250+ iOS apps curated and reviewed
The best conversion tool apps on iPhone average 4.2β across 250+ titles β we've ranked them by what real users actually keep on their phones. Updated August 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.8β (192K) | Yes | Yes | Aug 2026 |
| 2 |  | Free | 4.8β (15K) | No | No | Aug 2026 |
| 3 |  | Free | 4.7β (15K) | Yes | Yes | Aug 2026 |
| 4 |  | Free | 2.0β (7) | No | No | Aug 2026 |
| 5 |  | Free | 5.0β (1) | Yes | No | Jul 2026 |
| 6 |  | Free | 4.7β (3) | No | No | May 2026 |
| 7 |  | Free | β | Yes | Yes | May 2026 |
| 8 |  | $4.99 | 4.5β (19) | No | No | Aug 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 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.
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 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.
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 units within various categories like length, mass, and temperature. This free application handles decimal conversions and is ad-free, offering a straightforward utility for everyday needs.
Easily convert between date/time and UNIX timestamps. Customize formats, time zones, and locations for accurate comparisons. Ideal for developers and debugging.
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 app converts various file types including video, audio, images, and documents. It also offers file management, compression/decompression, and a built-in media player. A VIP subscription unlocks full functionality.
Practice converting units of length and weight with this simple educational app. It generates random conversion tasks, perfect for children to learn and test their knowledge.
Easily convert between metric and imperial units for everyday needs. Offers a wide range of converters including currency, temperature, and length, with offline access and a favorites list for quick use.