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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!

Training NanoGPT in 39.9 Seconds

https://github.com/KellerJordan/modded-nanogpt/pull/360
1•simonpure•2m ago•0 comments

Show HN: Interactive Diesel Price Forecaster

https://sightspinner.ai/blog/diesel-prices-are-high-here-s-why-they-might-go-higher-2026-09-29.html
1•sightspinner•3m ago•0 comments

What I Learned About Asset Pricing

https://pedrosantaclara.substack.com/p/what-i-learned-about-asset-pricing
1•yarapavan•6m ago•0 comments

AI agent memory can be poisoned – and later treated as the user's own past

https://www.astraobscura.net/2026/09/28/the-memory-that-wasnt-yours/
1•rodicarsone•6m ago•0 comments

Managing access to catalogs in ScalarDB Analytics

https://medium.com/scalar-engineering/managing-access-to-catalogs-in-scalardb-analytics-a5f95e1a2872
1•josh-scalar•7m ago•0 comments

Supporting native Rust in Workers with the Emscripten target for WASM-bindgen

https://blog.cloudflare.com/rust-workers-emscripten-target/
1•CoderLim110•8m ago•0 comments

Paperclip/MtG inspired pharma strategy game

https://pharmasim.pages.dev/
1•kidzik•11m ago•0 comments

Calnode vs. calrs vs. Tymeslot: three self-hosted answers to Calendly

https://github.com/Calnode/calnode
1•shockalotti•11m ago•0 comments

Bluegraph – Explore NOAA buoy data, rebuilt in 3D from measured spectra

https://bluegraph.io/
1•polytap•20m ago•0 comments

Deterministic Testing for Multithreaded Python

https://lwn.net/Articles/1090579/
1•pykello•20m ago•0 comments

Tell HN: Firebase service causing iOS crashes across many apps

1•bilalq•21m ago•0 comments

Read anything aloud–with a voice that fits

https://ireadall.ai
1•xiaoxiexieff•24m ago•0 comments

Ask HN: Do you "Enable no talk mode?"

2•x______________•26m ago•0 comments

Highlights from Git 2.56

https://github.blog/open-source/git/highlights-from-git-2-56/
1•soheilpro•27m ago•0 comments

Singapore's Bet on Chipmaking

https://www.ft.com/content/f1c7da54-a762-4c62-bb4c-0ce4fe536900
1•ViktorRay•32m ago•0 comments

OpenAI shelves new AI model after internal safety tests: Report

https://www.channelnewsasia.com/business/open-ai-new-model-safety-6416906
1•doppp•38m ago•1 comments

How well do you know AI?

https://www.reddit.com/r/airealist/s/uhwf0kKbP5
1•msukhareva•39m ago•0 comments

Show HN: Diabetes Risk Analyzer (Flask-based web app)

https://diabetesriskanalyzer.org/
1•asrivastava1125•48m ago•1 comments

Show HN: Terminal Typing SVG

https://terminal-typing-svg.vaidikv.workers.dev/demo
1•apson•49m ago•0 comments

We found 24 Android vulnerabilities using our open source AI security agent

https://github.blog/security/how-we-found-24-android-vulnerabilities-using-our-open-source-ai-sec...
2•fourfire•54m ago•0 comments

Great Leaps in Biological Theory

https://www.asimov.press/p/great-leaps
2•signa11•58m ago•0 comments

Built Dental Scope

https://dental-scope.com/
2•Zeruxe•1h ago•3 comments

Tank Body Problem

http://www.jimsitu.com
3•jimbooonooo•1h ago•1 comments

Why Do We Exist? With Hakeem Oluseyi [video]

https://www.youtube.com/watch?v=r5KmXSLFK7c
3•binyu•1h ago•0 comments

OpenAI scraps release of Astra 6.1 model over safety issues

https://www.washingtonpost.com/technology/2026/09/28/chatgpt-maker-openai-scraps-release-astra-61...
7•lisper•1h ago•1 comments

Holo4: Powering generalist computer-use agents

https://hcompany.ai/newsroom/holo4
2•acossta•1h ago•0 comments

Show HN: Corral kill every command your agent starts

https://github.com/Cardinal44/corral
2•CG144•1h ago•0 comments

OpenAI Says It Will Not Release Newest A.I. Model Over Safety Concerns

https://www.nytimes.com/2026/09/28/technology/openai-astra-safety.html
39•jbegley•1h ago•37 comments

Show HN: Jylus – give AI systems evidence from changing data.

https://jylus.ai/try
2•JoshJH•1h ago•0 comments

Knockoff: A browser extension that filters pseudo-brand junk out of Amazon

https://github.com/Shpigford/knockoff
2•hentrep•1h ago•0 comments