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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!

Starbucks Is One of the Largest Banks

https://www.msn.com/en-us/money/companies/starbucks-is-secretly-one-of-the-world-s-largest-banks/...
1•ColinWright•2m ago•0 comments

Guy in his basement invents a drug to treat Alzheimer's disease

https://twitter.com/DouglasYaoDY/status/2070904914050797582
1•binyu•4m ago•0 comments

NASA tests AI medic for astronauts too far from Earth to call a doctor

https://www.theregister.com/ai-and-ml/2026/06/27/nasa-tests-ai-medic-for-astronauts-too-far-from-...
1•LorenDB•4m ago•0 comments

Show HN: Sambee – browser-based file manager for SMB shares and local drives

https://sambee.net
1•helgek•5m ago•0 comments

Warp Point: A curated webring of video game websites

https://www.warppoint.games/
1•mysterydip•5m ago•0 comments

The crowd-funded Porsche 911

https://project996.fun
1•mhavelka77•7m ago•2 comments

Show HN: Parseflow – Extract data from any document. Entirely on your Mac

https://www.parseflow.io/
1•devtanna•13m ago•0 comments

Beyond symbolic algebra with quantum picturalism

https://www.frontiersin.org/journals/cognition/articles/10.3389/fcogn.2026.1790789/full
1•mathgenius•14m ago•0 comments

Denoising Voice Recordings On-Device

https://www.duration.ai/blog/denoising-voice-recordings-on-device
1•sudb•16m ago•0 comments

Ask HN: Are OTA updates for native iOS/Swift apps allowed?

1•jackappdev•18m ago•0 comments

Cypherpunk Library

https://www.cypherpunklibrary.com/collection
1•bookofjoe•19m ago•0 comments

Nearly Three-Quarters of Dutch Responses to EU Tobacco Rules Were AI-Generated

https://pointer.kro-ncrv.nl/meerderheid-nederlandse-inspraak-op-strengere-eu-tabakswet-afkomstig-...
2•stefanvdw1•23m ago•0 comments

Ask HN: If someone invested $100k now for your startup, how would you spend it?

4•aurenvale•28m ago•0 comments

Tldr.fail – buggy servers break PQ KEX compatibility in TLS

https://tldr.fail/
1•basilikum•30m ago•0 comments

Kids Act Would Require Age Checks to Get Online

https://www.eff.org/deeplinks/2026/06/kids-act-would-require-age-checks-get-online
2•bilsbie•31m ago•0 comments

CORS Explained in Plain English

https://sanyamserver.online/posts/cors/
1•RickJWagner•31m ago•0 comments

More evidence of life on Mars but still no life

https://www.cbc.ca/radio/quirks/more-evidence-of-life-on-mars-but-still-no-life-1.7649645
9•pseudolus•32m ago•2 comments

From Prompts to Loops: Building Autonomous Coding Agents

https://animeshgaitonde.medium.com/from-prompts-to-loops-building-autonomous-coding-agents-6135bf...
1•animesh371g•34m ago•0 comments

Expect Claude Fable 5 to Be Turned Back on in a Matter of Days, Report Says

https://gizmodo.com/expect-claude-fable-5-to-be-turned-back-on-in-a-matter-of-days-report-says-20...
2•HiroProtagonist•35m ago•0 comments

Beyond Functional Programming: The Verse Programming Language (2022) [pdf]

https://simon.peytonjones.org/assets/pdfs/haskell-exchange-22.pdf
1•tosh•35m ago•0 comments

France records around 1k additional deaths amid extreme heat wave

https://apnews.com/article/europe-heat-temperature-records-france-deaths-germany-61f444317600cf1b...
2•geox•35m ago•0 comments

Almavivo – The On-Device Health Platform

https://almavivo.com
2•morog•39m ago•0 comments

Policy Pulse – Issue #21 – Week of June 27, 2026

https://blog.disclose.io/policy-pulse-issue-21-week-of-june-27-2026/
1•jruohonen•41m ago•0 comments

Show HN: Warren – run isolated instances of any CLI tool (no containers,no root)

https://github.com/swadhinbiswas/warren
1•0xER•42m ago•0 comments

Shadcn/UI components that can be used without react

https://basecoatui.com/
2•buckwheatmilk•43m ago•1 comments

Imagine Telling Someone in 1999

https://twitter.com/JesseTinsley/status/2070306180543500530
1•ksec•44m ago•0 comments

Show HN: Genius AI Detector

https://geniusaidetector.com/
2•Rudism•44m ago•0 comments

GhostGrid drift detection and edge tamper evidence via Ed25519

https://ghostgrid.dannygc.cloud/
1•aisoverighn•45m ago•0 comments

Artificial rain isn’t a solution to drought, according to a cloud-seeding expert

https://www.swissinfo.ch/eng/climate-adaptation/why-artificial-rain-is-not-a-solution-to-drought/...
1•giuliomagnifico•45m ago•0 comments

Perceus: Garbage free reference counting with reuse

https://dl.acm.org/doi/10.1145/3453483.3454032
1•fanf2•45m ago•0 comments