Best Products Built with JavaScript (Free) in 2026
19 free javascript products, ranked by community upvotes.
CodeBurn
Local, free CLI to track AI coding token usage and cost across tools and agents
butterfly css
Attribute-based CSS framework for responsive, animated websites via CDN.
Controller Tester Online
Browser-based gamepad diagnostics with drift, deadzone, vibration tests and exportable reports.
Calculators Solutions
Free responsive online calculator for basic arithmetic with history and exports
FlowPick
Privacy-first browser extension to detect and download HLS/DASH, video, audio & images.
VPN Leak Test
Instantly check for IP, DNS, WebRTC, and IPv6 leaks—one-click VPN test.
PdfCompare
Compare PDFs locally in-browser with 100% client-side privacy
Cicada
Minimal circular progress/percentage UI demo built with HTML/CSS/JS
neo Rename
AI-powered batch media renamer for WordPress to improve image SEO using your own AI API.
OverflowGuard
Prevent layout breakage by designing around content, not fixed breakpoints.
Read in Romaji
Adds romaji readings to Japanese webpages locally in your browser.
midi editor
Browser MIDI editor: piano roll, tempo/time signature, SoundFont, WAV/MP3 export
Shipcheck
Local CLI that scans JS/TS and MCP repos for launch risks and sensitive metadata.
Private Toolkit
Convert images, video and text in-browser — nothing is uploaded.
Subreddit Gallery Viewer
View any subreddit as a customizable image gallery with instant downloads
Zero Keep
Private AI workspace that runs entirely in your browser — no cloud, no accounts.
GotchaCrew
Free 'Most Likely To' party game — one phone, secret votes, big reveals
Polychrome Computer
Sing a melody, detect the key, and get eight real chord voicings instantly.
Kelec Bill Online
Free HTML5 browser games — play instantly, no download or sign-up.