Nestline — Financial Planning Tools for iPhone

What is Nestline?

Nestline helps you plan your financial future with a suite of on-device tools. Model investment scenarios, track your budget, and estimate federal taxes — all with clarity, simplicity, and complete privacy.

Everything runs locally on your device. No accounts, no tracking, and no data leaves your phone.

Tools

Simple Calculator

Quick investment projections with per-period contributions or withdrawals. Enter an initial amount, choose a compounding frequency, and add periods with their own duration, contribution/withdrawal mode, and growth rate.

Pro Calculator

Advanced scenarios with contribution ramps, multiple frequencies (monthly, weekly, biweekly, annual), beginning/end-of-month timing, withdrawal strategies (fixed or 4% rule), and optional inflation adjustment.

Budget

Track income, taxes, deductions, and expenses to find your monthly surplus. Categorize deductions as invested or expense, manage irregular expenses with sinking fund targets, and estimate a portfolio target using the 4% rule.

Tax Estimator

Estimate federal income tax for 2025 and 2026 with progressive bracket-by-bracket breakdowns. Supports all filing statuses, pre-tax deductions (401k, IRA, HSA), standard or itemized deductions, and child tax credits.

Key features

Math expressions in any numeric field (e.g. 500+200)
Export results to CSV from any tool
Clear growth vs. contributions charts
Runs entirely on-device — no network access
No analytics or tracking
Remembers inputs between launches
Supports light, dark, and tinted app icons

Privacy Policy

Nestline does not collect, store, transmit, or share any personal data.

All information entered into the app remains entirely on your device. Nestline does not use analytics, tracking technologies, or network services.

Because no data is collected, no data is shared with third parties.

If you have any questions about this Privacy Policy, you may contact the developer at:

Email: sauriiiin@gmail.com
Website: https://sauriiiin.github.io/

Last updated: March 2026