Monocle Studio · Free

Now, what about
localhost?

Monocle Studio shows what your app does while you code: every request, query, log, and exception, live on localhost. Your app uses the same agent as in production, nothing to change.

Download the app Read the docs

Real time

New data appears instantly

Queries & calls

SQL and external APIs

MCP & CLI

For your coding agent

CLI or desktop

macOS, Linux, Windows

One command, no config

In development, the agent sends telemetry to Studio instead of the cloud. Studio stores it locally and serves the dashboard and the OTLP endpoint on one port.

The generated config/monocle.ts already turns dev mode on during node ace serve
Data stays on your machine and persists between restarts
Prefer a native app? The desktop app lives in the tray and updates itself

terminal

npm install -D @monocle.sh/studio @monocle.sh/cli

# Start Studio on http://localhost:4200
npx monocle studio dev

# Then run your app as usual
node ace serve --hmr

Your backend, like browser DevTools

Every request comes with its full span waterfall. See the queries it ran, the APIs it called, and the logs it wrote, as soon as you hit save and reload.

Spot slow queries before they reach production
Outgoing HTTP calls with their domain, status, and duration
Background jobs and Ace commands traced like requests

Give your coding agent eyes on your app

Studio runs an MCP server and ships a CLI, so Claude Code, Cursor, or Codex can read your local traces, logs, and errors on their own instead of you pasting them.

Add the MCP server in one command, for 15+ clients
Query traces, logs, and errors from the terminal, as JSON if needed
install-agents adds a Studio section to your AGENTS.md or CLAUDE.md

terminal

# Connect your coding agent to Studio
pnpm dlx add-mcp http://localhost:4200/mcp -n monocle-studio -a claude-code

# Or let it use the CLI
monocle studio errors
monocle studio traces --service my-api --format json

# Teach your agents about Studio
monocle studio install-agents

Works with

Plugs into your stack

macOS

Apple Silicon and Intel

Linux

AppImage (x64)

Windows

Installer (x64)

Claude Code

Studio MCP and CLI

Cursor

Studio MCP

Codex

Studio MCP and CLI

Next up

Follow every request, span by span.

Every HTTP request, background job, and Ace command becomes a trace, even when it crosses services. Logs and metrics land right next to it, already connected. Nothing to wire by hand.

Explore Traces, logs & metrics

Read the docs

All features

Early access

See what your apps
are really doing.

Traces, logs, errors and metrics for every app you ship. Bring it all into focus.

Get started Read the docs

Now, what aboutlocalhost?