App-Kit

io.github.app-kit-devv0.1.3Updated Oct 5, 2026

SEO audit (400 checks), text readability and grammar check, PDF to images, image conversion.

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Overview

AI-generated overview

Remote MCP server for SEO audits, text readability and grammar checks, and PDF or image conversion.

What it does
App-Kit is a hosted MCP service with tools for auditing a public website's SEO (score, failed checks, top losses), checking text for readability, keyword stuffing, stop phrases and grammar in Russian and English, and converting files: PDF pages to PNG/JPEG/WebP, images to PDF, and between image formats. Long jobs return a handle that a status tool polls. Results that are files come back as short-lived download links.
When to use it
Useful when an assistant needs to review a live site's SEO, proofread or score marketing copy, or turn PDFs and images into other formats without leaving the chat. It suits occasional, low-volume checks rather than bulk or scheduled processing.
Requirements
A remote Streamable HTTP endpoint; nothing to install. Anonymous use works out of the box. A free token from the provider's site raises limits and is passed as the Authorization header (Bearer mcpf_...) or in the URL path. Network access to the endpoint and to any URLs being audited or converted is required.
Before you install
The optional Authorization token is a credential; treat it as a secret and prefer a header over embedding it in a URL. Audited pages and converted files are fetched by the hosted service, so only submit URLs you are willing to share with a third party. Free tiers have per-tool hourly and shared daily limits, and higher limits are paid. Tools are described as read-only, and text sent for checking is not stored.

Installation

In SourceWeft

  1. Open App-Kit in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "mcp": {
      "type": "http",
      "url": "https://mcp.app-kit.dev/mcp"
    }
  }
}

README

App-Kit MCP

[MCP] [Endpoint] [Free tier] [License: MIT]

Remote MCP server for SEO audits, text readability and grammar checks, image conversion (PNG/JPEG/WebP) and PDF to images - for Claude, Cursor, VS Code, Windsurf and any other MCP client. Free tier with daily limits, no sign-up.

https://mcp.app-kit.dev/mcp

Русская версия | Tools reference | app-kit.dev

This repository holds the public documentation, client configs and registry metadata. The server itself is a hosted service operated by App-Kit; there is nothing to install.

What it does

  • SEO audit of a website - score 0-100 by group, failed checks and the five biggest losses. The engine runs 400 checks (technical SEO, performance, structured data, AI-readiness and more); the fast mode covers up to 10 pages in about a minute.
  • Text check - readability, "water" and keyword stuffing metrics, stop phrases and grammar (LanguageTool) for Russian and English, up to 20 000 characters. Returns positions of issues, not copies of your text.
  • PDF and images - PDF pages to PNG/JPEG/WebP, images to PDF, format conversion (WebP/AVIF compression is coming soon). Files are passed by URL or via a one-time upload link, never as huge base64 strings in the chat.

Quick start

Works anonymously out of the box. For higher limits, get a free token on app-kit.dev/mcp (one click, no email) and pass it either as a header Authorization: Bearer mcpf_... or in the URL: https://mcp.app-kit.dev/mcp/t/mcpf_....

Claude Code

bash
claude mcp add --transport http app-kit https://mcp.app-kit.dev/mcp
# with a free tokenclaude mcp add --transport http app-kit https://mcp.app-kit.dev/mcp \  --header "Authorization: Bearer mcpf_your_token"

Add --scope user to make it available in every project. See examples/claude-code.sh.

Claude.ai and Claude Desktop

Customize > Connectors > + > Add custom connector. Name: App-Kit, Remote MCP server URL: https://mcp.app-kit.dev/mcp/t/mcpf_your_token (the token in the URL is recommended: requests from claude.ai share Anthropic's IP addresses, so anonymous limits there are a small shared pool). Authentication: no sign-in. Free Claude plans allow one custom connector. Details: examples/claude-desktop/claude.ai.md.

Cursor

.cursor/mcp.json in the project or ~/.cursor/mcp.json globally (example):

json
{  "mcpServers": {    "app-kit": {      "url": "https://mcp.app-kit.dev/mcp",      "headers": { "Authorization": "Bearer mcpf_your_token" }    }  }}

VS Code (GitHub Copilot agent mode)

.vscode/mcp.json (example); VS Code asks for the token once and stores it securely:

json
{  "inputs": [    { "type": "promptString", "id": "app-kit-token", "description": "App-Kit MCP free token (mcpf_...)", "password": true }  ],  "servers": {    "app-kit": {      "type": "http",      "url": "https://mcp.app-kit.dev/mcp",      "headers": { "Authorization": "Bearer ${input:app-kit-token}" }    }  }}

Windsurf (Devin Desktop)

Open the MCP config from the Cascade MCP settings (mcp_config.json) and add a server with serverUrl. ${env:VAR} is expanded in headers:

json
{  "mcpServers": {    "app-kit": {      "serverUrl": "https://mcp.app-kit.dev/mcp",      "headers": { "Authorization": "Bearer ${env:APPKIT_MCP_TOKEN}" }    }  }}

Other clients

Any client that supports remote MCP over Streamable HTTP: URL https://mcp.app-kit.dev/mcp, optional header Authorization: Bearer mcpf_.... Clients that cannot set headers can use https://mcp.app-kit.dev/mcp/t/mcpf_....

Tools

Full descriptions and JSON Schemas: docs/tools.md (generated from the live tools/list).

ToolWhat it doesExample prompt
seo_audit_fastFast SEO audit of a site root (up to 10 pages): score, failed checks, top-5 losses. Waits up to 60 s, then returns a handle"Run an SEO audit of example.com and tell me what to fix first"
seo_audit_statusStatus and result of an audit by handle(called by the model automatically)
text_checkReadability, water/spam metrics, stop phrases, grammar; lang ru/en, up to 20 000 chars"Check this landing page copy for readability and grammar: ..."
quota_statusYour access level and remaining free calls per tool"How many free App-Kit checks do I have left today?"
image_convertConvert between PNG, JPEG, WebP, BMP, TIFF, GIF"Convert this logo to PNG: https://example.com/logo.webp"
pdf_to_imagesRender PDF pages (up to 20) to PNG/JPEG/WebP"Turn pages 1-3 of https://example.com/deck.pdf into PNG at 150 dpi"
images_to_pdfMerge up to 20 images into one PDF"Make a PDF from these 3 screenshots: ..."
conversion_statusStatus and result of a long conversion by handle(called by the model automatically)
create_uploadOne-time upload URL for a local file (agents with a shell)"Convert ./scan.pdf to PNG pages"
image_compress (coming soon)Compress to WebP/AVIF with quality and resize options"Compress https://example.com/hero.png to AVIF"

All tools are read-only: nothing is published or changed on your side. Results that are files come back as short-lived download links (10 minutes) plus a small preview.

Limits

ToolAnonymousFree tokenNotes
text_check10 / hour20 / hour
seo_audit_fast5 / hour10 / hourone domain: up to 20 audits per day from all users
seo_audit_status, conversion_status, quota_statusfreefreedo not spend quota
image_convert5 / hour20 / hour
pdf_to_images, images_to_pdf3 / hour10 / hourup to 20 pages / files, 20 MB
create_upload10 / hour30 / hourup to 20 MB, link valid 10 min

Every response includes quota (remaining, reset_at, tier, upgrade_url). The free tier also has a shared daily budget per tool; when it runs out, the tool says so and resets at 00:00 UTC. Limits may be tuned without notice; the current values are always in the tool descriptions and quota_status.

Pricing

The free tier above stays free. Higher limits, full multi-page SEO audits with PDF reports and larger files are part of the paid App-Kit API and are billed in App-Kit credits - see app-kit.dev.

Privacy

  • Processing happens in Germany (EU).
  • Text you send to text_check is not stored; only metrics are returned.
  • Files are kept only while being processed and deleted within 15 minutes; download links expire in 10 minutes.
  • IP addresses are used only for anonymous rate limits, as a salted hash kept for at most 24 hours.
  • Usage logs contain the tool name, timing and status - no IP addresses, texts, file contents or full URLs.
  • Page content from audited sites is never returned verbatim: only scores, check codes and short, clipped fields marked as page data.

Full policy: app-kit.dev/mcp.

FAQ

Do I need an account? No. Anonymous use works; a free token (no email) raises the limits.

Why do anonymous calls from claude.ai run out quickly? claude.ai connects from Anthropic's shared IP range, so all anonymous claude.ai users share one small pool. Use a token in the URL.

Can it audit my staging site? Only publicly reachable sites. Private networks, localhost and non-standard ports are blocked.

Which MCP protocol versions are supported? Streamable HTTP, stateless: current MCP revisions and clients on 2025-11-25. No stdio package is needed.

A long audit returned status: running. What now? The model calls seo_audit_status with the handle after poll_after_s seconds. The handle works only for the caller and expires in 60 minutes.

Is the server open source? The server is a hosted service. This repository (docs, examples, registry metadata) is MIT-licensed.

Where do I report a bug or a security issue? Bugs and ideas: issues. Security: see SECURITY.md.

Links

Source: README.md at commit 0915ebd

Tools

0
Tool metadata has not been indexed yet.

Version history

1
  1. v0.1.3LatestOct 5, 2026