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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!

The Wall of Shame

https://gagor.pro/2026/04/the-wall-of-shame/
1•___timor___•3m ago•0 comments

Verum, examined – a systems language for an age when humans write less code

https://verum-lang.org/blog/verum-examined
1•old8man•4m ago•0 comments

Show HN: Free PDF redactor that runs client-side

https://redactpdf.net
1•MrGuacamole•4m ago•0 comments

Presentator: Free and Open source design feedback and presentation platform

https://presentator.io/
1•thunderbong•6m ago•0 comments

Six Levels of Dark Mode

https://cssence.com/2024/six-levels-of-dark-mode/
2•Akcium•7m ago•0 comments

I Created OpenClaw – Peter Steinberger, TedTalk, YT)

https://www.youtube.com/watch?v=7rzYDM6vMtI
1•hbarka•7m ago•0 comments

A more troubling picture of sea level rise is coming into view

https://e360.yale.edu/features/sea-level-rise-land-subsidence
2•Brajeshwar•8m ago•0 comments

Europe has 'maybe six weeks of jet fuel left'

https://www.bbc.com/news/articles/czjw2kz0l22o
2•measurablefunc•11m ago•0 comments

PerryTS: Compile TypeScript to native executables with LLVM

https://www.perryts.com/
1•simjnd•14m ago•0 comments

Sagas vs. Process Managers

https://docs.eventsourcingdb.io/blog/2026/04/20/sagas-vs-process-managers/
1•goloroden•16m ago•0 comments

Epistemic Suicide: Why AI Is Collapsing into Mediocrity

https://medium.com/@erinacius4455/full-linkedin-article-english-version-6611a87d02c5
1•alex_gold•19m ago•0 comments

Cardynal – AI support agent for businesses, no code, WhatsApp and web chat

https://cardynal.io
1•Cardynal•19m ago•0 comments

Can You Hear an Ambulance Moving Faster Than Sound?

https://snoeprol.github.io/science/doppler-effect.html
1•Snoeprol•21m ago•0 comments

NNA (Natural Number Array)

https://users.rust-lang.org/t/this-is-my-first-project-i-invented-a-new-algorithm-that-even-ai-do...
1•Erenay09•23m ago•1 comments

PostgresBench: A Reproducible Benchmark for Postgres Services

https://clickhouse.com/blog/postgresbench
1•saisrirampur•25m ago•0 comments

New CDC pick may face "threat to follow ideology over evidence," ex-official say

https://www.cbsnews.com/news/jerome-adams-erica-schwartz-face-the-nation-surgeon-general-kennedy-...
1•rolph•27m ago•0 comments

Wind and solar power surge across the Mountain West as demand tests the grid

https://www.kunr.org/local-stories/2026-04-14/wind-solar-power-surge-mountain-west
1•Bender•29m ago•0 comments

Uber's AI Push Hits a Wall–CTO Says Budget Struggles Despite $3.4B Spend

https://finance.yahoo.com/sectors/technology/articles/ubers-anthropic-ai-push-hits-223109852.html
3•dakiol•29m ago•0 comments

Bronx officials try to rein social media 'takeovers' after events turn chaotic

https://gothamist.com/news/bronx-officials-try-to-rein-in-social-media-takeovers-after-winter-eve...
1•gnabgib•30m ago•0 comments

Fixing Unix Filenames (2009)

https://dwheeler.com/essays/fixing-unix-linux-filenames.html
2•LorenDB•33m ago•2 comments

How Can Make

https://www.forumvc.com
1•dongtam•35m ago•0 comments

Do Not Default to a Public VPN

https://avkcode.github.io/blog/do-not-default-to-a-vpn.html
1•KyleVlaros•41m ago•1 comments

The Missing Human Half of AI

https://www.utkarshapoorva.com/writing/missing-human-half-of-ai/
1•utkarsh_apoorva•42m ago•1 comments

Musk's SpaceX urges Trump to crack down on EU satellites

https://www.telegraph.co.uk/business/2026/04/19/musks-spacex-urges-trump-to-crackdown-on-eu-satel...
3•doener•44m ago•0 comments

An explainer of the invisible temporal logic shaping platform behavior

https://github.com/Dario-Chang/The-Invisible-Logic-Regulators-Missed-for-23-Years-How-Platforms-R...
1•governace-layer•47m ago•1 comments

After 6 months I shipped Transita found a niche I could build for

https://transita.app
1•snenenenene•47m ago•0 comments

"Now I Have the Full Picture"

https://taoofmac.com/space/notes/2026/04/19/1400
3•rcarmo•49m ago•0 comments

They Went Abroad to Save Money. Moving Back Seems Unaffordable

https://www.nytimes.com/2026/04/19/business/americans-abroad-cheaper-living-costs.html
2•mikhael•51m ago•0 comments

The Unsuitability of English (2015)

https://www.chronicle.com/blogs/linguafranca/the-unsuitability-of-english
1•downbad_•52m ago•1 comments

A Chinese Android just ran a half-marathon faster than any human

https://www.cnn.com/2026/04/19/china/china-robot-half-marathon-intl-hnk
8•Bender•58m ago•1 comments