Pricing

Account and suite tiers

One Castling account. One suite tier. Castle AI message limits and MCP 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 calls / month
  • 10 Castle AI messages / day
  • AI/MCP: 4 years history
  • Dashboard: 5 years history
  • Material 8-Ks: last 30 days
  • 4 tool calls / message
  • Personal use
Create free account
Standard

Reliable everyday suite access for ongoing research.

$12.99/ month
  • 500 MCP calls / month
  • 30 Castle AI messages / day
  • AI/MCP: history since 2009*
  • Dashboard: history since 2009*
  • Segments: history since 2020
  • Material 8-Ks: last 90 days
  • 8 tool calls / message
  • Personal use
Get started
Popular
Pro

Higher Castle AI and MCP headroom for serious workflows.

$24.99/ month
  • 2,000 MCP calls / month
  • 40 Castle AI messages / day
  • AI/MCP: history since 2009*
  • Dashboard: history since 2009*
  • Segments: history since 2020
  • Material 8-Ks: last 90 days
  • 15 tool calls / message
  • Personal use
Get started
Ultra

Maximum suite capacity for heavy research and automation.

$69.99/ month
  • 10,000 MCP calls / month
  • 100 Castle AI messages / day
  • AI/MCP: history since 2009*
  • Dashboard: history since 2009*
  • Segments: history since 2020
  • Material 8-Ks: last 90 days
  • 30 tool calls / message
  • Personal use
Get started

MCP 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

Suite

The same tier gates MCP history depth and monthly call volume for any AI with an MCP connector. Connect once with OAuth; caps follow your suite entitlement.

Connect MCP