250+ iOS apps curated and reviewed
The best decimal reader apps on iPhone average 4.7★ across 250+ titles — 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 | 4.7★ (54K) | No | Yes | Aug 2026 |
| 2 |  | Free | 4.6★ (161K) | No | Yes | Aug 2026 |
| 3 |  | Free | 4.5★ (3.1K) | Yes | No | Aug 2026 |
| 4 |  | Free | 4.0★ (5) | No | Yes | Aug 2026 |
| 5 |  | Free | 5.0★ (1) | No | No | May 2026 |
| 6 |  | $0.99 | — | No | No | Jul 2026 |
| 7 |  | Free | 4.7★ (9K) | No | No | Aug 2026 |
| 8 |  | Free | — | Yes | Yes | Aug 2026 |
Monitor your surroundings with this decibel meter app. It measures sound levels in real-time, providing clear visual analysis and advanced filtering options. Easily share your readings for documentation or further analysis.
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 application measures and displays environmental noise levels in decibels. It offers various visual representations of the data, including gauges, graphs, and numerical readouts. Users can also save their measurement history.
Access your entire book collection from various sources in one beautiful app. Enjoy a customizable reading experience with synced progress, bookmarks, and highlights across devices. Organize your library with series info, search, and collections.
This calculator utilizes Reverse Polish Notation (RPN) for input, mirroring the functionality of classic HP calculators. It features a four-level stack with X, Y, Z, and T registers, displaying the X register in decimal, hexadecimal, and binary.
This application allows users to download and read PDF documents and audiobooks. It offers a simple and free experience for accessing digital content on mobile devices.
Easily convert numbers between binary, decimal, and hexadecimal formats. Select your input type and instantly see the converted values in the other two systems. A straightforward tool for quick number base conversions.
This app offers a streamlined PDF reading experience with an iBooks-inspired interface. It provides features like recent reading history, page cropping for larger content views, and an outline for easy navigation. Zooming is simplified with double-tap gestures.
Organize all your ebooks, comics, and manga in a single app. Customize your reading experience with adjustable text, fonts, and themes. Listen to audiobooks and zoom into visual content with ease.
Easily convert numbers between binary, decimal, hexadecimal, and octal systems. This app is ideal for programmers, computer science students, and anyone interested in number systems, streamlining complex calculations with a few taps.
This calculator performs calculations with arbitrary precision, avoiding rounding errors common in standard calculators. It provides an extensive scientific keypad and can display an unlimited number of digits for exact results.
This utility app reads and verifies NFC chips in e-Passports. It uses either your phone's NFC or an external reader, comparing optically captured or manually entered data to display biometric information and document validity. All data is kept only in device memory and deleted upon closing.
Manage all your documents digitally in one place on your mobile device. This app allows you to view and save various file types, including PDFs, Word, PowerPoint, Excel, text, and zip files, without needing separate applications.
Scan documents in high definition, convert them to various formats like Word and PDF, and extract text from images. This app helps manage and archive all types of documents efficiently.
This app offers both basic and scientific calculation modes, supporting a wide range of operations including trigonometry and logarithms. It features a clear expression display, customizable themes, and haptic feedback for an enhanced user experience.
This app simplifies paper calculations for professionals. It offers tools to quickly determine paper sizes, weights, thickness, and perform various conversions on the go.
