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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!

Amsterdam activists throw acid at Microsoft datacenter project

https://www.theregister.com/ai-and-ml/2026/07/16/amsterdam-activists-throw-acid-at-microsoft-data...
1•vrganj•37s ago•0 comments

Show HN: Run all your sites SEO on autopilot (boldpilot.club)

https://boldpilot.club
1•Utopyasz•48s ago•0 comments

Show HN: A pi extension that adds a /for prompt-loop with $each insertion

https://pi.dev/packages/pi-for-each
1•jejay•1m ago•0 comments

MSE-GLM – A Deterministic Zero-Weight Graph Language Model

https://github.com/fodokidza/mse_glm
1•clifffodokidza•1m ago•0 comments

Obsidian stores notes privately on your device

https://obsidian.md/
1•doener•4m ago•0 comments

Show HN: The Hanoi Tree

https://avl-games.com/
1•berardino•5m ago•1 comments

Trump pushes UN 'free speech' declaration in veiled attack on EU tech regulation

https://www.politico.eu/article/trump-administration-will-push-un-free-speech-declaration-that-ta...
2•thm•8m ago•0 comments

Make every row and column a group of three

https://sixfold.pwheslop.com
1•michaelbrooks•10m ago•1 comments

Java was a three-day hotfix away from dying horribly on stage

https://www.theregister.com/devops/2026/07/18/java-was-a-three-day-hotfix-away-from-dying-horribl...
1•beardyw•11m ago•0 comments

Write with Maximum Effort

https://petegleeson.com/blog/write-with-maximum-effort/
2•petegleeson•19m ago•0 comments

GEMM Performance Measurement Methodology Guidelines

https://docs.nvidia.com/cutlass/latest/media/docs/cpp/gemm_performance_measurement_methodology_gu...
1•matt_d•22m ago•0 comments

Faster Algorithms for Structured Matrix Multiplication via Flip Graph Search

https://dl.acm.org/doi/10.1145/3815436.3815455
1•matt_d•24m ago•0 comments

International Math Olympiad 2026 Results

https://www.imo2026.com/Results/Individual_Results.htm
1•pykello•25m ago•0 comments

I'm Done with Mullvad

https://moonwriting.blog/i-m-done-with-mullvad
3•lylo•29m ago•0 comments

Vibecoded Scheme Implementation

https://kaappi-lang.org/
1•baijum•30m ago•0 comments

Nolan's Odyssey – A technical analysis by a nitpicky Classics student

https://earlrambles.pagecord.com/nolans-odyssey-a-very-technical-analysis-by-a-very-nitpicky-clas...
2•lylo•30m ago•0 comments

Show HN: Fluxnation, the Fastest FLUX.1 Execution Kernel

https://github.com/ULT7RA/FLUXNATION
1•KnoxProtocol•32m ago•0 comments

Taking OCaml and Eio for a Spin

https://mattjhall.co.uk/posts/taking-ocaml-eio-for-a-spin.html
1•mattjhall•34m ago•0 comments

The Java Story | Official Documentary

https://www.youtube.com/watch?v=ZqGSg4b_cZA
2•doppp•34m ago•0 comments

Distro Fighter – web browser game

https://distrofighter.com/
1•ashitlerferad•35m ago•0 comments

Swedbank fined $50M by New York authorities over Panama Papers revelations

https://www.icij.org/investigations/panama-papers/swedbank-fined-50-million-by-new-york-authoriti...
1•robtherobber•37m ago•0 comments

Show HN: Tool to help old Java projects not on modern build systems

https://maven-tools.mohants.com/
1•pmg1991•38m ago•0 comments

Show HN: GeoChess – open-source geography strategy game

https://geochess.org
2•spider-hand•39m ago•1 comments

How much of your workweek goes the way you expected? [pdf]

https://www.microsoft.com/en-us/research/wp-content/uploads/2024/11/Time-Warp-Developer-Productiv...
1•akarshhegde18•40m ago•0 comments

The M5Stack Tab5

https://taoofmac.com/space/reviews/2026/07/18/1920
1•rcarmo•45m ago•0 comments

Ask HN: Are there any new competitors to Google search in 2026?

2•roschdal•52m ago•2 comments

EU Exempts Apple Watch and AirPods from Battery Removal Requirements

https://mjtsai.com/blog/2026/07/17/eu-exempts-apple-watch-and-airpods-from-battery-removal-requir...
6•miohtama•57m ago•2 comments

AI Watermark Evidence Fails Forensic Readiness: An Empirical Evaluation

https://arxiv.org/abs/2607.16010
1•sbulaev•1h ago•0 comments

A Lunch Conversation Changed My Website

https://ammar-najjar.com/blog/rebuilding-website-astro/
1•ammarnajjar•1h ago•0 comments

Is there even a ground-truth for LLMs' internal representations?

https://www.lesswrong.com/posts/EetjXEwjR2eun2mAc/is-there-even-a-ground-truth-for-llms-internal
2•joozio•1h ago•0 comments