Android Viewer

Name: Android Viewer
Author: acertijosapps

by acertijosappsversion 1.0.2i★ –iRuns on your computer

Registry nameio.github.acertijosapps/android-viewer

Install

Overview

Description from the maker (original English)

Drive Android emulators: screenshots, taps, swipes, keys, text, rotation and foldable postures.

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

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: ANDROID_VIEWER_URL, ANDROID_HOME

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": {
    "android-viewer": {
      "command": "npx",
      "args": [
        "-y",
        "@acertijosapps/android-viewer",
        "mcp"
      ],
      "env": {
        "ANDROID_VIEWER_URL": "your-value",
        "ANDROID_HOME": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add android-viewer --env ANDROID_VIEWER_URL=your-value --env ANDROID_HOME=your-value -- npx -y @acertijosapps/android-viewer 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": {
    "android-viewer": {
      "command": "npx",
      "args": [
        "-y",
        "@acertijosapps/android-viewer",
        "mcp"
      ],
      "env": {
        "ANDROID_VIEWER_URL": "your-value",
        "ANDROID_HOME": "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": {
    "android-viewer": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@acertijosapps/android-viewer",
        "mcp"
      ],
      "env": {
        "ANDROID_VIEWER_URL": "your-value",
        "ANDROID_HOME": "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

ANDROID_VIEWER_URL env
Viewer to show actions live (default http://localhost:8093); without it, adb is used directly
ANDROID_HOME env
Android SDK location, if adb and emulator are not found automatically

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account acertijosapps, which owns the repo
… 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 32451 servers in this category
Published to the registry more recently than 90% of the other 32451 servers in this category
Basic checks equal to or better than 100% of the other 32451 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 Android Viewer 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?

The registry does not list a required key, though some servers ask you to sign in on first use.

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 (1.0.2) reached the registry 3 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, Recta

Alternatives

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

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Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

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Runs in the cloudUpdated today

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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.

@acertijosapps/android-viewer

Live Android emulator viewer for the browser, plus an MCP server so an AI agent can drive it. Built for the browser pane of AI coding tools (such as Claude Code): you and the agent watch and control the same emulator, in real time, including foldable postures.

Live video: adb exec-out screenrecord (H.264) over WebSocket, decoded in the browser with WebCodecs.
Input: click, drag, long press and scroll become adb shell input commands.
Every AVD on your machine: pick a running emulator or start a stopped one from the viewer.
Emulator controls: Back, Home, Recents, Power, Volume, Rotate, full-resolution screenshot.
Foldables: Closed / Half-opened / Opened / Rear display. On emulators they move the simulated hinge, like the emulator's own controls; the stream follows the active display when you fold or rotate.
MCP server: the same actions as tools, so the agent's taps show up live in the viewer.
Nothing to install on the device: no APK, no server push; only adb.

Requirements

Node.js 18 or later.
Android SDK platform tools (adb) and, to list and start AVDs, the emulator. Found through ANDROID_HOME, ANDROID_SDK_ROOT or the default SDK location; override with ADB and EMULATOR.
A browser with WebCodecs (Chromium-based browsers, Safari 16.4+, Firefox 130+).
Works on macOS, Linux and Windows.

Quick start

npx @acertijosapps/android-viewer

Open http://localhost:8093 and pick a device. Deep links: ?avd=Pixel_10 or ?serial=emulator-5554.

android-viewer [options]        Start the viewer

android-viewer mcp [options] Start the MCP server on stdio

-p, --port Viewer port (default 8093, env PORT) --host Interface to bind (default 127.0.0.1, env HOST) --viewer-url Viewer the MCP talks to (default http://localhost:8093)

Other environment variables: MAX_DIM (longest side of the encoded video, default 1024), BIT_RATE (default 6M), SCREENSHOT_MAX (longest side of MCP screenshots, default 1024) and DEBUG=1 (logs every input command).

Use it with an AI agent (MCP)

Claude Code:

claude mcp add android-viewer -- npx -y @acertijosapps/android-viewer mcp

Any other MCP client:

"mcpServers": { "android-viewer": { "command": "npx", "args": ["-y", "@acertijosapps/android-viewer", "mcp"] } } }

Also listed in the official MCP Registry as io.github.acertijosapps/android-viewer.

Keep the viewer running (npx @acertijosapps/android-viewer) to watch what the agent does. Without it, the MCP drives the device through adb directly.

Tool	What it does
`list_devices`	AVDs on the machine (with `serial` and `booted` when running) and other adb devices
`launch_avd`	Start an AVD by name
`get_state`	Display size, rotation, current posture, available postures and the viewer URL
`screenshot`	PNG of the active display, longest side ≤ 1024 px
`tap`	`input tap`
`swipe`	`input swipe`; same start and end with ≥ 500 ms is a long press
`press_key`	back, home, recents, power, wakeup, volup, voldown, enter, delete, tab, escape
`type_text`	`input text` (printable ASCII)
`rotate`	Rotate 90° left or right (emulators)
`set_posture`	closed, half_opened, opened, rear_display, a state id, or `reset`; returns the new state

Coordinates are normalized to 0–1 over the screenshot (x = pixel_x / image_width), so they hold in any posture or orientation. serial is optional when only one device is connected.

In the Claude Code browser pane

Add the viewer to .claude/launch.json and open it with preview_start android-viewer:

"version": "0.0.1", "configurations": [ { "name": "android-viewer", "runtimeExecutable": "npx", "runtimeArgs": ["-y", "@acertijosapps/android-viewer"], "port": 8093, "autoPort": false } ] }

HTTP API

The MCP uses the viewer's API; you can call it too. serial goes in the query string or the body and is optional with a single device. POST requests require content-type: application/json and a local origin, so other websites can't drive your devices.

Endpoint
`GET /api/devices`	`[{ avd, serial, booted, model }]`: `serial: null` = stopped, `booted: null` = didn't answer in time
`GET /api/state`	Display size, rotation, `displayId`, posture and available postures
`GET /api/screenshot?max=`	PNG; real screen size in `X-Screen-Width` / `X-Screen-Height`
`POST /api/tap`	`{ x, y }`
`POST /api/swipe`	`{ x1, y1, x2, y2, ms }`
`POST /api/key`	`{ key }`
`POST /api/text`	`{ text }`
`POST /api/posture`	`{ posture }`
`POST /api/rotate`	`{ direction: "left" \	"right" }`
`POST /api/launch`	`{ avd }`

When a viewer tab is watching the device, actions go through its live session: the viewer updates at once and a watchdog restarts the stream if a gesture produces no frames.

How it works

One session per device, shared by every tab, stopped when the last one closes.
Every second it reads dumpsys display (size, rotation and the physical display behind logical display 0) and cmd device_state state. When the display changes, it waits for it to settle and restarts screenrecord with --display-id of the new panel: folding a device switches panels.
screenrecord only emits frames when the screen changes, so the viewer keeps the GOP since the last IDR for late joiners and sends a screenshot while there is no video.
Only one screenrecord runs per device at a time: two of them exhaust the emulator's software encoder (err=-38). Restarts requested by clients are rate-limited.
Screenshots use raw screencap (compressing PNG inside the emulator is slow under load), are scaled down by area averaging and encoded as PNG with node:zlib, with no native dependencies.

Limitations

Drags are sent on release (one input swipe with the real duration), not live.
No keyboard passthrough or audio yet; use type_text and press_key.
Higher latency than a native client such as scrcpy.
The software encoder slows down with several emulators recording at once; with little free RAM (emulators paged out to swap) every adb shell call can take seconds.
If an app requests its own posture (DeviceStateManager.requestState), it wins over set_posture while it is in the foreground.
Flip_Horizontal_Fold style AVDs with a single physical display change state when closed, but the picture stays the same.

Why not ws-scrcpy?

ws-scrcpy was tried first: streaming and input work, but the video freezes on a posture change until you reload (its scrcpy 1.19 server stays bound to the previous display), and it has no posture controls.

Contributing

Branching model (main · beta), Conventional Commits and releases are described in CONTRIBUTING.md; changes are listed in CHANGELOG.md.

Author

Made by AcertijosApps. See the rest of our libraries at acertijosapps.com/librerias.

Questions or proposals: acertijos.contacto@gmail.com or open an issue.

License

MIT

Android Viewer

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

Recta

README from the maker

@acertijosapps/android-viewer

Requirements

Quick start

Use it with an AI agent (MCP)

In the Claude Code browser pane

HTTP API

How it works

Limitations

Why not ws-scrcpy?

Contributing

Author

License