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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!

Claude Token Counter, now with model comparisons

https://simonwillison.net/2026/Apr/20/claude-token-counts/
1•twapi•1m ago•0 comments

Show HN: Vitals – Score your financial health and explain what the numbers mean

https://myfinance-vitals.streamlit.app/
1•pavanhebli•10m ago•0 comments

The Rise of the Outcome Engineer

https://www.outcomeops.ai/blogs/the-rise-of-the-outcome-engineer
2•geetee•15m ago•0 comments

B2B (bot-to-bot) commerce FAQ

https://dialtoneapp.com/faq
1•fcpguru•16m ago•0 comments

Why Birds Were the Only Dinosaurs to Survive Mass Extinction

https://www.scientificamerican.com/article/an-asteroid-extinguished-all-the-dinosaurs-except-for-...
3•bryanrasmussen•18m ago•1 comments

The next segment of California's solar canal initiative

https://bsky.app/profile/dustinmulvaney.bsky.social/post/3mjtcite7qk2s
1•mooreds•18m ago•0 comments

From Worm to Human: Scaling Brain Emulation

https://pdf.isaak.net/scaling-emulations
1•andreygrehov•19m ago•0 comments

Financial aid letters aren't designed to be compared. That's the problem

https://www.dakhila.ai/blog/financial-aid-letters-arent-designed-to-be-compared
1•mayankbansal10•21m ago•0 comments

The Uncanny Valley and the Rising Power of Anti-AI Sentiment

https://localscribe.co/posts/uncanny-valley-and-rising-power-of-anti-ai-sentiment/
2•jcbritton•23m ago•0 comments

Why one of the largest digital banks chose Clojure [video]

https://www.youtube.com/watch?v=pleo1VA9D70
3•amb135cm•29m ago•0 comments

Show HN: I Spy AI – Detect AI-Generated Images, with an MCP Server

https://www.ispyai.io/
1•shawhunterm•29m ago•0 comments

Moon-joy: they should have sent a poet (so they did)

https://nothingbutawordbag.substack.com/p/moon-joy-they-should-have-sent-a
1•bryanrasmussen•30m ago•0 comments

Canada's PM calls economic ties with US a weakness that must be corrected

https://abcnews.com/Business/wireStory/canadas-prime-minister-economic-ties-us-weakness-corrected...
3•jmward01•30m ago•1 comments

OpenEMIS-MCP – human English (or Arabic) queries over a school system

1•drkhindol•33m ago•0 comments

Show HN: A lightweight way to make agents talk without paying for API usage

https://juanpabloaj.com/2026/04/16/a-lightweight-way-to-make-agents-talk-without-paying-for-api-u...
1•juanpabloaj•36m ago•0 comments

Go news Android app revamped with the help of Claude Code

https://play.google.com/store/apps/details?id=com.minaandrawos.golangnews&hl=en_US
2•minaandrawos•39m ago•1 comments

Corner-Case RCU Implementations

https://people.kernel.org/paulmck/stupid-rcu-tricks-corner-case-rcu-implementations
1•luu•44m ago•0 comments

Bank Python

https://calpaterson.com/bank-python.html
2•Redoubts•48m ago•0 comments

Show HN: TRELLIS.2 image-to-3D running on Mac Silicon – no Nvidia GPU needed

https://github.com/shivampkumar/trellis-mac
6•shivampkumar•50m ago•0 comments

How We Got the Favicon

https://thehistoryoftheweb.com/how-we-got-the-favicon/
4•valzevul•51m ago•1 comments

Tariff-refund portal is about to be America's hottest website on Monday

https://www.npr.org/2026/04/19/nx-s1-5786635/tariff-refunds-customs-ace-portal
6•rawgabbit•55m ago•0 comments

Sudo for Windows

https://github.com/microsoft/sudo
2•luispa•58m ago•1 comments

Alan Kay – Programming and Scaling (2011) [video]

https://www.youtube.com/watch?v=YyIQKBzIuBY
2•alhazrod•1h ago•0 comments

The Rich Do Pay Lower Taxes Than You (2019)

https://www.nytimes.com/interactive/2019/10/06/opinion/income-tax-rate-wealthy.html
3•johnbarron•1h ago•2 comments

My Life Story in a Nutshell

https://jsavage.xyz/2026/04/11/im-back-heres-my-life-story-in-a-nutshell/
2•JSavageOne•1h ago•0 comments

Is Money Worth Moving For?

https://whattoaskfor.com/
2•ForgetToRead•1h ago•0 comments

Looking back on Stripe's payment API migration

https://jacobbrazeal.wordpress.com/2026/04/19/review-stripes-payments-apis/
4•tibbar•1h ago•1 comments

Iowa went all-in on school choice

https://www.npr.org/2026/04/19/nx-s1-5683199/education-school-choice-iowa-students-charter-school...
2•freeopinion•1h ago•0 comments

Nostr-powered E2EE Collaboration platform powered by Marmot Protocol

https://www.lemonwire.work/
2•jdbohrman•1h ago•0 comments

How to get Hired at a Startup (as a student)

https://twitter.com/robechun/status/2045974706470404589
2•altrum•1h ago•0 comments