A free ProjectionLab alternative
CoastMath models the same lifetime plan, year by year, and its free plan includes the tax and withdrawal tools ProjectionLab lists under Premium. Bring your plan over with a ProjectionLab JSON backup.
CoastMath and ProjectionLab
| CoastMath | ProjectionLab | |
|---|---|---|
| Paid plan | $99.99/yr or $29.99/mo | Premium, $129/yr |
| Free plan includes | Every planning and analysis feature | Forecasting, Monte Carlo and historical backtesting |
| Tax estimates and tax optimization | Free | Premium |
| Roth conversions | Free | Premium |
| Withdrawal strategies | Free | Premium |
| ACA subsidies | Free | Premium |
| Estate planning | Free | Premium |
| International planning | Free | Premium |
| Multiple plans | Premium | Premium |
| Downloadable reports | Premium | Premium |
| Mobile | Native iPhone app | Web app installed to the home screen |
| Open source, self-hostable | Yes: blank-slate-labs/coastmath, free for personal use | No |
ProjectionLab details are from its pricing page on October 18, 2026.
Bring your ProjectionLab plan
Export a JSON backup from ProjectionLab (Account › Export Data) and import it into a new CoastMath plan. You review every account, income and expense before the plan is created.
Free and Premium
- Free
- Every planning and analysis feature. One plan, editable for 7 days; it keeps projecting after that.
- Premium, $99.99/yr or $29.99/mo
- Unlimited plans, always editable, Duplicate plans, Restore archived plans, CSV, PDF and JSON exports, Client workspaces.
- Self-hosted
- The open-source version runs on your own computer, free for personal use, with no plan limits.
Questions
Is CoastMath really free?
Every planning and analysis feature is free. The free plan keeps one plan, editable for 7 days from when you create it; after that it’s read-only but still projects with current tax figures. Premium ($99.99/yr or $29.99/mo) keeps plans editable and adds more plans, duplicates and downloads. The open-source version is free to run on your own computer with no plan limits.
Can I import my ProjectionLab plan?
Yes, on both tiers. CoastMath reads a ProjectionLab JSON backup. It imports household details, account balances and cost basis, salary, pension and Social Security, recurring expenses and fixed assumptions. Property, debts, withdrawal strategies and custom curves need setting up afterwards.
Will my numbers match ProjectionLab’s?
Not exactly. An import carries inputs, not results; CoastMath calculates its own growth, taxes and withdrawals, so a projection can differ even when the inputs match.
Does CoastMath have an iPhone app?
Yes. The native iPhone app and the web planner use the same account and plans. ProjectionLab is a web app you can add to the home screen.
Also compare: A free Boldin alternative