Terms of use

Updated October 13, 2026

Using Highthree

Highthree is an independent pension estimator for US federal employees under FERS and CSRS. By using the app you agree to these terms.

Estimates only

Results are estimates. They are not official calculations and they are not legal or financial advice. Verify your numbers with your agency HR office and OPM before you make decisions.

Pro purchase

Pro is a one-time purchase handled by Apple through the App Store. It is not a subscription. Payments, refunds and restoring a purchase follow Apple's rules.

Apple standard EULA

Apple's standard End User License Agreement applies to your use of the app.

No warranty

The app is provided as is. To the extent the law allows, there is no warranty of any kind, and the maker is not liable for decisions made from the estimates.

Contact

Sang Huynh Xuan, sangmicheal911@gmail.com