github.com/BetaBots-LLC/callimachus
2•arishaller•13m ago•2 comments

Not just books: renting a sewing machine from the library can improve democracy

https://www.bbc.com/future/article/20260618-the-weird-and-wonderful-libraries-of-finland
7•sohkamyung•19m ago•0 comments

Jobflo – A local-first job tracker built with SwiftUI

https://lymegrove.com/jobflo/
1•jsrothwell•19m ago•0 comments

Adblock Plus doing just fine after updating to Manifest V3 two years ago

https://blog.adblockplus.org/blog/adblock-plus-doing-just-fine-after-updating-to-manifest-v3-two-...
3•twapi•21m ago•1 comments

Turns Out, There Is a Cabal of Elite Crazies Trying to Control the World

https://www.esquire.com/news-politics/politics/a71619211/peter-thiel-dialog-club-wired-report/
30•throwaway81523•22m ago•4 comments

Show HN: Domvault – self-hostable second brain with consent-based note sharing

https://github.com/dys5315/domvault
3•quietdrift_04•23m ago•0 comments

Why Amazon hates 'human-in-the-loop' AI governance

https://www.theregister.com/security/2026/06/20/why-amazon-hates-human-in-the-loop-ai-governance/...
4•ano-ther•24m ago•0 comments

28% Faster: Blink Prototype That Shows Why Apple iOS Browser Engine Ban Must End

https://open-web-advocacy.org/es/blog/28-percent-faster--the-blink-prototype-that-shows-why-apple...
3•SoKamil•25m ago•1 comments

Lessons from wasps on how societies survive power struggles

https://www.ucl.ac.uk/news/2026/may/comment-lessons-wasps-how-societies-survive-power-struggles
4•hhs•25m ago•0 comments

One Prompt Agentic AI Marketing for Game Developers

https://www.youtube.com/watch?v=B2ASCTomtIA
3•bingewave•26m ago•0 comments

'Buy less' campaigns don't work

https://www.lse.ac.uk/buy-less-campaigns-dont-work
4•hhs•29m ago•0 comments

FunnyBench – Can AI Models Tell Funny Jokes?

https://funnybench.lol
3•Mockapapella•29m ago•1 comments

Stop calling the Super Productionizer a 'baby blender' – Frank Elavsky

https://www.frank.computer/blog/2025/06/baby-blender.html
13•cratermoon•30m ago•2 comments

Researchers used math to crack Wordle

https://www.binghamton.edu/news/story/6327/s-m-a-r-t-these-researchers-used-math-to-crack-wordle
4•hhs•34m ago•1 comments

Show HN: TLA+ Process Studio

https://tlaplus-process-studio.com/?example=meeting-lifecycle
5•uptodatenews•35m ago•0 comments

Pre-2022 Books

https://notes.lorenzogravina.com/musings/pre-2022-books
34•trms•37m ago•17 comments

I can haz smoller NixOS ISOs?

https://natkr.com/2026-06-19-nixos-but-smol/
7•birdculture•41m ago•0 comments

Show HN: Maccha – Cross Agent Brain for Antigravity, Claude Code, OpenCode etc.

https://github.com/KarelTestSpecial/real-agent-setup
4•kareldecherf•42m ago•1 comments

Show HN: Onsight: pay a local to photograph any spot in San Francisco, on demand

https://onsight.photo/san-francisco
6•pro_methe5•42m ago•1 comments

Show HN: Cruit – Get Hired directly from your coding agent

https://cruit.dev
3•nwang783•45m ago•0 comments

Trump DOJ Outlines Dubious Path to Force People into Psychiatric Institutions

https://www.motherjones.com/politics/2026/06/trump-doj-memo-olmstead-psychiatric-disabilities-ins...
7•hn_acker•47m ago•2 comments

Show HN: Save, an API that turns any URL into clean Markdown for LLMs

https://www.savemarkdown.co/api/
3•jswallez•48m ago•0 comments