Seraph: Retirement Planner

Seraph: Retirement Planner

Monte Carlo Money Simulator

6 ratings
3 reviews
Free

Details

  • Released
  • Updated
  • July 20, 2026
  • August 17, 2026

Features

Seraph: Retirement Planner video #1 for iPhone
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Seraph: Retirement Planner screenshot #8 for iPhone
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Seraph: Retirement Planner screenshot #10 for iPhone
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About

This app simulates thousands of market futures and lifespans to estimate your chance of financial solvency in retirement. It models income, expenses, accounts, debt, and life events with a real US tax engine. Understand key insights and track your progress against your plan.

Monte Carlo retirement simulations
Comprehensive financial modeling
Real US tax engine
Couples planning
Social Security optimization
Healthcare cost projection
Life event scenario planning
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+2

What's New in Seraph

1.58

August 17, 2026

Fixed a bug related to deleting a life event. Improved state tax handling: Maryland and Indiana now include typical county income taxes, and new picker options add resident taxes for Yonkers, New York and Portland, Oregon.

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User reviews

95%

This app fills a gap left by many calculators. Demonstrates the impact of many planning decisions in clear way. You can learn strategies available to you by playing around and comparing scenarios. Don’t know whether to covert to Roth or when to start, just run a comparison. Want to know if moving to smaller home can help, run a comparison.

It includes models of things that are enormously difficult to estimate like home insurance costs, property taxes, medical bills, Medicare income penalties.

It crashes when I try to delete a life event.

It would be even better with:

1. 401k multiple matching levels.

2 HSA, spending strategies: pay medical expense first, or use medical receipt banking to create a tax advantaged emergency fund..

3 Finer granularity on how excess money gets invested. Do I up my my 401k? Roth or pre tax? And so on. Can I save cash until HSA + cash = minimum emergency value, or just cash, and then do Roth conversions?
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Response from developer

Wow thank you for the detailed feedback. Got lucky that I was nearing the next big release and I was able to fit in critical items from this list (including delete buttons in addition to swipe to deletes that I had before). New version is live, please update!

Very helpful!

Very useful for scenario planning and understanding how different changes can impact what finances look like later on.

Awesome app - recommend!

Just tried this new app, it’s a surprisingly realistic projection of my finances. Will be recommending to my friends.

Developer apps

FAQ

What is HailCat's core function?

HailCat is a retirement planning tool that uses Monte Carlo simulations to estimate your probability of financial solvency. It models various financial aspects and market futures to provide an honest outlook on your retirement plan.

How does HailCat handle taxes?

The app features a real 2026 US tax engine, including federal and all 50 state taxes, capital gains, NIIT, RMDs, and payroll taxes. It also models the tax implications of Social Security benefits and Roth conversions.

Is HailCat suitable for couples?

Yes, HailCat supports couples planning with features like dual lifespans, survivor benefits, spousal rollovers, and tax changes based on filing status.

Does HailCat include Social Security planning?

Yes, HailCat incorporates real Social Security claim age math (62 to 70), cost of living increases, survivor rules, and the actual taxation of benefits.

How does HailCat model market returns?

Instead of a single straight-line return, HailCat uses a multi-asset market model that includes US and international stocks, bonds, REITs, and cash for more realistic simulations.

Is HailCat free to use?

HailCat is currently free for early adopters. While advanced features may move to a subscription later, early users receive full access. The app is rated 5.0 stars from 2 ratings.

Does HailCat have ads?

No, HailCat is ad-free. The app is designed with privacy in mind, and no advertisements are present.

What devices does HailCat support?

HailCat is available on iPhone and iPad, supporting iOS devices.