Compare: JShelter vs OptMeowt

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Metric	JShelter	OptMeowt
User count	10,000	5,000
Average rating	4.50	4.00
Rating count	34	7
Last updated	2026-07-04	2026-06-07
Size	0.54 MB	3.68 MB
Version	0.24.1	6.2.0

Short description	Protect your browser from fingerprinting and malicious JavaScript. JShelter controls and restricts browser APIs to reduce tracking and data leaks.	OptMeowt helps web users exercise their right to opt out of personal data sales by automating Global Privacy Control signals on websites.
Full summary	JShelter is a browser extension that returns control over JavaScript-driven behavior to the user. Acting like a firewall for browser APIs, it lets you allow, block, or restrict access to sensitive browser capabilities to prevent fingerprinting, tracking, and unwanted data leakage. JShelter can also reduce precision for features like geolocation and apply safeguards against attacks targeting the browser, OS, or hardware. Beyond blocking, JShelter helps you learn how pages call JavaScript APIs with its Fingerprint Detector and exportable JSON reports. The project provides documentation, a threat model, and a research paper for deeper understanding (see the FAQ and blog on jshelter.org and the arXiv paper). Use JShelter to harden your browsing privacy and security while retaining per-site control over what web pages can access.	OptMeowt is a Chrome extension designed to empower web users by automating their privacy preferences in compliance with regulations like the California Consumer Privacy Act (CCPA). It sends Global Privacy Control (GPC) signals to websites, signaling users' choices to opt out from the sale and sharing of their personal data. This extension respects user privacy by not collecting or sharing any personal data itself. Users can learn more about Global Privacy Control or access OptMeowt's open-source code on GitHub. For any issues, helpful FAQs and support are available, making OptMeowt a reliable tool for enhancing online privacy with minimal effort.