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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!

White House probes wave of missing or dead American scientists

https://www.foxnews.com/video/6393235356112
1•genphy1976•53s ago•0 comments

EsoNatLangs: Esolangs that embrace the complexities of natural language

https://esoteric.codes/blog/five-esonatlangs
1•xpointer•2m ago•0 comments

How to Build an Agent Or: The Emperor Has No Clothes (2025)

https://ampcode.com/notes/how-to-build-an-agent
1•tehnub•5m ago•0 comments

Sidephone: A minimalist Android phone with swappable USB keypads

https://www.sidephone.com/
1•phantomathkg•6m ago•0 comments

Georgia's Voting Technology Blunder

https://pluralistic.net/2026/04/18/dominion-sucks-actually/
1•hn_acker•7m ago•0 comments

Matt Mullenweg Says "The Wheels Have Fallen Off" in WordPress

https://www.therepository.email/matt-mullenweg-says-the-wheels-have-fallen-off-in-wide-ranging-wo...
2•rpgbr•9m ago•0 comments

Information Scent: How Users Decide Where to Go Next (2020)

https://www.nngroup.com/articles/information-scent/
1•alberto-m•10m ago•0 comments

Unearthly Terrors: Event Horizon (1997)

https://theasc.com/magazine/aug97/event/main.htm
2•exvi•15m ago•0 comments

The USDA's gardening zones have shifted. (Interactive app and map)

https://apps.npr.org/plant-hardiness-garden-map/
2•nuke-web3•15m ago•0 comments

They Were YouTube's First Stars. Here's What They Wish They'd Known

https://www.nytimes.com/2026/04/15/arts/television/early-youtube-stars-success-learnings.html
1•cainxinth•16m ago•0 comments

'Tokenmaxxing' is making developers less productive than they think

https://techcrunch.com/2026/04/17/tokenmaxxing-is-making-developers-less-productive-than-they-think/
3•Brajeshwar•19m ago•1 comments

The electromechanical angle computer inside the B-52 bomber's star tracker

https://www.righto.com/2026/04/B-52-star-tracker-angle-computer.html
1•NelsonMinar•19m ago•0 comments

Guy is a legend (Founder of StopKillingGames before Parliment) [video]

https://www.youtube.com/watch?v=FoDZMcTTHGo
1•Bender•21m ago•0 comments

Version 1.0 of WireGuard for Windows and WireGuardNT Released

https://lists.zx2c4.com/pipermail/wireguard/2026-April/009580.html
1•zx2c4•21m ago•0 comments

Don't just quit. Leave with leverage. An open-source employment attorney via .md

https://github.com/bobbypartyai-dev/ai-quit-job
2•rk3000•23m ago•0 comments

The Things I Wanted to Know Before Buying Apple's Studio Display XDR

https://blog.tymscar.com/posts/studiodisplayxdr/
3•tymscar•24m ago•0 comments

C64GFX – Commodore 64 Pixel Art Gallery

https://c64gfx.com/index.html
1•adunk•25m ago•0 comments

China's HH-200 Cargo Drone Flies First Mission with 1.5-Ton Load

https://dronexl.co/2026/04/18/china-200-cargo-drone-mission/
1•HardwareLust•26m ago•0 comments

We built our own DNS server

https://sliplane.io/blog/how-we-built-our-own-dns-server
1•jonas_scholz•27m ago•0 comments

Artemis Was a State Failure and a Human Triumph

https://www.bloomberg.com/opinion/features/2026-04-14/nasa-s-artemis-moon-mission-was-a-state-fai...
2•object-a•29m ago•1 comments

Capital One Credit Balance Refund Business Logic Flaw

https://nuxx.net/blog/2026/04/18/capital-one-credit-balance-refund-business-logic-flaw/
1•c0nsumer•30m ago•0 comments

Despedify – AI-powered planner to end WhatsApp chaos for group trips

https://despedify.es/
1•edgar_dev•33m ago•0 comments

The AI Doomers Who Are Playing with Fire

https://gizmodo.com/the-ai-doomers-who-are-playing-with-fire-2000747606
4•booleanbetrayal•36m ago•0 comments

I Stumbled Across My Boyfriend's ChatGPT and It Ended Our Relationship

https://lindseyhallwrites.substack.com/p/i-read-my-boyfriends-chatgpt-and
5•atmosx•38m ago•1 comments

Hacking the EU AgeVerification app in under 2 minutes

https://twitter.com/Paul_Reviews/status/2044723123287666921
1•croes•39m ago•0 comments

Nothing prepares you for the death of a pet

https://spectator.com/article/nothing-prepares-you-for-the-death-of-a-pet/
2•mellosouls•40m ago•1 comments

Opus 4.7 to 4.6 Inflation is ~45%

https://tokens.billchambers.me/leaderboard
3•anabranch•40m ago•1 comments

The Great Pyramid of Giza and the Speed of Light

https://www.johndcook.com/blog/2026/04/09/pyramid-speed-of-light/
1•rolph•41m ago•0 comments

Amazon won't release Fire Sticks that support sideloading anymore

https://arstechnica.com/gadgets/2026/04/amazon-wont-release-fire-sticks-that-support-sideloading-...
26•pjmlp•41m ago•19 comments

How the word "MODEL" changes meaning across 3D Graphics, Software and AI

https://www.youtube.com/watch?v=S7NVbkVXtzo
1•0bytematt•48m ago•0 comments