RetireNavigator Studio

RetireNavigator Studio is an offline-first, client-side retirement planning and decumulation platform designed for self-directed DIY planners, engineers, and financial independence seekers.

Most personal finance platforms force users into recurring monthly subscriptions, require linking live bank accounts via third-party data scrapers, and store confidential balance sheets on central cloud servers.

RetireNavigator Studio operates on a strictly local-first architecture: your personal data never leaves your machine. Calculations execute entirely in-browser, and your plans persist locally with zero tracking telemetry, no third-party pixels, and no mandatory cloud accounts.

Always-Free Core Tier: Navigator Essentials The baseline personal planner is completely free for DIY planning:

• Permanent Core Engine: Full access to deterministic Monte Carlo projections, asset allocation modeling, and baseline decumulation spending curves.
• No Paywalls or Trials: No account registration required, no credit card prompts, and no expiration dates.
• Local Data Ownership: Save, export, and manage your scenarios directly on your local device.

Advanced Analytical Capabilities For complex scenarios and multi-bucket decumulation modeling, the platform includes:

• Interactive Roth Conversion Studio: Stress-test conversion schedules year-by-year to fill specific tax brackets and evaluate the real lifetime benefit against deferred tax growth.
• Statutory Tax Transparency & IRMAA Lookbacks: Gross-to-Taxable ledgers modeling statutory federal tax schedules, all 50 state tax brackets (including California's distinct married-filing-jointly schedules), capital gains stacking, and automated 2-year lookback warnings for Medicare Parts B and D IRMAA surcharges.
• 9x9 Spousal Social Security Optimizer: Evaluate 81 concurrent claiming age combinations to maximize cumulative lifetime household benefits.
• Net-Portfolio Spending Guardrails: Dynamic withdrawal guardrails evaluate only the portion of spending funded by your investment portfolio, protecting guaranteed base income (pensions, Social Security) from artificial spending cuts during market pullbacks.
• True Brokerage Cost-Basis Drawdowns: Models taxable brokerage withdrawals against actual entered or imported cost basis rather than arbitrary gain assumptions, with cash classification for Treasury bills and configurable Qualified Dividend percentages.

Engineering & Offline Architecture

• Client-Side Heavy Compute: Multi-threaded speculative bisection solvers, 81-scenario Social Security claiming passes, and 100-year historical rolling cohorts.
• Strict Air-Gap Support: Runs as an offline Progressive Web App (PWA). Once cached, the application functions with zero internet connection, with settings toggles to disable update polling entirely.