Pricing

Account and suite tiers

One Castling account. One suite tier. Castle AI message limits and MCP/CLI call caps scale together from Free to Ultra.

Suite tiers are for personal use only. For enterprise or team needs, contact us.

Free

Start with filing-backed research and light Castle AI usage.

$0forever
  • 50 MCP/CLI calls / month
  • 5 Castle AI messages / day
  • Castle AI/MCP/CLI: 4 years history
  • Dashboard: 5 years history
  • Material 8-Ks: last 30 days
  • Watchlist: 5 tickers
  • 4 tool calls / message
  • Personal use
Create free account
Standard

Reliable everyday suite access for ongoing research.

$12.99/ month
  • 500 MCP/CLI calls / month
  • 30 Castle AI messages / day
  • History since 2009*
  • Overview: full brief, health, peers, guidance
  • Segments: history since 2020
  • Material 8-Ks: last 90 days
  • Watchlist: 50 tickers
  • 8 tool calls / message
  • Personal use
Get started
Popular
Pro

Higher Castle AI, MCP, and CLI headroom for serious workflows.

$24.99/ month
  • 2,000 MCP/CLI calls / month
  • 40 Castle AI messages / day
  • History since 2009*
  • Overview: full brief, health, peers, guidance
  • Segments: history since 2020
  • Material 8-Ks: last 90 days
  • Watchlist: 100 tickers
  • 15 tool calls / message
  • Personal use
Get started
Ultra

Maximum suite capacity for heavy research and automation.

$69.99/ month
  • 10,000 MCP/CLI calls / month
  • 100 Castle AI messages / day
  • History since 2009*
  • Overview: full brief, health, peers, guidance
  • Segments: history since 2020
  • Material 8-Ks: last 90 days
  • Watchlist: 100 tickers
  • 30 tool calls / message
  • Personal use
Get started

MCP and CLI usage resets on the calendar month (Free) or billing period (paid). Castle AI messages reset each UTC day. Start a paid plan from Settings when you are signed in.

Paid plans renew automatically each billing period until you cancel through Manage subscription (Stripe Customer Portal).

* Paid history goes back to 2009 when available. Not every company has filings that far.

How the tier applies

Account

Your Castling account unlocks Castle AI with daily message caps and tool limits that match your suite tier. Sign up from Settings to start on Free.

Sign up

MCP

The same tier gates history depth and monthly call volume for compatible MCP assistants. Connect once with OAuth; caps follow your suite entitlement.

Connect MCP

CLI

The CLI uses that same monthly call cap and history depth. Run castling in a terminal or through a coding agent. Node.js 22+ is required.

Install the CLI