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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!

GateGraph – deterministic governance for AI agents

https://github.com/humancoreai/Gategraph
1•humancore•5m ago•0 comments

How to Learn Agentic AI in 2026 – Without Getting Lost in Hype

https://simplai.ai/blogs/how-to-actually-learn-agentic-ai-in-2026/
2•shanmugarajsk•5m ago•0 comments

I put Codex and Claude into a tank arena. Codex is winning 55% so far

https://old.reddit.com/r/codex/comments/1tgbb28/comment/omfo1by/
2•mazzystar•20m ago•0 comments

KiviDB – In Memory Store

https://kividb.io/
1•_nvp•22m ago•0 comments

Nobody understands the point of hybrid cars [video]

https://www.youtube.com/watch?v=KnUFH5GX_fI
1•CHB0403085482•23m ago•0 comments

Show HN: A CLI command to test internet speed

https://pypi.org/project/tracerate
1•rushil_b_patel•26m ago•0 comments

Litterbox: Somewhat Isolated Development Environments [video]

https://www.youtube.com/watch?v=OMCWs7qmKFc
1•Gerharddc•26m ago•1 comments

I built an AI vulnerability scanner with Claude and Codex. It failed

https://github.com/janitor-security/the-janitor
1•GhrammR•28m ago•0 comments

RCE and arbitrary file write in Vitess vtbackup via untrusted MANIFEST fields

https://neurowinter.com/security/2026/05/18/RCE-and-arbitrary-file-write-in-Vitess-vtbackup-via-u...
1•NeuroWinter•31m ago•0 comments

The Infinite Policeman – Preliminary Movement

https://medium.com/luminasticity/the-infinite-policeman-preliminary-movement-5038a293c1f2
1•bryanrasmussen•34m ago•0 comments

Playing with Jupyter style playbooks that work with Claude Code

https://old.reddit.com/r/ClaudeCode/comments/1tgdvex/playing_with_jupyter_style_playbooks_that_work/
2•bgnm2000•35m ago•0 comments

Building a Micro-Drilling Machine [video]

https://www.youtube.com/watch?v=KrStsdNG5go
1•pillars•39m ago•0 comments

Better CSS fluid sizing with round()

https://ishadeed.com/article/css-round/
1•BaudouinVH•40m ago•0 comments

Void Room – an offline writing app that does nothing on purpose

https://noirsonance.com/product/void-room/
1•Rimedag•40m ago•0 comments

Your Evals Will Break and You Won't See It Coming

https://wanglun1996.github.io/blog/your-evals-will-break.html
1•muggermuch•40m ago•0 comments

DeerFlow 2.0 – Deep Exploration and Efficient Research Flow

https://github.com/bytedance/deer-flow
1•epaga•42m ago•0 comments

More than 100 UK datacentres plan to burn gas to generate electricity

https://www.theguardian.com/business/2026/may/18/uk-datacentres-plan-to-burn-gas-to-generate-elec...
2•pera•45m ago•0 comments

SFC vs. Vizio Ruling on General Public License Compliance

https://www.dlapiper.com/en-us/insights/publications/2026/01/sfc-v-vizio-ruling-on-general-public...
1•beckford•47m ago•0 comments

Animated 3D map of Chongqing metro [video]

https://www.bilibili.com/video/BV16Z421W7o3/?spm_id_from=333.1387.homepage.video_card.click
1•decimalenough•48m ago•1 comments

2ality Blog: Temporarily Offline because of AI

https://2ality.com
1•tbassetto•50m ago•0 comments

Old Kindle e-readers will stop working on May 20th

https://goodereader.com/blog/kindle/old-kindle-e-readers-will-stop-working-on-may-20th
2•kozmonaut•50m ago•0 comments

Ask HN: Which AI harness comes close to Claude Code?

1•shivang2607•50m ago•0 comments

Code Orange: Fail Small is complete. The result is a stronger Cloudflare network

https://blog.cloudflare.com/code-orange-fail-small-complete/
2•thewisenerd•54m ago•0 comments

`Never-ending' AI slop strains corporate hacking reward schemes

https://www.ft.com/content/dbec4441-02dc-4053-8500-85677973d324
2•1vuio0pswjnm7•59m ago•1 comments

Spring Physics in my Word Game? A technical deep dive into SvelteJS animations

https://colechamberlin.substack.com/p/spring-physics-in-my-word-game
2•jessecoleman•1h ago•0 comments

Ask HN: Favorite In-Depth Deep Dives

4•vsupalov•1h ago•1 comments

Defence Tech Jobs for the week of 2026-05-18

https://defencetechjobs.substack.com/p/defence-tech-jobs-for-the-week-of-561
4•hnsa•1h ago•0 comments

Hacking a weird TV censoring device [video]

https://www.youtube.com/watch?v=a6EWIh2D1NQ
3•goodmythical•1h ago•0 comments

AI Eats the World (2026)

https://www.ben-evans.com/presentations
3•andrewjb•1h ago•0 comments

RAG vs. Fine-Tuning – The Question Every AI Builder Gets Wrong

https://thingswithai.org/posts/rag-vs-fine-tuning
2•UtkarshPatel13•1h ago•0 comments