About

A Small Planning Laboratory

Portfolio Laboratory is built for quick retirement planning experiments: change balances, account buckets, return assumptions, contribution rates, and retirement spending, then see how the plan moves.

The first version is intentionally local-first. It does not ask for a login, does not connect to brokerage accounts, and does not upload your portfolio data.

It also does not recommend securities, tax positions, payroll elections, or retirement actions. Outputs are estimates based on user-entered assumptions.

This site is provided as-is with no guarantees. It is for education and planning only, and it is not financial, tax, legal, payroll, or investment advice.