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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•11mo 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!

Stealth Satellite TV Defeats Iran's Internet Blackout

https://spectrum.ieee.org/iran-internet-blackout-satellite-tv
1•WaitWaitWha•31s ago•0 comments

What If Being a "Real Man" Is the Trap?

https://lylewfass.substack.com/p/the-fraternity-of-contempt
1•nursehax•2m ago•0 comments

Arguing with Agents

https://blowmage.com/2026/04/14/arguing-with-agents/
1•asaaki•3m ago•0 comments

Most People Measure Brightness

https://www.motivenotes.ai/p/motive-force
1•AnhTho_FR•5m ago•0 comments

Jury finds that Live Nation acted as a monopoly and overcharged ticket buyers

https://text.npr.org/nx-s1-5786715
1•hi41•7m ago•1 comments

xAI prepares credits system for upcoming Grok Build launch

https://www.testingcatalog.com/xai-prepares-credits-system-for-upcoming-grok-build-launch/
2•gmays•15m ago•1 comments

7.0 Thermal Control. Of Small Spacecraft Technology

https://www.nasa.gov/smallsat-institute/sst-soa/thermal-control/
1•totetsu•15m ago•0 comments

Cloudflare's Project Think

https://blog.cloudflare.com/project-think/
1•p0u4a•17m ago•0 comments

300-unit-per-second roll-to-roll manufacturing of visible metalenses

https://www.nature.com/articles/s41586-026-10369-y
1•yeonsh•19m ago•1 comments

Fibroblasts of disparate developmental origins harbor scarring potential

https://www.cell.com/cell/abstract/S0092-8674(25)01427-8
1•gnabgib•26m ago•0 comments

Keycard – inject API keys into subprocesses, never touch shell env

https://www.keycard.studio/
2•jijane•39m ago•0 comments

Why facial scars are smaller than back scars

https://www.nature.com/articles/d41586-026-01044-3
1•bookofjoe•39m ago•1 comments

Show HN: Object Storage Comparisons

https://storage.mixpeek.com
1•Beefin•40m ago•0 comments

Pi Hard

https://www.youtube.com/watch?v=CNbmoVdirxw
1•Fr0styMatt88•43m ago•0 comments

The AI Debacle

https://justintallant.com/the-ai-debacle
1•jtallant•51m ago•0 comments

Free open source AI Editor

https://github.com/MeepCastana/KubeezCut
1•Meeeeeep•51m ago•0 comments

A Better Ludum Dare; Or, How to Ruin a Legacy

https://ldjam.com/events/ludum-dare/59/$425291/$425292
2•raincole•51m ago•0 comments

Show HN: Leaking AWS Keys from a Trading Competition Sandbox via stdout

https://github.com/JakOb-dotcom/cloud-sandbox-security-analysis/
1•JakOb-dotcom•52m ago•0 comments

Show HN: Flint – A 30B model fine-tuned for less repetition

https://springboards.ai/models/flint-alpha
2•thmsmxwll•53m ago•0 comments

China's Parallel Web Behind the Wall

https://vale.rocks/posts/chinas-web
2•cainxinth•55m ago•0 comments

Someone Had a Good Idea

https://hecanjog.com/blog/2026/4/15/
1•hecanjog•56m ago•0 comments

Pico.css v2.2.0-beta released [community fork]

https://github.com/anyblades/pico
1•anydigital•57m ago•1 comments

Query LLMs like a graph database [video]

https://www.youtube.com/watch?v=8Ppw8254nLI
1•glimps•1h ago•1 comments

Show HN: Gave Claude a casino bankroll – it gambles till it's too broke to think

https://letaigamble.com/
3•mackbrowne•1h ago•1 comments

EU AI Act: curated tools, official sources, templates, and OSS

https://github.com/GenAI-Gurus/awesome-eu-ai-act
1•carloshvp•1h ago•0 comments

Miami-Dade is losing residents

https://www.miamiherald.com/opinion/editorials/article315344371.html?taid=69dd96484cd2160001d62a5...
2•paulpauper•1h ago•0 comments

Another Erdos Problem Solved

https://www.erdosproblems.com/forum/thread/1196
1•paulpauper•1h ago•0 comments

ChatGPT's latest stylistic quirk is sinister, infuriating – and everywhere

https://www.theguardian.com/commentisfree/2026/apr/15/chatgpt-stylistic-quirk-its-not-x-its-y
4•Anthony-G•1h ago•0 comments

Google geofence data used to identify murder suspect unconstitutional

https://www.startribune.com/minnesota-supreme-court-rules-google-geofence-data-used-to-identify-m...
1•bradleyankrom•1h ago•0 comments

South Korea plans to use the Iran crisis to spur a renewables revolution

https://www.theguardian.com/world/2026/apr/16/south-korea-solar-power-renewables-revolution
7•billybuckwheat•1h ago•0 comments