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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•10mo 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!

Predicting home electricity usage from historical patterns in Home Assistant

https://blog.cyplo.dev/posts/2026/03/load-prediction-in-home-assistant/
1•swq115•58s ago•0 comments

I made a GPU price tracker

https://gpusniper.com/
1•codingblink•3m ago•1 comments

HopTab–free,open source macOS app switcher and tiler that replaces Cmd+Tab

https://www.royalbhati.com/hoptab
1•robhati•5m ago•0 comments

We built Avancé Communicatie (digital services for Dutch companies)

https://www.avancecommunicatie.nl/
2•bullmeister•10m ago•0 comments

Why do we need apps like cursor?

1•amanhij•11m ago•0 comments

Ask HN: Top repos you'd want offline on a desert island?

1•quijoteuniv•12m ago•0 comments

Computer Networks: A Systems Approach

https://open-cloud.github.io/index.html
1•vismit2000•18m ago•0 comments

Kattis Problem Archive

https://open.kattis.com
1•vismit2000•20m ago•0 comments

Show HN: Helios – 3 Claude agents (Red vs. Blue) hack and patch your codebase

https://gitlab.com/nakaiwilliams20/helios
2•nakaiwilliams•21m ago•0 comments

Synaphe – A type-safe language for hybrid AI and quantum computing

https://github.com/martus-spinther/synaphe-project
2•martus-spinther•30m ago•0 comments

Mindwtr – Open-source, local-first GTD app (Tauri and React Native)

https://github.com/dongdongbh/Mindwtr
1•dongdongbh•31m ago•0 comments

Quantum mechanics simulation Python library for research and learning

https://github.com/iDEA-org/iDEA
1•jw1294•33m ago•1 comments

Proof Theory and Logic Programming

https://www.lix.polytechnique.fr/Labo/Dale.Miller/ptlp/
1•remywang•34m ago•0 comments

Tell HN: Microsoft365 "Convert to Paid" checkout silently default to 25 licenses

2•davidstarkjava•37m ago•1 comments

Show HN: Passport Globe (See where your passport takes you)

https://hariharan.uno/globe
1•hariharan_uno•46m ago•0 comments

Show HN: TMA1 – Local-first observability for LLM agents

https://tma1.ai/
2•killme2008•47m ago•0 comments

Show HN: Yeet – Throw AI tasks at hardware and walk away (Nomad and OpenShell)

https://github.com/wan0net/yeet
1•wan0net•48m ago•0 comments

Phase Transitions and Computation

https://theory.org/complexity/cdpt/html/node5.html
1•downboots•52m ago•0 comments

Show HN: Banish: A declarative framework for rule-based state machines in Rust

https://github.com/LoganFlaherty/banish/releases/tag/v1.3.0
1•LoganFlaherty•52m ago•0 comments

Bitcoin mining difficulty drops 7.8% as miner exodus accelerates amid AI pivot

https://www.theblock.co/post/394579/bitcoin-mining-difficulty-drops-7-8-as-miner-exodus-accelerat...
3•adrianwaj•52m ago•1 comments

Review: Why Evolution Is True

https://ncse.ngo/review-why-evolution-true
2•akbarnama•56m ago•0 comments

We Read What Delve Ships to the Browser

https://security.redeux.ai/research/delve-compliance-posture
1•chasewarren•1h ago•0 comments

Isometric exercise: The most efficient fitness regime?

https://www.bbc.com/future/article/20260319-isometric-exercise-the-most-efficient-fitness-regime
2•akbarnama•1h ago•0 comments

A Rant about Resolutions

https://blog.brixit.nl/rant-about-resolutions/
1•vinhnx•1h ago•0 comments

Is Simple Good?

https://darth.games/posts/is-simple-good/
1•vinhnx•1h ago•0 comments

Delve Accused of Fraud

https://techcrunch.com/2026/03/21/delve-accused-of-misleading-customers-with-fake-compliance/
5•zlu•1h ago•0 comments

Sashiko: AI code review system for the Linux kernel spots bugs humans miss

https://www.theregister.com/2026/03/20/sashiko_code_review_linux/
2•maxloh•1h ago•0 comments

AI Disrupts Talent Evaluation Before It Disrupts Talent

https://substack.com/home/post/p-191732116
2•cactaceae•1h ago•0 comments

A Reason to Ditch Jira: AI Agents

https://age-of-product.com/jira-ai-agents/
1•swolpers•1h ago•0 comments

Show HN:Entroly – Compress codebase context for LLMs by 78% using Rust

https://github.com/juyterman1000/entroly
1•savetokens•1h ago•0 comments