PDF Viewer vs Apdf — PDF Tracking & Analytics
PDF Viewer is a plugin bundle for AI coding tools published by Anthropic. Marketplaces we read that list it: 1 (Claude: knowledge-work-plugins). Apdf — PDF Tracking & Analytics is an MCP server published by apdf.io. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-14. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Apdf — PDF Tracking & Analytics | |
|---|---|---|
| Claude: knowledge-work-plugins | Listed Version: 0.2.0 Forks (GitHub): 3 361 Stars (GitHub): 29 647 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 1.1.1 No figure published Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | PDF Viewer | Apdf — PDF Tracking & Analytics |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 29 647 | No figure on GitHub |
| Forks (GitHub) (differs) | 3 361 | No figure on GitHub |
| Last release | Not published | Not published |
| Where it runs (differs) | On your machine (@modelcontextprotocol/server-pdf) | Remote server (apdf.io/mcp/main) |
| Transport (differs) | Not stated | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 6 | Not a bundle |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/anthropics/knowledge-work-plugins | Not stated |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | no remote endpoint we check | not checked yet |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
PDF Viewer
View, annotate, and sign PDFs in a live interactive viewer. Mark up contracts, fill forms with visual feedback, stamp approvals, and place signatures — then download the annotated copy.
Apdf — PDF Tracking & Analytics
PDF engagement layer for apps and agents: tracking links, read analytics, and a full PDF toolset.
How to run each
PDF Viewer As a Claude Code plugin
/plugin marketplace add anthropics/knowledge-work-plugins
/plugin install pdf-viewer@knowledge-work-pluginsApdf — PDF Tracking & Analytics As a remote MCP server
claude mcp add --transport http apdf-pdf-tracking-analytics https://apdf.io/mcp/mainCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: PDF Viewer · What it can do: Apdf — PDF Tracking & Analytics · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/knowledge-work-plugins/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.