Appleseed MCP

Don’t let AI YOLO your retirement plan.

Connect Appleseed to ChatGPT, Claude or Gemini. You talk, and Appleseed’s engine does the math: 500 simulated markets, taxes, healthcare, housing and Social Security. The same answer every time.

Free  ·  No account needed  ·  Two minutes to set up
Why it matters

Same couple. Three different answers.

We gave Claude Opus 5.5 the same couple three times: 61 and 59, $1.48M saved, retiring next year. Each time it wrote a brand new (and different) model from scratch, and took about five minutes. Appleseed answered in seconds.

Chance their savings last  ·  same facts each time
29%
42%
27%
88%
92%
Opus 1
5 min
Opus 2
5 min
Opus 3
5 min
Appleseed
seconds
Competitor

Test run Oct 4, 2026. Claude Opus 5.5 writing its own simulation from identical household details each try.

Set up

Connect in two minutes.

Add Appleseed once, then use it in any chat. Menus move around between app versions, so the exact labels may differ slightly.

ChatGPT

Add it as a custom MCP server

  1. 1
    Open Settings, then Plugins.
  2. 2
    Click Add, then Create custom MCP server.
  3. 3
    Name it Appleseed and paste this as the server URL:
    https://appleseedplanner.com/mcp
  4. 4
    Set Authentication to none, accept the notice, and create it.
  5. 5
    In a new chat, turn on Appleseed and ask about your retirement.
Claude

Add it as a custom connector

  1. 1
    On claude.ai, open Settings, then Connectors.
  2. 2
    Click Add custom connector.
  3. 3
    Name it Appleseed and paste this as the URL:
    https://appleseedplanner.com/mcp
  4. 4
    In a new chat, turn on Appleseed from the tools menu and ask away.
Gemini in Antigravity

Add it in Settings

  1. 1
    Open Settings, then MCP Servers.
  2. 2
    Click Add Server (or +).
  3. 3
    Name it Appleseed and paste this as the server URL:
    https://appleseedplanner.com/mcp
  4. 4
    Save, and in your chat ask the agent about your retirement.
Using Claude Code? Run this in your terminal instead:
claude mcp add --transport http appleseed https://appleseedplanner.com/mcp
Then just ask

Talk to it like you would an advisor.

The AI asks for what it needs, Appleseed runs the plan, and you can try what-ifs and stress tests in seconds. Every assumption is shown, and you can change any of them.

“I'm 61 and my wife is 59. We have $1.4M saved, a paid-off house, and spend about $90k a year. Can we both retire next year?”

“I'm 34, make $95k, and have $135k saved. Can I retire at 55? What if I buy a $400k house in three years?”

“I'm 47 with $2.5M invested, $900k of it in Nvidia stock. What happens to my plan if the stock crashes?”

  • Free, no account. Your plan is saved behind a private link the chat keeps.
  • Open it in Appleseed. Every answer links to the full plan, with charts and every year in detail.
  • Same engine as the app. Tested rigorously for 2 years over 25,000+ plans.
  • A diagnostic, not advice. It shows tradeoffs; it won’t tell you what to buy or sell.
Prefer the full app?  ·  Free

See what a real engine says about your plan.

Build a fiduciary-grade plan in about five minutes. No spreadsheet required.