205+ iOS apps curated and reviewed
DiaMeter is the household name in diameter, but it's far from the only option. We track 205+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.7★ (7) | No | Yes | Aug 2026 |
| 2 |  | Free | 4.5★ (6.7K) | Yes | Yes | Aug 2026 |
| 3 |  | Free | — | No | No | May 2026 |
| 4 |  | Free | 4.1★ (22) | No | Yes | May 2026 |
| 5 |  | Free | 4.6★ (5) | No | Yes | Aug 2026 |
| 6 |  | Free | 3.5★ (11) | Yes | No | May 2026 |
| 7 |  | Free | 3.9★ (94) | No | Yes | Aug 2026 |
| 8 |  | Free | — | No | No | May 2026 |
This app helps manage diabetes by tracking blood sugar, insulin doses, and carbohydrate intake. It provides clear statistics and reminders to help users achieve better control over their condition. Features include a bread unit calculator and educational articles.
Easily determine your ring size across multiple countries using metric or imperial units. Features visual guides and supports various international sizing standards. Share your size and explore a jewelry catalog.
This utility app provides a straightforward way to calculate circle properties. Simply input one known value (radius, diameter, circumference, or area) to instantly get the results for the others. It's designed for quick and no-fuss calculations.
This utility app transforms your iPhone or iPad into a precise measuring tool for short lengths. It supports both inch and centimeter units, features calibration, and offers a user-friendly interface.
This app calculates the minimum internal pipe diameter required for a specific flow rate and maximum pressure loss. It offers comprehensive results, customizable databases for materials and fluids, and generates professional reports.
This utility app uses your phone's camera and augmented reality to take quick measurements of linear sizes, distances, angles, perimeters, and areas. It supports various units and allows you to save and share your measurements.
Measure tree height, diameter, crown shape, and more using augmented reality on your iPhone. This app provides accurate, documented field measurements without requiring extra equipment. It's designed for professionals and nature enthusiasts alike.
This app turns your device into a versatile ruler and tape measure using advanced AR technology. It offers precise measurements for objects, rooms, and complex shapes, along with unit conversion and a history log. Ideal for professionals and everyday users needing accurate measurements.
Transform your device into a digital tape measure. Quickly gauge the size of real-world objects, determine a person's height, and automatically get dimensions for rectangular items. Save and share your measurements easily.
This utility app calculates the minimum internal pipe diameter for gas flow based on flow rate and pressure loss. It supports various calculation equations and offers comprehensive results with customizable units and databases for materials, fluids, and fittings.
Effortlessly measure rings, jewelry, and other objects with precision using visual cues and a digital ruler. Supports global sizing standards and stores measurement history for convenience. Ensures a perfect fit for your precious items.
This app functions as a digital measuring tool, allowing you to measure objects and distances with accuracy. It also enables you to create sketches with text annotations and share your measurements and designs.
Accurately determine your ring size using your phone's camera and screen. Offers four easy methods, including AR measurement and on-screen guides. Includes a comprehensive size chart for multiple regional standards.
Transform your device into a versatile digital toolkit for precise measurements. Create 2D and 3D floor plans, scan rooms, and measure distances with advanced AI and computer vision. Ideal for DIY projects, home renovations, and professional use.
This app transforms your device into a versatile measuring tool. It allows for precise measurements of length, area, diameter, and angles using the touchscreen. Easily split objects into equal parts and switch between millimeters and inches for your convenience.
This utility app provides a portable ruler for on-the-go measurements. It also includes a suite of additional tools like a protractor, spirit level, and various meters for diverse measurement needs.
This app provides a versatile toolkit for all your measurement needs. It includes a classic ruler, a tape measure, and a camera ruler for precise measurements. Easily switch between units and document your findings by adding measurements directly to photos.
Measure objects and distances with an on-screen ruler and augmented reality. Supports inches and centimeters, with features for linear sizes, angles, area, volume, and more. Save your measurements for later use.