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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!

"Piss Christ" Became a Culture-War Bomb

https://www.newyorker.com/magazine/2026/07/20/the-perfect-moment-isaac-butler-book-review
1•tintinnabula•27s ago•0 comments

Online vs. Offline AI Evals: When to Use Each

https://www.inngest.com/blog/online-vs-offline-ai-evals-when-to-use-each
1•aldersondev•2m ago•1 comments

US Census Population by County 1790 – 2020

https://app.honeycombmaps.com/shared/8VERAg0CP2LFMy4dMcG_jV_bgKC7mPQ8
1•gmays•3m ago•0 comments

Show HN: Pupul, portable and revocable memory you carry into any AI

https://pupulcorp.com/revoke-demo
1•coleaalkire•6m ago•0 comments

Wtdev – deterministic dev-server ports for parallel Git worktrees

https://github.com/Dave-56/wtdev
1•pemakenemi56•7m ago•0 comments

Performing Live Migrations of VMs

https://www.sailresearch.com/blog/performing-live-migrations-of-massive-vms-at-scale
2•blintz•8m ago•0 comments

Change-Stack.com – Database and newsletter for opportunities to change the world

https://www.change-stack.com/
1•mikeymikemik•8m ago•1 comments

House passes bill to make Daylight Saving Time permanent

https://www.cnn.com/2026/07/14/politics/house-vote-daylight-savings-time
2•pseudolus•11m ago•0 comments

"You don't need a storefront's permission to play what you bought."

https://xcancel.com/GOGcom/status/2077037131751432515
1•HelloUsername•12m ago•0 comments

Microsoft Deletes User's 25-Year-Old Account with Thousands Spent on Games

https://xcancel.com/JoshuaKhane/status/2076918699248803977
3•HelloUsername•14m ago•2 comments

Open Source AI Rebel Alliance

https://time.com/article/2026/07/13/open-source-ai-mozilla-rebel-alliance/
1•Flere-Imsaho•14m ago•0 comments

Design Systems as Knowledge Graphs

https://chsmc.org/2021/08/systems-as-knowledge-graphs/
1•thunderbong•14m ago•0 comments

Unsung's Cursed Knowledge

https://unsung.aresluna.org/cursed-knowledge/
1•frizlab•15m ago•0 comments

Microsoft Patches a Record 570 Security Flaws

https://krebsonsecurity.com/2026/07/microsoft-patches-a-record-570-security-flaws/
3•robin_reala•17m ago•0 comments

Vaultwarden Personal Vault $10

1•swaggermann•18m ago•0 comments

Show HN: Voidfall – Space looter shooter in the browser

https://github.com/nickyvanurk/voidfall
2•nickyvanurk•19m ago•0 comments

AppleUnsold

https://appleunsold.com
1•gregsadetsky•19m ago•1 comments

Cyberstalkers Are Exploiting Chrome Sync to Spy on Victims

https://www.certosoftware.com/insights/cyberstalkers-exploiting-chrome-sync-to-spy/
1•hn_acker•20m ago•0 comments

Making a Mechanical Light Bulb [video]

https://www.youtube.com/watch?v=0Y-9GbsS9Fg
1•kadohg•23m ago•0 comments

CNN duped by parody account on Twitter posing as California politician

https://www.sfgate.com/politics/article/mcconnell-viral-parody-cnn-22343474.php
2•ilamont•28m ago•0 comments

'This looks rubbish': Palantir and the NHS

https://www.lrb.co.uk/the-paper/v48/n13/peter-geoghegan-and-lucas-amin/this-looks-absolutely-rubbish
3•specproc•29m ago•0 comments

Privacy-First PDF Tools

https://cleanvault.github.io/
1•audit-mate•32m ago•1 comments

Book Corners

https://www.bookcorners.org/
2•bookofjoe•34m ago•0 comments

Dependabot version updates introduce default package cooldown

https://github.blog/changelog/2026-07-14-dependabot-version-updates-introduce-default-package-coo...
3•woodruffw•34m ago•0 comments

Tkrzw: Tokyo/Kyoto Cabinet Successor

https://dbmx.net/tkrzw/
1•godisdad•34m ago•1 comments

Rad: The relational database, redesigned. OLTP backed by durable object storage

https://www.radengine.dev
2•jerlendds•40m ago•1 comments

Castle building for beginners: marketing yourself

https://bitfieldconsulting.com/posts/castle-building
1•dxs•41m ago•0 comments

After wearing the Pebble Time 2 for two weeks, I'll never buy another smartwatch

https://www.androidauthority.com/pebble-time-2-smartwatch-hands-on-3680077/
6•jethronethro•43m ago•0 comments

Same model, same Q4_K_M label: 5.02, 5.07 and 5.27 bits per weight

https://github.com/logxio/picchio
6•logickkk1•43m ago•0 comments

Algorithmic Composition as a Web Shop

https://monictheory.com
1•song_synth•46m ago•0 comments