What is Tech Dev Notes?

Tech Dev Notes catalogs how iOS and Android apps are built: store and in-app screens, SDKs detected in shipped builds, version history, and chart rankings. The same catalog is available to agents through the public API and the MCP server.

Which apps do you track?

We track leading apps including ChatGPT, Grok, Claude, Google Gemini, Microsoft Copilot, Perplexity, DeepSeek, Meta AI, Le Chat by Mistral AI, Character AI, and Poe. Both iOS and Android versions.

How often is the data updated?

App Store and Google Play rankings and versions are collected every 12 hours. In-app screens are added when a capture run stores them. Tech stacks come from analysed builds, not from every store listing.

Is this data free to use?

Rankings, version history, and screenshots on the site are free to read. Agents call /api/v1 and the MCP server at /api/mcp with a key that starts with tdn_. Email alerts cover new versions and large rank changes for tracked apps.

Track how the top AI apps move.

Chart ranks in 197 countries, new versions and tech stack changes, checked every 12 hours. One email each Monday.

Try asking:Top climbers on the App Store this week Biggest drops on the App Store this week Where does ChatGPT rank?

Pick 3 apps to follow See this week's changes

Top AI apps on the US App Store

Checked every 12 hoursLive

See all charts

What the top AI apps are built with

Languages, UI frameworks and third-party SDKs detected in each app's shipped iOS build. 352 apps analysed so far.

All tech stacks Build an app like these

This week

Rank moves and releases from 2 to 8 Nov 2026.

All changes

More than a leaderboard

Every number comes from the stores and from the builds the apps actually ship.

Use it from your AI agent

Ask Claude, ChatGPT or Cursor about any app’s ranks, versions and stack. Create a free key on your account page, then paste this config.

API and MCP docs

mcp.json

{
  "mcpServers": {
    "techdevnotes": {
      "url": "https://techdevnotes.com/api/mcp",
      "headers": {
        "Authorization": "Bearer tdn_YOUR_KEY"
      }
    }
  }
}

Weekly app changes, in one email.

Releases, rank moves and rating shifts, once a week.

Free. Weekly. Unsubscribe in one click.