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Use it anywhere

Use the tools where you build.

If you ship on the Claude API, the Workbench tools — exact token counts, per-call and cross-provider cost math, prompt cost audits, caching analysis — work wherever you do: inside Claude, in your browser, or embedded on your own product. Free, no API key, nothing to maintain.

01 · Inside Claude

Run the tools mid-conversation

Add one connector and Claude can call the tools while you work — count tokens, price a call across providers, audit a prompt — without leaving the chat. Works in claude.ai and Cowork. The tools return the exact numbers Claude can't compute itself; for anything generative, Claude does that directly.

Connector URL

https://turntwo.dev/api/mcp
  1. 1In Claude.ai, open Settings → Connectors (Team/Enterprise: Organization settings → Connectors).
  2. 2Click "Add custom connector".
  3. 3Paste the URL above and save — no API key or sign-in required.
  4. 4Ask, e.g., "audit this prompt" or "what would this cost on Sonnet vs Opus?" — Claude calls the tool.

Full tool list + reference →

TRY IT — this calls the real server

Run a tool to see what Claude would receive.

02 · On your site

Drop a tool on your own product

The browser-based tools embed with one line of HTML — they run entirely in your visitor's browser, so there's no account, no API key, and nothing to maintain. Here's one running live:

Paste this anywhere

<iframe src="https://turntwo.dev/embed/tools/meeting-cost-clock"
  width="100%" height="540"
  style="border:1px solid #ccc;border-radius:12px;max-width:560px"
  loading="lazy"></iframe>

Every embeddable tool has its own copy-paste snippet on its page.

Browse embeddable tools →

03 · Browser panel

Developer preview

A side panel next to claude.ai

A Chrome/Edge side panel for the tools while you work in any tab. It's a thin client over the same server as the connector — free, no key. It's a developer preview for now (load it unpacked); a one-click Chrome Web Store install is coming.

  1. 1Download the extension folder (or clone the repo) and open chrome://extensions.
  2. 2Turn on Developer mode (top-right).
  3. 3Click "Load unpacked" and select the extension/ folder.
  4. 4Pin it and click the icon — the panel opens beside any tab, including claude.ai.

04 · Practice

Live

Get genuinely good at Claude — hands-on

A self-serve trainer that turns non-technical people into confident, skilled Claude users — short drills across prompting, authoring skills, and building agents that you work through at your own pace. You write the answer; your own Claude grades it (nothing spends your tokens but you). Where Signal tells you what's new, Practice builds the skill. Add the same drills inside Claude.ai and Cowork via the connector above, so practice lives right where you already work.

Open Practice →30 drills · free · no signup