217+ iOS apps curated and reviewed
The best conversion tool apps on iPhone average 4.6★ across 217+ titles — we've ranked them by what real users actually keep on their phones. Updated July 2026.
Easily convert between a wide range of units across 20 categories, including length, weight, temperature, and more. Features live currency updates for 155 world currencies, refreshed daily. Designed for simplicity and visual appeal.
This app provides a comprehensive unit and currency converter with a user-friendly interface. It offers offline functionality, supports over 30,000 unit conversions, and includes more than 160 currencies with live exchange rates. Users can save favorite conversions and get precise results.
This app is a versatile unit and currency converter with a user-friendly interface. It supports a wide range of conversion categories, including real-world and crypto currencies, with automatic exchange rate updates. Customize your experience with design options, dark mode, and adjustable home screen layouts.
This app offers a comprehensive unit conversion tool with over 300 units across 27 categories. It supports compound units, date calculations, and conversions between various number systems, including historical units. The interface is designed for ease of use with smart keyboards and customizable display options.
This utility app allows users to convert a wide range of file types, including documents, music, eBooks, and images. It supports numerous target formats and offers advanced options like PDF password protection and metadata removal from images.
Quickly convert between thousands of units with an intelligent search and autocomplete feature. This app offers a streamlined interface, an integrated calculator, and the ability to save favorite conversions. It supports over 6,400 units across 51 categories, making it a comprehensive tool for all your conversion needs.
Instantly convert over 200 units across 20 measurement categories, from weight and length to temperature and data storage. This tool simplifies metric and Imperial conversions for STEM professionals and everyday users alike.
Easily convert between various units of measurement including length, weight, temperature, and currency. Features automatic currency updates, a vast selection of currencies, and customizable display options for accuracy and rounding. Optimized for multitasking on iPad and offers a beautiful dark design.
This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.
This app provides engineers and operations personnel with tools to calculate the volume of vertical tanks of various shapes and top/bottom styles. It also includes multiple conversion tools for common measurements and a browser for product information.
Easily convert between 76 measurement units across eight common types, including length, weight, temperature, and volume. Features a built-in calculator and optional currency conversion with daily exchange rate updates.
This app offers a comprehensive unit and hardness conversion tool with an easy-to-use interface. It includes currency conversion with updated exchange rates, over 300 engineering and scientific units, and a specialized hardness converter. Additional features like timezone conversion, pace calculation, and a standard calculator enhance its utility.
Effortlessly convert between hundreds of units across 26 essential categories with this precision calculator. Designed for speed and simplicity, it offers accurate results in seconds for students, professionals, and travelers alike. Enjoy offline functionality and a customizable experience.
This app offers a powerful and user-friendly unit converter with 16 categories, including currency, length, and temperature. It allows for custom unit lists and provides live exchange rate updates for 148 currencies. Unlock all features with a one-time in-app purchase.
Easily convert between dates, times, and UNIX timestamps. Customize date and time formats, and set time zones and locations to check international time differences. Ideal for application development and debugging.
This app offers a comprehensive suite of tools for multimedia and file management. It allows for format conversion, editing, and batch processing of photos, GIFs, videos, audio, PDFs, and archives. Features include network data retrieval, automatic snapshot collection, and local privacy protection.
Easily convert images into high-quality PDFs with this offline tool. It offers unlimited conversions, file size display, and sharing options. Customize your PDFs with page numbering, borders, and renaming capabilities.
This veterinary reference tool helps find equivalent SutureVet™ product codes for existing suture brands. It allows quick cross-indexing of products from seven different manufacturers, saving time for veterinary professionals and sales representatives.
Easily convert between a wide range of units for everyday tasks. Quickly change units with a simple scroll interface. Supports common measurements like length, weight, temperature, and more.