221+ iOS apps curated and reviewed
The best geothermal calculator apps on iPhone average 4.6★ across 221+ titles — we've ranked them by what real users actually keep on their phones. Updated July 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | $2.99 | — | No | No | May 2026 |
| 2 |  | Free | 4.9★ (404K) | Yes | No | Jul 2026 |
| 3 |  | Free | 4.5★ (126K) | Yes | Yes | Jul 2026 |
| 4 |  | Free | 4.3★ (6) | No | No | Jul 2026 |
| 5 |  | Free | 4.7★ (12K) | Yes | Yes | Jul 2026 |
| 6 |  | Free | 4.7★ (12K) | Yes | Yes | Jul 2026 |
| 7 |  | Free | 4.6★ (4.8K) | Yes | No | Jul 2026 |
| 8 |  | $0.99 | 4.8★ (4.2K) | No | Yes | Jul 2026 |
This utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.
This app offers both basic and advanced scientific calculations with an intuitive interface designed for tablets and phones. It includes features like currency conversion, calculation history, and the ability to share results. An optional premium membership removes ads and provides enhanced support.
This audio guide app leads you through an exhibition about geothermal energy. Navigate the exhibition using an interactive map and listen to audio stops that correspond to your location. Explore Iceland's geothermal sector through displays, interactive exhibits, and videos.
This comprehensive calculator app offers a wide range of tools for everyday calculations, from basic arithmetic and scientific functions to unit and currency conversions. It includes specialized calculators for loans, health, fuel costs, GPA, and more, all within a clean and user-friendly interface.
This app is a powerful scientific calculator with graphing capabilities, a formula library, and a unit converter. It offers natural display input, advanced math functions for algebra, calculus, and statistics, and supports various number bases and formats.
This app offers a comprehensive suite of over 40 calculators and unit converters for various needs, including finance, health, construction, and everyday math. It features standard, scientific, and specialized calculators for tasks like loan amortization, currency conversion, and material estimation.
This app offers a versatile calculator experience with both standard and scientific modes. Customize its appearance, use it in any orientation, and access additional tools like a notes tab and calculation history. It's designed for students and professionals needing accurate calculations.
This app offers a clean and intuitive interface for both basic arithmetic and advanced scientific calculations. It includes a history tape to review past computations and supports various mathematical operations, making it suitable for everyday use and complex problem-solving.
Easily estimate the quantity of various landscaping and hardscaping materials like gravel, stone, and sand. Get precise measurements in tons, cubic yards, or cubic meters for your projects.
This app functions as a scientific calculator, enabling users to input and edit complex formulas with ease. It supports formula history, variable memory, and various number system conversions for accurate calculations.
This app offers a versatile calculator with three distinct modes: Basic, Scientific, and Programmer. It provides a history view, sharing capabilities, and supports various input and output formats. The app is designed for iPhone, iPad, and iPod Touch.
A powerful construction calculator designed for tradespeople. It offers a wide range of tools for estimating, layout, framing, and jobsite calculations, helping to save time and improve accuracy. Supports both imperial and metric units.
A user-friendly calculator app featuring large buttons and customizable colorful backgrounds. It offers a dual-line display, multi-line input for complex equations, and convenient gesture controls for editing and copying.
This free scientific calculator offers essential features like RPN mode, unit conversions, and multiple undo/redo. It provides a taste of a more powerful version, with optional in-app purchases for expanded functionality.
Easily estimate the volume of soil, topsoil, dirt, and landscaping materials needed for any project. Supports various area shapes and multiple measurement units, providing results in multiple volume and weight formats, including the number of bags.
This is a straightforward calculator application designed for ease of use and clear readability. Users can personalize the app's appearance by choosing their preferred background and display themes.
A powerful calculator designed for professionals and students, offering advanced features like RPN mode, multi-line display, and extensive unit conversions. It supports various number systems and includes an Apple Watch app for on-the-go calculations.
This app simplifies complex measurements and fraction calculations. Convert between various units, perform addition and subtraction of measurements, and work with feet-inches and fractional inches. It also includes a full fraction calculator with advanced functions and a history tape.
This app offers a comprehensive suite of 10 powerful calculators and 10 financial worksheets, designed to handle everything from basic arithmetic to complex scientific and financial calculations. It includes features like unit conversion, currency exchange, graphing, and statistical analysis, making it a versatile tool for students and professionals.