co2-tracker vs CDT Express by Riskthinking.AI
co2-tracker is a plugin bundle for AI coding tools published by gwittebolle. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). CDT Express by Riskthinking.AI is an MCP server published by RiskThinking. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-29. 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 |  co2-tracker |  CDT Express by Riskthinking.AI |
|---|---|---|
| Claude Code: claude-plugins-community | Listed Version: 1.1.2 Forks (GitHub): 19 Stars (GitHub): 229 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.7.0 Forks (GitHub): 0 Stars (GitHub): 1 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 | co2-tracker | CDT Express by Riskthinking.AI |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 229 (better) | 1 (worse) |
| Forks (GitHub) (differs) | 19 (better) | 0 (worse) |
| Last release (differs) | Not published | 2026-10-27 |
| Where it runs (differs) | Installs as a plugin bundle | Remote server (mcp.riskthinking.ai/mcp) |
| Transport (differs) | Not stated | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Hooks it runs (differs) | 2 | Not published |
| Parts of the bundle (differs) | 5 | Not a bundle |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/gwittebolle/claude-carbon | github.com/riskthinking/cdt-express-mcp |
| Changes in the last 7 days (differs) | 0 | 2 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | no remote endpoint we check | Responded 11 h ago, requires a key |
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
co2-tracker
Track the carbon footprint of your Claude Code sessions. Adds a live CO2 estimate to the status line, persists sessions to a local SQLite database, and generates shareable PNG report cards. Based on peer-reviewed emission factors from Jegham et al. 2025.
CDT Express by Riskthinking.AI
Interact with climate metrics via Riskthinking.AI's CDT Express API in supported AI chat experiences
How to run each
co2-tracker As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install co2-tracker@claude-communityCDT Express by Riskthinking.AI As a remote MCP server
claude mcp add --transport http cdt-express-mcp https://mcp.riskthinking.ai/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only CDT Express by Riskthinking.AI has a remote endpoint we check. How we check endpoints
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: co2-tracker · What it can do: CDT Express by Riskthinking.AI · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/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.