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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!

Keystone – deterministic execution vault with replay‑verifiable proof

https://github.com/cryptictyrant519/keystone-proof
1•DevTyrant519•25s ago•1 comments

TimeFlies – convert flight info to calendar

https://ozgur.ca/projects/time-flies
1•sedatk•48s ago•0 comments

AI is making answers cheap. Curiosity is priceless

https://www.fastcompany.com/91556703/ai-is-making-answers-cheap-curiosity-is-priceless
1•ohjeez•1m ago•0 comments

An In-Browser Visualizer for GPS Satellites

https://hackaday.com/2026/06/18/an-in-browser-visualizer-for-gps-satellites/
1•gnabgib•1m ago•0 comments

PostmarketOS v26.06 (Alpen Avocado) released

https://postmarketos.org/blog/2026/06/21/v26.06-release/
1•kokada•3m ago•0 comments

Give the Baby Peanut Butter

https://www.thefp.com/p/give-the-baby-peanut-butter-allergy
1•mhb•6m ago•0 comments

The Cult of LK99

https://www.youtube.com/watch?v=fj3WwMxUDZ8
2•EwanG•9m ago•1 comments

Norway Bans AI for Kids 6-13 in Schools

https://yipzap.com/norway-bans-ai-for-kids-6-13-in-schools-a-bold-move-against-tech-dependency/
1•noida•10m ago•1 comments

Exhaustive and Definitive Ranking of All NES Games Released in North America

https://8bitnintendo.science/
2•CharlesW•11m ago•0 comments

Fast-tracked power plants fuel AI boom, with little public scrutiny

https://www.reuters.com/business/energy/fast-tracked-power-plants-fuel-ai-boom-with-little-public...
1•JumpCrisscross•11m ago•0 comments

Freelance Hiring, Without the Chaos

https://hight.ai
1•YinkaIyiola•12m ago•0 comments

Futuristic Japanese Warship Is on the Market and Winning Fans

https://www.wsj.com/world/asia/this-futuristic-japanese-warship-is-on-the-market-and-winning-fans...
2•JumpCrisscross•12m ago•0 comments

Bill that would mandate AI chip location tracking gains industry support

https://www.nbcnews.com/tech/tech-news/chips-security-act-gains-industry-support-letter-rcna350500
3•elliotbnvl•19m ago•0 comments

Welcome to America, World Cup visitors. Don't forget to tip

https://www.axios.com/2026/06/21/world-cup-service-fees-tipping-culture
3•rguiscard•22m ago•0 comments

The Wheel of Life

https://dsernst.com/writing/2026/wheel-of-life
1•dsernst•22m ago•0 comments

Good results fine tuning a local LLM like Qwen 3:0.6B to categorize questions

https://www.teachmecoolstuff.com/viewarticle/fine-tuning-a-local-llm-to-categorize-questions
2•dev-experiments•27m ago•0 comments

The Revolution Will Not Be Digitized

https://lareviewofbooks.org/article/social-codes-tech-workers-class-identity-digital-capitalism/
1•colinb•28m ago•0 comments

Simple hard way to conjugate Japanese verbs

https://underreacted.leaflet.pub/3mmevu6woys27
3•valzevul•28m ago•1 comments

Show HN: Real-Life Deception Detection Without Uploading Video

https://github.com/WhissleAI/lie_detection_binary
1•ksingla025•31m ago•0 comments

Evaluating sugar-sweetened beverage tax effects

https://pmc.ncbi.nlm.nih.gov/articles/PMC12669988/
1•luu•34m ago•0 comments

I Canceled My French Tutor and Built an LLM Tool That Does It Better

https://alshe.substack.com/p/i-canceled-my-french-tutor-and-built
2•Anon84•35m ago•0 comments

PebbleOS

https://github.com/coredevices/PebbleOS
1•arbayi•36m ago•0 comments

Robust Jobserver

https://codeberg.org/mlugg/robust-jobserver/src/branch/main/spec.md
1•birdculture•38m ago•0 comments

The Deadly Rise of Giant Trucks and S.U.V.s

https://www.nytimes.com/interactive/2026/06/21/us/trucks-suv-pedestrian-crashes.html
8•xnx•40m ago•1 comments

Migrating from Claude to DeepSeek without breaking everything

https://blog.firetiger.com/migrating-from-claude-to-deepseek-without-breaking-everything/
2•eric_khun•41m ago•0 comments

Compass – guardrails and a hard budget cap for AI coding agents

https://github.com/dshakes/compass
1•chandu1221•43m ago•0 comments

The Crusade of Hormuz

https://www.historytoday.com/archive/history-matters/crusade-hormuz
2•Thevet•49m ago•0 comments

Real-Time GPS Tracking Station

https://www.gps-satellites.com/
1•gnabgib•52m ago•0 comments

Show HN: Fold-logging.nvim – fold logging and debug-print statements in Neovim

https://github.com/markosnarinian/fold-logging.nvim
1•markosn•52m ago•0 comments

Swift, Gay and Pope's season in the sun

https://www.theguardian.com/books/2026/jun/12/the-twitnam-summer-by-hester-grant-review-swift-gay...
1•Petiver•1h ago•0 comments