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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!

GPT-6 Astra on robot arms

https://openai.robocurve.org/gpt-6-astra/
1•Anon84•3m ago•0 comments

Release containerd 2.3.5 · containerd/containerd

https://github.com/containerd/containerd/releases/tag/v2.3.5
1•kyisaiah47•7m ago•0 comments

The Next Big Opportunity in Data Centers: Insuring Them

https://www.wsj.com/finance/the-next-big-opportunity-in-data-centers-insuring-them-f133f3cb
1•thm•12m ago•0 comments

80k-year-old "arrowheads" rewrite human history

https://www.sciencedaily.com/releases/2026/09/260903064233.htm
1•gradus_ad•12m ago•0 comments

Founders School

https://founders.school
1•ungreased0675•17m ago•1 comments

Show HN: Nocturne, hide the Mac menu bar clock, or hide everything but the clock

https://github.com/dotcomjack/nocturne
1•dotcomjack•17m ago•0 comments

One new Swiss company in thirty-six now claims AI

https://prospex.ch/blog/ai-companies-in-switzerland-what-the-commercial-register-shows/
1•mial•31m ago•0 comments

Captcha in LinkedIn is not working while signing up from LibreWolf

1•Hannbal•33m ago•0 comments

Ask HN: Why don't we bring back old school OkCupid?

2•firefax•38m ago•2 comments

Linguistic Drift at the Frontier

https://pydantic.dev/articles/linguistic-drift-at-the-frontier
2•hummusFiend•42m ago•0 comments

Gateside by TSA Precheck

https://www.tsa.gov/precheck/gateside-tsa-precheck
3•minhduong243•43m ago•0 comments

Why the chicken crossed the road, according to various entities

https://dynomight.net/chicken/
2•Curiositry•43m ago•0 comments

Emergent cheating and whistleblowing in autonomous research swarms

https://arxiv.org/abs/2609.04170
2•anigbrowl•48m ago•0 comments

How to make your agent do its own support

https://mmoustafa.com/blog/2026/09/05/how-to-make-your-agent-do-its-own-support/
2•mmoustafa•48m ago•0 comments

Asahi Linux Supports M3

https://asahilinux.org/2026/09/m2-episode-1/
5•LorenDB•54m ago•2 comments

I hate Wispr Flow so much

https://www.nytimes.com/2026/08/19/magazine/ai-dictation-app-wispr.html
2•paaloeye•55m ago•1 comments

GPT-6 Astra recreated the Palace of Fine arts in Blender

https://twitter.com/sharifshameem/status/2095688352075075878
2•handfuloflight•1h ago•0 comments

When Code Is Abundant

https://about.gitlab.com/blog/when-code-is-abundant/
3•gmays•1h ago•0 comments

Manifolds, differential forms, and multivariable calculus

https://hidden-phenomena.com/articles/diff-forms
1•measurablefunc•1h ago•0 comments

Limitations of Perceptual Image Metrics

https://halide.cx/blog/metric-limits/
2•computerbuster•1h ago•0 comments

Show HN: Cowbull – Wordle-like game where you only get match counts

https://cowbull.co/
2•ajayvk•1h ago•1 comments

Sentrux: Codebase Architectural Sensor

https://sentrux.dev/
2•handfuloflight•1h ago•0 comments

Show HN: CocoCut – A zero-cloud, 1-second video diary engine built with Flutter

https://cococut.app/en
1•xcc3641•1h ago•1 comments

V1.0.0 – the complete fourteen-channel atlas

https://letenergyflow.app/
2•MuzikPro•1h ago•0 comments

The Netherlands Will Never Be Rid of Louisiana Crawfish

https://www.theatlantic.com/science/2026/09/american-crayfish-netherlands-eating/688430/
3•bookofjoe•1h ago•2 comments

Not Everything Digital Is Good: Tech Isn't Always an Example of Genius

https://thewalrus.ca/not-everything-digital-is-good-tech-isnt-always-an-example-of-genius/
4•pseudolus•1h ago•0 comments

Flux Releases Adafruit from CFAA Claims

https://www.courtlistener.com/docket/73450247/adafruit-industries-llc-v-defy-gravity-inc/
1•snitty•1h ago•1 comments

GitHub Status – Disruption with Copilot Code Review

https://www.githubstatus.com/incidents/zw1hbx2yyhvr
2•kyisaiah47•1h ago•0 comments

Show HN: I made a retro falling block puzzle, with a twist ;)

https://blocknado.app/marathon
2•jamwise•1h ago•1 comments

Solvedfeed – agents share the errors they hit, and the fixes

https://solvedfeed.com/
1•solvedfeed_agen•1h ago•1 comments