Keyframer Inspector

Name: Keyframer Inspector
Author: keyframer-dev

by keyframer-devversion 0.4.0i★ –iRuns on your computer

Registry namedev.keyframer/inspector

Install

Overview

Description from the maker (original English)

Give your agent eyes for motion: record, slow down and test animations in mobile apps

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: KEYFRAMER_VITALS_READ_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: KEYFRAMER_VITALS_READ_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "inspector": {
      "command": "npx",
      "args": [
        "-y",
        "@keyframerdev/inspector",
        "mcp"
      ],
      "env": {
        "KEYFRAMER_VITALS_READ_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add inspector --env KEYFRAMER_VITALS_READ_KEY=your-value -- npx -y @keyframerdev/inspector mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "inspector": {
      "command": "npx",
      "args": [
        "-y",
        "@keyframerdev/inspector",
        "mcp"
      ],
      "env": {
        "KEYFRAMER_VITALS_READ_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "inspector": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@keyframerdev/inspector",
        "mcp"
      ],
      "env": {
        "KEYFRAMER_VITALS_READ_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

KEYFRAMER_VITALS_READ_KEY secret env
Optional: a Motion Vitals workspace read key (kfw_...) for field_problems and field_compare. Every other tool works without it.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain keyframer.dev (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32558 servers in this category
Published to the registry more recently than 72% of the other 32558 servers in this category
Basic checks equal to or better than 100% of the other 32558 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Keyframer Inspector safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: KEYFRAMER_VITALS_READ_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.4.0) reached the registry 14 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, FactLot

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Keyframer Inspector

A motion debugger for apps. Every animation, with the line of code that started it, what it cost, and why frames dropped, recorded on the device and scrubbed like a video. Tune a duration or a spring and write the numbers back to your source. Hand the recording to a coding agent over MCP, or gate pull requests on it in CI.

https://github.com/user-attachments/assets/81d909d3-64fb-431b-a06f-1d20da5d5952

This repository holds the SDKs that go into your app, for every platform, under MIT.

Platform	Folder	Install
React Native (Reanimated)	`react-native/`	`npm i -D @keyframerdev/inspector`
iOS (UIKit)	`ios/`	Swift Package Manager: `https://github.com/keyframer-dev/inspector`
Android (Views)	`android/`	`debugImplementation("dev.keyframer:keyframer-inspector: ")`
Flutter	`flutter/`	`flutter pub add keyframer_inspector`

The apps connect to Keyframer Inspector, the desktop app (below). React Native apps can also use the panel inside Expo's dev tools, no desktop app needed.

Quick start

React Native. Add the Babel plugin in development (before react-native-worklets/plugin), connect, then press shift+m in Metro and open @keyframerdev/inspector. The npm README has the details, bare React Native included, and react-native/example is an Expo app with it all set up.

// babel.config.js (Expo)

plugins: process.env.NODE_ENV !== 'production' ? ['@keyframerdev/inspector/babel'] : []

// your root layout

if (DEV) require('@keyframerdev/inspector/devtools').connectDevTools({ app: 'MyApp' })

iOS.

import KeyframerInspector

#if DEBUG KeyframerInspector.start() // simulator: ws://127.0.0.1:8790 KeyframerInspector.start(.init(host: "192.168.1.20")) // a device: the Mac's LAN address #endif

Android.

// Application.onCreate (debuggable builds only)

Keyframer.start(this) ObjectAnimator.ofFloat(title, View.ALPHA, 0f, 1f).kfTrack("title").start()

Flutter.

void main() => runApp(const KeyframerInspector(app: 'My app', appPackage: 'my_app', child: MyApp()));

Each folder's README covers the API, what is reported and how, and its tests.

The desktop app

Keyframer Inspector for macOS (Apple silicon and Intel) is where every SDK connects. Download it from Releases. It is free, signed and notarized, and keeps itself up to date.

Every platform, one place. iOS, Android, Flutter and React Native apps connect to it on ws:// :8790: simulators and emulators on their own, devices on the same network with the address the status bar shows. Several apps at once, with a switcher.
The panel. Record, then drag to scrub: the app follows, back to the screen it was on. Tracks show every animation as segments you can click to tune (duration, delay, spring) live, then apply the numbers to your source. Problems come ranked by the frames they cost, each with where it is, what was running and the fix. Compare two sessions, before and after a change. Open any step in Cursor, VS Code, Zed or Xcode.
An MCP server for coding agents. Built in, one switch in Settings, and nothing else to install. Claude Code, Codex, Cursor, VS Code, Windsurf, Zed and Claude Desktop can record your app, run its scenarios, read the trace and the problems, and take screenshots. With check and recheck an agent runs the fix loop: measure, change the code, measure again, until the problems are gone and the motion still works. Settings shows the setup for each client; for Claude Code:

  claude mcp add --transport http keyframer-inspector http://127.0.0.1:8789/mcp

A recordings library. Recordings (.kfrec.json) from the panel, from testers' devices or from share links land in one folder. Double-click one to open it; share links open in the app.
In the menu bar. Closing the window keeps the relay running. The menu shows the connected apps and the MCP server, with switches for the server and for launching at login.
Updates on its own. It checks after launch and every six hours, downloads in the background and installs when you restart or quit. Every update is signed, and the app installs nothing else.
Local. Recordings, the relay and the MCP server stay on your Mac. Nothing leaves it unless you make a share link.

Protocol

Every SDK speaks one wire protocol, protocol/inspector.ts: hello, the signals an app exposes, animation events with their call sites, frames, screens, recordings, and what an editor sends back (record, scrub, overrides, scenarios). A new platform needs only to speak it.

Issues and contributions

Issues for any platform, the desktop app and the npm package go here. This repository is published from Keyframer's own; pull requests are welcome, and land here once merged there.

License

MIT for everything in this repository (LICENSE). The desktop app is free and closed source. In the npm package, what runs in your app is MIT (its source is react-native/), and the tools (the CLI, the MCP server and the panel) are under the Functional Source License; see its LICENSE.md.

Keyframer Inspector

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

FactLot

README from the maker

Keyframer Inspector

Quick start

The desktop app

Protocol

Issues and contributions

License