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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!

Who Owns the Model of You?

https://0set0set.github.io/articles/alma-a-self-model-for-ai-agents/
1•0set0set•1m ago•0 comments

Apple Is Going to Raise Device Prices – But When?

https://daringfireball.net/linked/2026/06/22/apple-device-prices-when
1•tosh•3m ago•0 comments

EV demand powers Europe car market in May, Chinese rivals expand share

https://www.reuters.com/world/china/ev-demand-powers-europe-car-market-may-chinese-rivals-expand-...
1•JumpCrisscross•3m ago•0 comments

Object Oriented Semantic Layer

https://medium.com/@tkfbcny/object-oriented-semantic-layer-5e57ac66af53
1•kassette•3m ago•0 comments

Recommendations for Using LLM-Backed Generative AI in FOSS Contributions

https://sfconservancy.org/llm-gen-ai/llm-backed-generative-ai-recommendations.html
1•pella•4m ago•0 comments

Show HN: Aharness – Enforce coding-agent workflows as state machines on Codex

https://github.com/Alfredvc/aharness
1•alfredvc•5m ago•0 comments

MicroSphere – The indie web on your device

https://micro.mjanssen.nl/microsphere/
1•marc0janssen•5m ago•1 comments

It's Only When You Look Back

https://www.markround.com/blog/2026/06/17/25-its-only-when-you-look-back/
1•mark_round•5m ago•0 comments

Unlimited OCR Works

https://arxiv.org/abs/2606.23050
1•ilreb•6m ago•0 comments

What Are AI Agents? A 2026 Definition, Types, and Why 95% Never Reach Production

https://news.ycombinator.com/submit
1•Deepyanti•8m ago•0 comments

Chatting with an AI Won't Make You a Top Programmer

https://lemire.me/blog/2026/06/21/chatting-with-ai-wont-make-you-a-top-programmer/
1•ibobev•8m ago•0 comments

Ultra-Wide 0.5x Lenses Have Utility Beyond 'Photography'

https://daringfireball.net/linked/2026/06/22/ultra-wide-05x-lenses-have-utility-beyond-photography
1•tosh•8m ago•0 comments

A Python tool to scan browser extension packages for malware

https://github.com/ernos/browser-xpi-malware-scanner
1•pebnop•8m ago•1 comments

Anki – Powerful, Intelligent Flashcards

https://apps.ankiweb.net/
1•StefanBatory•9m ago•0 comments

Ask HN: How are pro-LLM projects doing compared to anti-LLM ones?

1•pullshark91•10m ago•1 comments

A Next.js SaaS Boilerplate - Ship your SaaS faster

https://yousship.com
11•ybenarab•14m ago•0 comments

The Way to Protect Your Digital Privacy

https://hister.org/posts/the-ultimate-way-to-protect-digital-privacy
4•mstef•14m ago•0 comments

p99 0ms* Autocomplete

https://ruurtjan.com/articles/p99-0ms-autocomplete-for-240-million-domain-names
1•pul•19m ago•0 comments

Meta to invest $900M in India's CRED, taps founder to lead WhatsApp

https://www.reuters.com/world/india/indian-fintech-firm-cred-raise-900-million-meta-45-billion-va...
1•rakkhi•19m ago•0 comments

Car Hacking with Claude Code

https://www.csselectronics.com/pages/can-bus-reverse-engineering-ai-llm-claude
1•martinfalch•20m ago•0 comments

Europol is going rogue – so Brussels is doubling its budget?

https://euobserver.com/222391/europol-is-going-rogue-so-brussels-is-doubling-its-budget/??
2•austinallegro•24m ago•0 comments

Vietnamese US deportee returns home after a year in South Sudan

https://www.eyeradio.org/joyful-to-return-home-vietnamese-us-deportee-returns-home-after-a-year-i...
2•_tk_•25m ago•0 comments

Signed OKF – Provenance for Google's Open Knowledge Format

https://github.com/dynamicfeed/signed-okf
2•dynamicfeedai•27m ago•0 comments

Ian Fleming Explains How to Write a Thriller

https://lithub.com/ian-fleming-explains-how-to-write-a-thriller/
3•frereubu•27m ago•0 comments

We built the fastest API for GLM-5.2

https://twitter.com/philipkiely/status/2069212319746506968
2•ljosifov•28m ago•0 comments

The curious history the invention of the CMD+K quick switcher

https://ux.stackexchange.com/questions/153299/how-did-cmd-k-come-to-be-the-standard-shortcut-for-...
2•birdculture•33m ago•0 comments

Digital Health Tools Are Reshaping Healthcare in the United States

https://nyulangone.org/news/digital-health-tools-are-reshaping-healthcare-united-states
2•giuliomagnifico•38m ago•0 comments

Kafka's Broken Promise: There Is No Goldilocks Log

https://www.opendata.dev/blog/announcing-opendata-log/
3•rmoff•40m ago•0 comments

Israel targeted Gaza children resulting in genocide, UN inquiry says

https://www.reuters.com/world/middle-east/israel-targeted-gaza-children-resulting-genocide-un-inq...
110•supercopter•41m ago•28 comments

We ran 1k queries through ChatGPT: 48 domains produced 22.5% of citations

https://growtika.com/blog/chatgpt-citation-economy
4•Growtika•42m ago•0 comments