Best 399/90 Apps

Intended for use with TI-84

4.7😞(1.7M ratings)

FreeAdsIn-App Purchases

#87in Utilities

This app offers a comprehensive suite of calculation tools, including basic, scientific, and unit conversion functions. It features an AI-powered math solver that can solve problems from photos and a dedicated math notes section for jotting down equations and diagrams. Accessibility options like dynamic text size and VoiceOver support are also included.

What We Love

💻 Useful calculator features
🎨 Customizable backgrounds and themes
📚 Helpful history tracking

Room to Improve

📺 Intrusive full-screen ads
💰 Expensive subscription model
🔍 Ads blocking calculator functionality

Loan Calculator‰ by Tim O's Studios, LLC

Simple Loan Calculator

Strong Contender

💰 Finance

4.9😊(105K ratings)

FreeAds

Easily calculate loan or mortgage payments. Simply input the loan amount, repayment term, and interest rate to get your estimated monthly payment.

What We Love

👍 Simple and easy to use
🚀 Straightforward and intuitive
💡 Accurate loan repayment calculations
🚀 Instant results
👍 Helpful for financial decisions

Room to Improve

🐛 Incorrect interest calculations
🔍 Limited functionality
💸 Excessive advertisements
🔍 Cannot switch to landscape mode
🔒 Privacy concerns with data collection

Fraction Calculator by xNeat.com

Decimal Plus Units Converter

Worth Considering

📊 Productivity

4.7😐(157 ratings)

FreeIn-App Purchases

This tool converts between decimals and fractions, and also handles unit conversions for construction and metric measurements. It offers an intuitive interface for calculations and editing, with advanced features available through upgrades.

What We Love

👍 Intuitive and easy-to-use interface
🚀 Fast calculation performance
💡 Excellent for woodworking and construction projects
🎨 Clean, customizable design with multiple themes
📐 Handles fractions beautifully with imperial measurements
⚡ No ads or annoying popups
🔄 Useful backspace function for tweaking calculations
⌚ Available on Apple Watch
🎓 Great educational tool for learning fractions
💾 Minimal storage footprint

Room to Improve

💰 Extremely expensive subscription model
🔐 Paywall blocks most useful features in free version
😞 Recent update changed from free to paid model
🎯 Unclear which features require payment
🖱️ Small buttons prone to accidental clicks
📱 Poor Apple Watch support for fractions
❌ Bait-and-switch monetization strategy
🔄 Confusing fraction input method for some users
⚠️ App functionality degraded in recent updates

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Reliable Exchange Rates

Convert 300+ currencies, metals, cryptocurrenciesReal-time exchange ratesReliable OANDA Rates

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Basic and scientific calculatorPhoto math solverAI homework helper

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subscription

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Over 40 calculators and unit convertersStandard and scientific calculator functionsFinancial calculators (interest, loan, currency)

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Graphing Calculator for TI-84

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Homework Helper & AI Tutor

Camera-based problem solvingStep-by-step solutionsHandwritten and printed math recognition

Solve math problems instantly by taking a photo or entering an equation. Get step-by-step solutions to understand the process and improve your math skills. Covers a wide range of topics from basic arithmetic to calculus.

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No ads & Scientific calculator

Ad-free experienceCalculation historyVisual input

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Measurements & Calculations

Real-time currency conversionsExtensive unit categories (weight, temp, length, volume, etc.)Simple and intuitive interface

Easily convert between various units of measurement, including currencies, temperature, length, and weight. This intuitive tool provides real-time currency exchange rates and a comprehensive list of conversions for everyday use.

✈️ Travel

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