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SPECIFICTION
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Flexible Retirement Planner

flexibleretirementplanner.com

Free plan WebWindowsmacOSLinux
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Spec score 8.8 #5 of 26 in Retirement Planning Software

What it is

Flexible Retirement Planner models retirement outcomes with Monte Carlo simulation and reports the probability that a plan succeeds. It runs 10,000 simulated paths spanning savings accumulation and retirement spending. Users can compare Stable, Flexible, and Conservative spending policies, test different assumptions, and use sensitivity analysis to see which inputs affect results most. The standalone version lets users save inputs and maintain multiple what-if scenarios, and it works offline. The planner includes income and savings growth projections, withdrawal planning, detailed tax modeling, and Social Security modeling. Standalone downloads are provided for Windows and Mac/Linux; the Windows version does not require Java. The planner is free for individual non-commercial use, and educators and trainers may use it for educational purposes. A voluntary contribution of any amount unlocks a personal-use license key. Commercial use, including by financial planners, is not authorized or supported. Its maker, Random Walk Ventures LLC, created it in 2006.

Spec sheet

What it does
Flexible Retirement Planner uses Monte Carlo simulation to model retirement outcomes and reports a probability of success.Read 20 Oct 2026 · flexibleretirementplanner.com
Purpose
The planner uses Monte Carlo simulation to model retirement outcomes and reports a probability of success.Read 29 Sep 2026 · flexibleretirementplanner.com
Security
The license agreement says the website may not be continuously available, secure, or private and makes no guarantee that use will be uninterrupted or error-free.Read 29 Sep 2026 · flexibleretirementplanner.com
Support
The maker directs users with launch errors to contact support by email and also invites questions through its support forum.Read 29 Sep 2026 · flexibleretirementplanner.com
Founded
2006Read 28 Sep 2026 · flexibleretirementplanner.com
Account types
The model separates taxable, tax-deferred, and tax-free investment balances and applies different tax treatment to each.Read 20 Oct 2026 · flexibleretirementplanner.com
API and SDK
The official documentation describes downloadable software, web tools, and code snippets but does not publish an API or SDK.Read 20 Oct 2026 · flexibleretirementplanner.com
Cash-flow modeling
Additional Inputs supports year ranges, annual amounts, taxable income percentages, and several cost-of-living adjustment methods for cash flows.Read 20 Oct 2026 · flexibleretirementplanner.com
Commercial licensing
Commercial use, including use by financial planners, is not authorized or supported by the maker.Read 20 Oct 2026 · flexibleretirementplanner.com
Commercial use
The planner is intended for personal educational use and is not authorized or supported for commercial use, including by financial planners.Read 29 Sep 2026 · flexibleretirementplanner.com
Company and history
Random Walk Ventures LLC created the planner in 2006; Jim Richmond is the company’s founder and president.Read 29 Sep 2026 · flexibleretirementplanner.com
Company headquarters
The license identifies Random Walk Ventures LLC as operating from New Hampshire, United States.Read 20 Oct 2026 · flexibleretirementplanner.com
Conservative policy
Conservative spending withholds inflation increases when the portfolio falls below its inflation-adjusted starting balance.Read 20 Oct 2026 · flexibleretirementplanner.com
Default inflation limitation
Inflation is constant by default and is not correlated with prior inflation or portfolio returns.Read 20 Oct 2026 · flexibleretirementplanner.com
Documentation depth
The site provides documentation pages covering overview, inputs, spending policies, additional inputs, settings, outputs, sensitivity analysis, source code, and further reading.Read 20 Oct 2026 · flexibleretirementplanner.com
Flexible policy
Flexible spending can rise above the original plan after strong portfolio performance and is reduced or held back in weak periods.Read 20 Oct 2026 · flexibleretirementplanner.com
Founder
Jim Richmond is identified as founder and president of Random Walk Ventures LLC.Read 20 Oct 2026 · flexibleretirementplanner.com
Goal seek
Goal-seek can search for retirement variables that achieve a target probability, but may find multiple solutions or fail to converge.Read 20 Oct 2026 · flexibleretirementplanner.com
Income modeling
Users can enter retirement income such as Social Security, pensions, annuities, or other income with a start age.Read 20 Oct 2026 · flexibleretirementplanner.com
Independent classification
An AAII Houston retirement-calculator presentation classifies the product as a Java application with high-fidelity average-return and Monte Carlo modeling and a $0-$20 cost range.Read 20 Oct 2026 · aaiihouston.org
License installation limit
A named user may install the software on up to two computers or devices.Read 20 Oct 2026 · flexibleretirementplanner.com
License restrictions
The license prohibits copying, redistribution, sublicensing, reverse engineering, and deriving source code.Read 20 Oct 2026 · flexibleretirementplanner.com
Limit: commercial use
The lack of supported commercial licensing excludes financial planners and other business users.Read 20 Oct 2026 · flexibleretirementplanner.com
Limit: model simplicity
The official technical notes acknowledge that modeling only aggregate portfolio returns may oversimplify real portfolios.Read 20 Oct 2026 · flexibleretirementplanner.com
Limit: withdrawal strategies
An independent Bogleheads discussion reports that the planner does not explicitly implement Guyton-Klinger or VPW withdrawal strategies.Read 20 Oct 2026 · bogleheads.org
Maker history
Random Walk Ventures LLC created Flexible Retirement Planner in 2006.Read 20 Oct 2026 · flexibleretirementplanner.com
Offline operation
The standalone planner is installed on a computer and can save plans locally for later use.Read 20 Oct 2026 · flexibleretirementplanner.com
Offline use
The standalone planner runs without an internet connection.Read 29 Sep 2026 · flexibleretirementplanner.com
Open-source status
The product is proprietary and only selected incomplete source-code sections are published.Read 20 Oct 2026 · flexibleretirementplanner.com
Platform details
The maker provides standalone downloads for Windows and for Mac/Linux; its Windows standalone version does not require Java.Read 29 Sep 2026 · flexibleretirementplanner.com
Portfolio model
The simulation models overall portfolio return with user-supplied average return and standard deviation instead of modeling individual asset-class correlations.Read 20 Oct 2026 · flexibleretirementplanner.com
Praise: adaptive withdrawals
A Financial Mentor retirement-calculator discussion identifies Flexible Retirement Planner as a tool that can model spending cuts or returning to work after poor market years.Read 20 Oct 2026 · financialmentor.com
Praise: detailed inputs
BellaOnline praises the ability to enter ages, balances, income, spending, inflation, portfolio assumptions, and time-based return changes.Read 20 Oct 2026 · bellaonline.com
Praise: spending controls
BellaOnline highlights the choice among stable, flexible, and conservative spending plans as useful for testing retirement behavior.Read 20 Oct 2026 · bellaonline.com
Praise: usability
An independent BellaOnline review describes the interface as initially complex but learnable and says rerunning scenarios helps users explore improvements.Read 20 Oct 2026 · bellaonline.com
Public code details
The site publishes Java snippets for the main simulation loop and spending decision rules, but the snippets do not compile as a complete program.Read 20 Oct 2026 · flexibleretirementplanner.com
Scenario analysis
The standalone edition saves inputs and supports multiple what-if scenarios.Read 20 Oct 2026 · flexibleretirementplanner.com
Security terms
The license disclaims guarantees that the website will be secure, private, continuously available, uninterrupted, or error-free.Read 20 Oct 2026 · flexibleretirementplanner.com
Sensitivity analysis
Sensitivity Analysis varies two selected inputs across a heatmap generated from many simulation runs.Read 20 Oct 2026 · flexibleretirementplanner.com
Simulation
It runs 10,000 simulated retirement paths covering both accumulation and spending phases.Read 29 Sep 2026 · flexibleretirementplanner.com
Simulation volume
The planner runs 10,000 simulated retirement paths covering both accumulation and spending phases.Read 20 Oct 2026 · flexibleretirementplanner.com
Spending policies
Users can choose Stable, Flexible, or Conservative retirement spending policies.Read 20 Oct 2026 · flexibleretirementplanner.com
Stable policy
Stable spending attempts to fund the requested annual spending, adjusted for inflation, from portfolio assets after other income.Read 20 Oct 2026 · flexibleretirementplanner.com
Support channel
Users are directed to email support for launch errors and may post questions on the support forum.Read 20 Oct 2026 · flexibleretirementplanner.com
Supported downloads
The maker provides separate downloads for Windows and for Mac/Linux.Read 20 Oct 2026 · flexibleretirementplanner.com
Warranty terms
The software is supplied on an as-is basis and the license disclaims warranties of accuracy, performance, compatibility, and fitness for purpose.Read 20 Oct 2026 · flexibleretirementplanner.com

Plans and prices

Personal Edition Free Voluntary contribution suggested at $10-20; any contribution provides a license key Non-commercial personal use · educator/training use allowed · commercial use unsupported Read 20 Oct 2026 · flexibleretirementplanner.com
Personal use Free Free for individual non-commercial use · educators and trainers may use it free for educational purposes · voluntary contribution of any amount unlocks a personal-use license key Read 29 Sep 2026 · flexibleretirementplanner.com

Every Flexible Retirement Planner plan and price →

Strong points and limits

Strong points

  • Models 10,000 retirement paths.
  • Offers three retirement spending policies.
  • Standalone version works offline.
  • Includes detailed tax and Social Security modeling.

Limits

  • Commercial use is not authorized or supported.
  • Website availability, security, and privacy are not guaranteed.

Who it suits

It suits individuals exploring retirement assumptions and educators or trainers using it for educational purposes. It is not authorized or supported for commercial use, including by financial planners.

Verdict

Flexible Retirement Planner offers broad retirement projections and scenario analysis at no cost for individual non-commercial use. Its commercial-use restriction and website disclaimers matter for anyone relying on it professionally or online.

Where Specifiction places it

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