InterestLab
Mortgage, loans & savings
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
InterestLab is a financial calculator toolkit for everyday money decisions — from mortgages and loan payoffs to savings, interest rates, and dates. Fully offline.
InterestLab is a complete financial calculator toolkit for everyday money decisions — from mortgages and loan payoffs to savings, interest rates, and dates. Clean, fast, and fully offline.
Whether you're comparing a home loan, planning to pay off a credit card faster, or projecting how your savings will grow, InterestLab gives you clear numbers, helpful charts, and a shareable PDF — all in seconds.
WHAT YOU CAN DO
. Mortgage — Enter the home price, down payment, rate, and term to see your monthly principal & interest, total interest, payoff date, a balance-over-time chart, and a full amortization schedule you can export as a PDF.
. Loan Payoff — See how long until a balance is paid off and how much interest you'll pay. Add an extra monthly amount to see the time and interest you'd save.
. APR ↔ APY — Convert between the nominal (APR) and effective (APY) annual rate for any compounding frequency — the fast way to compare loan and savings offers.
. Savings with Deposits — Project growth with recurring monthly deposits, an optional yearly deposit increase, and inflation. Watch it build with a growth curve and an invested-vs-earnings breakdown.
. Fixed Income — Model a lump-sum investment over days, months, or years, with inflation-adjusted results.
. Loan Rate Finder — Discover the true interest rate hidden in a set of fixed payments — perfect for comparing financing offers.
. Variable Income — Track gains and losses on any asset from purchase to sale, with daily, monthly, and annual rates.
. Gains (Run-up) & Losses (Drawdown) — Understand the percentage needed to recover a loss, or given back after a gain.
. Equivalent Rates & Stated Rate — Convert rates between periods and work with stated/effective rates (SAR / ER).
. Dates — Days between two dates (calendar and business days), add or subtract time, and track ages, events, and anniversaries.
. History — Save any calculation, search your records, and export or share results as a clean PDF.
BUILT FOR PRIVACY
InterestLab works fully offline. There are no accounts, no sign-in, no ads, and no tracking. Everything you calculate and save stays on your device — we never see your data.
SIMPLE, POLISHED, FAST
A tidy home screen, native charts, haptic feedback, Dark Mode, and Dynamic Type support make InterestLab a pleasure to use on any iPhone.
PREMIUM (OPTIONAL)
The free version covers everyday calculations. A single one-time purchase unlocks unlimited terms for long-range projections — no subscription, ever.
Disclaimer: InterestLab provides estimates for informational purposes only and is not financial, tax, or legal advice. Always verify results and consult a professional before making financial decisions.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Enhanced user interface with improved usability.
The developer, Gilberto Jose de Nazare, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Gilberto Jose de Nazare
- Size
- 4.8 MB
- Category
- Finance
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- InterestLab Premium $2.99
- Copyright
- © Glassy Apps