RunJS
Redefine any site with your own CSS & JS
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This is 1 of 253 launches in developer frameworks and SaaS starter kits — see how it stacks up on momentum and crowding →
124 other launches read as similar to this one →
Details
- External ID
- 1273523
- Source
- PH
- Company
- —
- Product
- RunJS
- Website domain
- producthunt.com
- Launched
- Oct. 9, 2026
- Cohort
- —
- Upvotes
- 1
- Upvotes percentile
- 0.33
- Tags
- Chrome Extensions, Productivity, Developer Tools
Description
RunJS binds a target URL to optional CSS/JS you write. One click opens the page (redirects followed for that run) and injects after it lands. Local-first by default—no ads, no tracking, no remote script fetch. Optional Google Drive sync keeps your library in your Drive app data. Popup + Dashboard, Match patterns, import/export, 18 languages.
Enrichment
- Niche
- developer frameworks and SaaS starter kits
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- custom code injector for web pages
- Manually corrected
- False
Could you build this?
Yes This is a straightforward browser extension (like Tampermonkey/UserCSS) that injects user-defined CSS and JavaScript into specific matched URLs, with optional cloud storage sync via Google Drive API.
Competitors
Other products that read as similar to this one — 124 launches clear the similarity bar, closest 8 shown.
Attention rank: #63 of 125 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 319 days after the earliest competitor.
- SDS - Start Dev Server · ph · 2026-09-06 · 2 upvotes · similarity 0.47
- mydevstack · ph · 2026-09-24 · 1 upvotes · similarity 0.45
- RunHTML - preview and share html page · ph · 2026-09-14 · 1 upvotes · similarity 0.45
- Launchpad · ph · 2026-09-15 · 1 upvotes · similarity 0.43
- > Root.Run · ph · 2026-10-05 · 1 upvotes · similarity 0.43
- Next.js 15 Directory Boilerplate · ph · 2026-09-23 · 4 upvotes · similarity 0.42
- Drible · ph · 2026-10-06 · 2 upvotes · similarity 0.39
- runto.page · ph · 2026-09-15 · 2 upvotes · similarity 0.39
Other launches for this product
- No other launches for this product.