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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!

Claude breached 3 firms. Phinq holds the tool call that would've stopped it

https://www.phinq.co/
1•Hythamh12•38s ago•0 comments

Asynchronous I/O in DuckDB: Work, Thread, Work

https://duckdb.org/2026/07/31/asynchronous-io
1•pdet•44s ago•0 comments

The Malleable HTML File Specification

https://malleablehtmlfile.com/
1•akagusu•1m ago•0 comments

When Agentic Glue Melts: Exploiting Cloudflare Code Mode and Workers

https://research.checkpoint.com/2026/when-agentic-glue-melts/
1•shahartal•2m ago•0 comments

50k Boat Names

https://www.beautifulpublicdata.com/boat-names/
3•jonathanmkeegan•3m ago•0 comments

Signal is working on a paid option to create an account without a phone number

https://aboutsignal.com/news/signal-login-registration-without-a-phone-number/
2•Cider9986•4m ago•0 comments

We 10×Ed Our AWS Bill by Checking Our AWS Bill

https://ultrathink.art/blog/the-cost-dashboard-that-couldnt-see-itself
2•justinpaulson•4m ago•0 comments

If you don't hear sirens, police are sure you'll feel Rumbler's acoustic assault

https://www.latimes.com/california/story/2026-08-10/lapd-rolls-out-rumbler-siren-some-fear-acoust...
2•ck2•4m ago•1 comments

Bring Back the Blue-Book Exam

https://www.theatlantic.com/magazine/2026/09/higher-education-in-person-written-exams/687954/
1•mooreds•7m ago•0 comments

Using Claude Code to reclaim mobile app privacy

https://www.thatprivacyguy.com/blog/using-claude-to-reclaim-privacy/
1•AlexanderHanff•7m ago•1 comments

Video: Elephant's leg gets trapped in an EV charger cable, mom takes out charger

https://evwire.com/p/elephant-attacks-ev-charger-china-puer-yunnan
1•juurikas•8m ago•0 comments

Apple Briefly Posts China Guide for Connecting Siri to Qwen AI

https://www.macrumors.com/2026/08/10/apple-posts-guide-for-connecting-siri-to-qwen-ai/
3•tosh•10m ago•0 comments

Category Theory Illustrated: From Sets to Categories

https://abuseofnotation.github.io/category-theory-illustrated/02_category/
1•frenchie_sans•10m ago•0 comments

The agent principal-agent problem

https://crawshaw.io/blog/agent-principal-agent
1•mooreds•10m ago•0 comments

Banking AI XSS: The exploit is in the payment reference

https://positive.security/blog/banking-ai-xss
2•breakingsystems•10m ago•0 comments

The Problem with Vibe-Coded Flattery

https://tedium.co/2026/08/09/vibe-coding-insincerity/
1•speckx•11m ago•0 comments

Turn your AI chat into a document generation engine

https://docuqueue.com/mcp
1•dvcoolarun•12m ago•0 comments

Training was just a side effect

https://fffej.substack.com/p/training-was-just-a-side-effect
1•mooreds•13m ago•0 comments

A Promising Heart Drug Fails, Challenging a Long-Held Theory of Disease

https://www.nytimes.com/2026/08/06/science/heart-disease-drug-fails-novo-nordisk.html
1•bhouston•14m ago•1 comments

Show HN: Online Speedometer

https://kmspeedometer.com/
1•artiomyak•14m ago•0 comments

I explored Tokyo and found peace there

https://www.kulman.sk/en/how-i-explored-tokyo-and-found-peace/
2•ig0r0•17m ago•0 comments

Deslopifying

https://martinsos.com/posts/deslopifying
1•matijash•18m ago•0 comments

Wellington second-hand bookstore's mysterious orders

https://www.rnz.co.nz/life/books/wellington-second-hand-book-store-s-mysterious-orders
2•lostlogin•18m ago•0 comments

Gigantic DapuStor R6060 512TB E2 NVMe SSD Shown at FMS 2026 – ServeTheHome

https://www.servethehome.com/gigantic-dapustor-r6060-512tb-e2-nvme-ssd-shown-at-fms-2026/
3•rbanffy•19m ago•0 comments

Joint Letter of AFC, Concacaf and UEFA

https://www.uefa.com/news-media/news/02a8-21501c254976-ca8bc2039a0f-1000--open-letter-to-the-foot...
3•tcp_handshaker•20m ago•0 comments

Protect Your Relays

https://www.iroh.computer/blog/authenticated-relays
1•surprisetalk•21m ago•0 comments

Can Extreme Morning Sickness Be Cured?

https://www.newyorker.com/news/essay/can-extreme-morning-sickness-be-cured
1•bookofjoe•23m ago•1 comments

SETI@Home was the coolest thing

4•b112•25m ago•0 comments

Show HN: Synchrium, a synchronized timer where remote peers meet at zero

https://synchrium.com/
1•areich•28m ago•0 comments

Pokecut: Free AI Photo Editor and Generator

https://www.pokecut.com/
1•awa11•29m ago•0 comments