226+ iOS apps curated and reviewed
Out of 226+ db killer calculator apps on iOS, 16 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | May 2026 |
| 2 |  | $5.99 | 4.7★ (6.3K) | No | Yes | Aug 2026 |
| 3 |  | Free | 4.7★ (12K) | Yes | Yes | Aug 2026 |
| 4 |  | Free | 4.8★ (39K) | No | Yes | Aug 2026 |
| 5 |  | Free | 4.6★ (36K) | No | Yes | Aug 2026 |
| 6 |  | Free | 4.3★ (294) | Yes | Yes | Aug 2026 |
| 7 |  | Free | 4.7★ (160K) | No | Yes | Aug 2026 |
| 8 |  | Free | 4.7★ (4.8K) | Yes | Yes | Aug 2026 |
This advanced calculator app offers a powerful math core and algebra engine for basic to complex calculations. It includes features like step-by-step solutions, handwriting recognition, and 2D graphing, making it suitable for students, engineers, and programmers.
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 is a powerful construction calculator designed for professionals working with dimensions. It offers a wide range of solutions for dimensional math, right angle calculations, area and volume, and special functions, helping to improve speed and accuracy in layouts, bids, and estimates.
Transform your device into a professional sound level meter and audio analyzer. Measure ambient noise, monitor decibel levels, and visualize sound frequencies in real time. It also offers advanced sleep tracking with sound recognition to identify disruptions.
Transform your device into a professional decibel meter to measure and track sound levels in real-time. Save measurements, view history charts, and set custom alerts for excessive noise. Useful for documenting sound exposure or identifying noise sources.
This app transforms your device into a professional sound level meter, precisely measuring ambient noise pressure. It offers advanced features like frequency analysis, historical data management, and dosimeter functions, making it useful for various applications and entertainment.
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 calculates the correct fusion pressure for HDPE and Polypropylene pipe jobs. It simplifies the process by selecting your fusion machine and entering pipe details to determine the recommended theoretical gauge pressure.
Measure, record, and analyze sound levels in your environment. This app offers precision metering, noise elimination tools, hearing protection features, and home audio calibration. It provides detailed reports and can be used with device microphones or external ones.
This app provides a powerful scientific calculator with step-by-step solutions for equations, advanced functions, and graphing capabilities. It includes a formula library and unit converter, inspired by a popular Casio model, to aid in learning and problem-solving for math and science subjects.
This app calculates long-range ballistics to improve shooting accuracy. It accounts for environmental factors like wind, pressure, and temperature, and offers advanced features for specific scope models.
This app provides precise external ballistics calculations for shooting enthusiasts. It allows users to store firearm and ammunition profiles, integrate weather data, and apply advanced corrections for accurate trajectory solutions in various environments.
This app provides a comprehensive suite of audio engineering calculators for musicians and producers. It offers free tools for length, pitch, timecode, electric, acoustics, and file size calculations, with an optional Pro tier for advanced features like LUFS targeting and batch conversion.
Measure and track sound levels in real-time with this user-friendly decibel meter. Log historical data, integrate with Apple Health, and gain insights into your sound environment. Includes a white noise generator for focused listening.
This app provides a comprehensive suite of calculators and tools for CNC machinists, engineers, and hobbyists. It offers specialized calculations for turning, milling, drilling, threading, and geometric tolerances, along with material data and G-code generation.
Transform your smartphone into a professional car diagnostic tool. Read and clear engine fault codes, monitor real-time sensor data, and perform advanced diagnostics without a mechanic. Supports a wide range of OBD2 compliant vehicles.
This application simplifies the process of calculating DMX dip switch settings for lighting equipment. It helps users easily address devices and generate a patch list, eliminating manual counting.
Turn your smartphone into a powerful vehicle monitoring and diagnostic tool. Track engine performance, fuel economy, and instantly diagnose check engine lights. Features advanced dashboards for performance analysis and off-roading.
This app simplifies concrete volume calculations for professionals and DIYers. It offers flexible unit support and a free rectangular slab calculator, with advanced features available via subscription.