Flexible Retirement Planner
Flexible Retirement Planner uses Monte Carlo simulation to model retirement outcomes and report a probability of success.
What Flexible Retirement Planner is
Flexible Retirement Planner uses Monte Carlo simulation to model retirement outcomes and report a probability of success. It runs 10,000 simulated paths covering both savings accumulation and retirement spending. Users can choose Stable, Flexible, or Conservative spending policies, examine which inputs have the most impact, and manage multiple what-if scenarios in the standalone version. The planner supports income projection, savings growth projection, withdrawal planning, detailed tax modeling, and Social Security modeling. Its standalone application runs without an internet connection, with downloads for Windows and for 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 use by financial planners, is not authorized or supported. The license agreement says the website may not always be available, secure, or private and does not guarantee uninterrupted or error-free use.
Good
- Runs 10,000 simulated retirement paths.
- Offers Stable, Flexible, and Conservative spending policies.
- Standalone version works offline.
- Windows standalone version does not require Java.
Watch out
- Commercial use, including by financial planners, is not supported.
- Website availability, security, and privacy are not guaranteed.
- Free use is for individual non-commercial purposes.
Who it suits
It suits individuals planning retirement who want to model scenarios for personal educational use. Educators and trainers may also use it for educational purposes.
Verdict
Flexible Retirement Planner offers scenario and sensitivity analysis alongside retirement projections. Its stated use is personal or educational, not commercial, and the standalone version can work offline.
Plans and prices
From Flexible Retirement Planner's own pricing page, checked 20 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Personal Edition | Free | Non-commercial personal use · educator/training use allowed · commercial use unsupported · Voluntary contribution suggested at $10-20; any contribution provides a license key |
| 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 |
The facts
Each one read from Flexible Retirement Planner's own pages, with the date it was checked.
What it does
- Account types
- The model separates taxable, tax-deferred, and tax-free investment balances and applies different tax treatment to each.checked 20 Oct 2026
- API and SDK
- The official documentation describes downloadable software, web tools, and code snippets but does not publish an API or SDK.checked 20 Oct 2026
- Cash-flow modeling
- Additional Inputs supports year ranges, annual amounts, taxable income percentages, and several cost-of-living adjustment methods for cash flows.checked 20 Oct 2026
- Commercial licensing
- Commercial use, including use by financial planners, is not authorized or supported by the maker.checked 20 Oct 2026
- Commercial use
- The planner is intended for personal educational use and is not authorized or supported for commercial use, including by financial planners.checked 29 Sep 2026
- Conservative policy
- Conservative spending withholds inflation increases when the portfolio falls below its inflation-adjusted starting balance.checked 20 Oct 2026
- Default inflation limitation
- Inflation is constant by default and is not correlated with prior inflation or portfolio returns.checked 20 Oct 2026
- Documentation depth
- The site provides documentation pages covering overview, inputs, spending policies, additional inputs, settings, outputs, sensitivity analysis, source code, and further reading.checked 20 Oct 2026
- Flexible policy
- Flexible spending can rise above the original plan after strong portfolio performance and is reduced or held back in weak periods.checked 20 Oct 2026
- Founder
- Jim Richmond is identified as founder and president of Random Walk Ventures LLC.checked 20 Oct 2026
- Goal seek
- Goal-seek can search for retirement variables that achieve a target probability, but may find multiple solutions or fail to converge.checked 20 Oct 2026
- Income modeling
- Users can enter retirement income such as Social Security, pensions, annuities, or other income with a start age.checked 20 Oct 2026
- 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.checked 20 Oct 2026
- License installation limit
- A named user may install the software on up to two computers or devices.checked 20 Oct 2026
- License restrictions
- The license prohibits copying, redistribution, sublicensing, reverse engineering, and deriving source code.checked 20 Oct 2026
- Limit: commercial use
- The lack of supported commercial licensing excludes financial planners and other business users.checked 20 Oct 2026
- Limit: model simplicity
- The official technical notes acknowledge that modeling only aggregate portfolio returns may oversimplify real portfolios.checked 20 Oct 2026
- Limit: withdrawal strategies
- An independent Bogleheads discussion reports that the planner does not explicitly implement Guyton-Klinger or VPW withdrawal strategies.checked 20 Oct 2026
- Offline operation
- The standalone planner is installed on a computer and can save plans locally for later use.checked 20 Oct 2026
- Offline use
- The standalone planner runs without an internet connection.checked 29 Sep 2026
The company
- Company and history
- Random Walk Ventures LLC created the planner in 2006; Jim Richmond is the company’s founder and president.checked 29 Sep 2026
- Company headquarters
- The license identifies Random Walk Ventures LLC as operating from New Hampshire, United States.checked 20 Oct 2026
- Founded
- 2006checked 28 Sep 2026
- Maker history
- Random Walk Ventures LLC created Flexible Retirement Planner in 2006.checked 20 Oct 2026
The full review of Flexible Retirement Planner
Overview
Flexible Retirement Planner is a retirement projection tool for people who want to explore how savings, income and spending choices affect a retirement plan. It is best suited to individuals and educators working for personal or educational purposes; financial planners and other commercial users should look elsewhere. Its simulation and scenario tools make it useful for comparing plans, though its use is expressly non-commercial.
Key features
The planner runs 10,000 Monte Carlo paths across both the accumulation and retirement-spending phases, then reports a probability of success. That gives users a way to consider a range of modeled outcomes rather than rely on one projection. It is a useful planning aid, not authorization to use the software in a commercial advisory practice.
Users can project income and savings growth, plan withdrawals, and model taxes in detail, alongside Social Security. Stable, Flexible and Conservative spending policies let users compare different approaches to retirement withdrawals. The standalone version saves inputs and supports multiple what-if scenarios, while sensitivity analysis highlights which assumptions have the most impact. That combination is valuable for exploring trade-offs, but its usefulness depends on the assumptions users enter.
The standalone planner works offline, which suits people who want to work without a connection. Windows and Mac/Linux downloads are provided, and the Windows standalone version does not require Java. For launch errors, the maker directs users to email support; it also invites questions through a support forum. The license cautions that the website may not always be available, secure or private, and does not guarantee uninterrupted or error-free use.
Pricing
Personal use: free. The free plan is for individual non-commercial use; educators and trainers may also use it free for educational purposes. A voluntary contribution of any amount unlocks a personal-use license key. The free plan is a sensible fit for personal planning and classroom use, but it does not grant commercial rights, including for financial planners.
Platforms
Flexible Retirement Planner supports Linux, macOS, web and Windows. Its standalone downloads cover Windows and Mac/Linux, with offline use available in the standalone planner. The Windows standalone version does not require Java.
Who it's for
This is a strong fit for individuals who want to compare retirement assumptions, spending policies and withdrawal plans without paying for personal use. Its educational-use allowance also suits educators and trainers. It is the wrong choice for professionals who need software they can use in a commercial planning practice.
Pros and cons
- Pros: 10,000 simulated paths cover both saving and spending, giving personal planners a richer view of modeled outcomes than a single projection.
- Pros: Scenario saving and sensitivity analysis help users compare plans and identify influential assumptions.
- Pros: Detailed tax modeling, Social Security, income, savings growth and withdrawal projections address several key parts of retirement planning.
- Pros: Free personal and educational use, plus offline standalone operation, lowers the cost and connection barriers for those audiences.
- Cons: Commercial use is not authorized or supported, ruling it out for financial planners.
- Cons: The license offers no guarantee that the website will be continuously available, secure, private, uninterrupted or error-free.
Alternatives
Retirement Planning Software is a useful next stop for readers comparing options across the category.
- ProjectionLab is worth considering if you want a web or mobile option with a free Basic plan covering forecasting, financial planning, Monte Carlo simulations, historical backtesting and flexible modeling.
- Boldin suits readers who want a free web or mobile plan with 100+ inputs, interactive explorers, charts and a limited daily allowance of AI questions.
- Retirement Budget Calculator may fit readers focused on web-based retirement budgeting and asset tracking, with a lifetime free plan and a paid monthly premium option.
- Retireator is another free retirement simulator, available on the web and Windows.
- Fidelity Planning & Guidance Center is a free web-based option; investment expenses and account transaction fees may still apply.
- T. Rowe Price Retirement Income Calculator is a free web-based alternative.
- RetireePlan is a free, open-source alternative available on the web, desktop and self-hosted platforms.
- driftcurve is a free web-based alternative.
Verdict
Choose Flexible Retirement Planner if you want free, non-commercial retirement modeling with scenario comparison, sensitivity analysis and offline standalone use. Its chief advantage is the breadth of its projections and simulated paths; its decisive limitation is that financial professionals cannot use it commercially. If you need a tool for client work, choose another option.
Getting started
- Open the planner website.
- Choose the web version or download the standalone planner for Windows, Mac, or Linux.
- For offline use, launch the standalone version after downloading it.
- Use it for personal non-commercial planning, or for educational purposes as an educator or trainer.
- A voluntary contribution of any amount unlocks a personal-use license key.
Limits worth knowing
The free plan is for individual non-commercial use, with educational use permitted for educators and trainers. Commercial use, including by financial planners, is not authorized or supported.
Questions
How much does Flexible Retirement Planner cost?
The personal-use plan is free. A voluntary contribution of any amount unlocks a personal-use license key.
Can I use the planner offline?
Yes. The standalone planner runs without an internet connection.
Which platforms are available?
The listed platforms are Linux, macOS, web, and Windows. Standalone downloads are provided for Windows and Mac/Linux.
Can financial planners use it commercially?
Commercial use is not authorized or supported, including use by financial planners.
Who created Flexible Retirement Planner?
Random Walk Ventures LLC created it in 2006. Jim Richmond is the company’s founder and president.
What does it model?
It projects income, savings growth, and withdrawals, and includes detailed tax and Social Security modeling. Monte Carlo simulation runs 10,000 paths and reports a probability of success.
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