notesfilter.com

What It Is

NotesFilter is a free browser extension from Wildfront designed to clean up the Substack Notes feed. Its core purpose is straightforward: after users add keywords or phrases they do not want to see, the extension automatically hides matching Notes while browsing Substack Notes pages, helping users focus on more relevant content. The page states that it supports Chrome and Firefox, and that no account registration is required.

Core Features and User Experience

The product uses a very lightweight keyword-filtering approach: after installing the extension, users enter multiple keywords in the panel, separate them with commas, and save. Matching is case-insensitive substring matching, and the page also notes that keeping keywords short can produce broader filtering results. Filtering is applied automatically on Substack Notes pages being visited, with no page refresh required. Management options include adding, deleting, or pausing keywords. Overall, the interaction model is extremely minimal: open it, type, and save.

Pricing, Security, and Deployment

In terms of pricing, the page clearly describes it as a Free browser extension. It is free to use and requires no account, so there is no payment barrier, and no paid plans are disclosed. On privacy, NotesFilter emphasizes that all filtering happens locally and that keywords never leave the browser, which is friendly for users who only need personal feed cleanup. Its deployment model is essentially a browser extension rather than a traditional SaaS dashboard; the page does not provide information about cloud management, self-hosting, compliance certifications, APIs, or developer support.

Pros and Cons

Its advantages are that it is free, lightweight, quick to get started with, and usable without an account. Local processing reduces concerns about keywords being transmitted externally. Support for both Chrome and Firefox also gives it reasonable coverage. The downsides are equally clear: it is limited to Substack Notes, so the use case is very narrow; its rule capabilities stop at keywords and phrases, with no visible support for whitelists, author-based filtering, regex, sync, multi-device configuration, or team permissions. There is also limited information about support, updates, and ongoing maintenance.

Who It’s For and Access from China

NotesFilter is best suited for individual users who frequently use Substack Notes and want to block noise around specific topics, such as creators, investors, or SaaS professionals. It is not suitable for organizations that need enterprise-grade auditing, unified policies, team collaboration, or cross-platform content governance. Regarding access from China, the collected text does not provide availability information. Since its use depends on Substack and browser extension store environments, actual access, installation, and payment conditions may be affected by network conditions. Domestic alternatives could include general-purpose content filtering extensions, userscript managers, or feed clients with keyword blocking features.