Run custom JavaScript, each time you visit a website/domain

Run custom JavaScript, each time you visit a website/domain launched on September 21, 2018 with 5 votes, #1,209 of 2,635 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 8 years on.

Visit chrome.google.com ↗Alternatives

Does a similar job

all alternatives →

Pomerado10d ago · pomerado.ai · ▲179
Turn any website into an API / MCP in minutes
ES
Execute, share, and rate arbitrary JavaScript in-browser2015 · riskyclicks.click · ▲5
OE
Optimize existing websites automatically with just a click2014 · snapmobl.com · ▲7
RB
Reusing browser JavaScript code on server2012 · blog.elastic.io · ▲7
PM
Practical Modern JavaScript2017 · ponyfoo.com · ▲7
Offline JS PlaygroundAug 2026 · chromewebstore.google.com · ▲98
Write, run, and test JavaScript snippets & JSON offline

More life & fun this month

the category →

SimCity, but with Permits▲905
A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.
Life & fun · 1d ago · permit.petercai.com
IV
I've been paying for a rural Tanzanian's education for 10 years▲778
Life & fun · 13d ago · tanzaniaeducationproject.org
Bigwords.page – Turn any screen into a sign. The URL is the app▲728
Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.
Life & fun · 14d ago · bigwords.page
Guitoro, a virtual guitar you strum with your keyboard▲573
Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.
Life & fun · 8d ago · guitoro.com
See *almost* any carriers phone settings▲432
Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.
Life & fun · 12d ago · carrierexplode.com
The whole Solar System and every tracked satellite, live in the browser▲407
Life & fun · 22d ago · space.bl2.net

Source: Show HN post ↗

Launched alongside, September 2018

the whole month →

IM
I made a privacy-first minimalist Google Analytics▲968
Life & fun · 2018 · simpleanalytics.io
Sublime Merge – A Git client from the makers of Sublime Text▲935
Discover a powerful Git GUI Client for Mac, Windows and Linux, from the makers of Sublime Text. Line-by-line Staging. Commit Editing. Unmatched Performance.
Life & fun · 2018 · sublimemerge.com
Zendesk for Startups▲921
Every customer counts when you're a startup
Growth · 2018 · zendesk.com
SS
Select Star SQL, an interactive SQL book▲700
Dev tools · 2018 · selectstarsql.com
Lunar lander-type game with computational fluid dynamics▲660
Lunar lander type game with computational fluid dynamics - s-macke/Interplanetary-Postal-Service
Life & fun · 2018 · github.com
Ship 2.0▲651
A toolkit to ship awesome products, by Product Hunt ⛵️
Growth · 2018

LaunchedSep 21, 2018

Launch day▲ 5 votes, 1 commentstop 46% of 2,635 that month

Websitechrome.google.comonline, checked September 2026

CategoryLife & fun

Brought here0 visitors via the maker’s link

Is this your product, or is something wrong here? Suggest a correction.

By the numbers

#1,209
of 2,635 launches in September 2018: 50%
of 2018's launches got fewer votes: 83
launches landed the same day: 10%
of launches posted at 12:00 UTC reach 10 votes: 8 yrs
on, the site is still online (checked September 2026)

Show this on your site

A badge that reads online since 2018 and keeps itself current. Paste it anywhere HTML goes; it links back to this page.

<a href="https://nowfound.app/launch/run-custom-javascript-each-time-you-visit-a-website-domain"><img src="https://nowfound.app/badge/run-custom-javascript-each-time-you-visit-a-website-domain.svg" alt="Run custom JavaScript, each time you visit a website/domain on NowFound" height="32"></a>

Other versions: listed

Built something too?

Add it in two minutes. You get a page like this, a share link that counts visitors, and a badge.

Add product