Integrate your performance tuner with your smartphone to adjust engine maps, view real-time data, and manage system settings. This app requires a specific Bluetooth adapter for full functionality.




216+ iOS apps curated and reviewed
The best jb4 tuner apps on iPhone average 4.2★ across 216+ titles — we've ranked them by what real users actually keep on their phones. Updated June 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | Free | 4.4★ (14) | No | No | Jul 2026 | |
| 2 | $27.99 | 3.8★ (234) | No | No | Jul 2026 | |
| 3 | Free | 4.6★ (2.5K) | No | Yes | Jul 2026 | |
| 4 | Free | 4.2★ (2.2K) | No | No | Jul 2026 | |
| 5 | Free | 4.5★ (45K) | No | Yes | Jul 2026 | |
| 6 | Free | 3.1★ (61) | No | No | May 2026 | |
| 7 | Free | 4.2★ (46) | — | No | May 2026 | |
| 8 | Free | 3.9★ (247) | Yes | No | Jul 2026 |




Integrate your performance tuner with your smartphone to adjust engine maps, view real-time data, and manage system settings. This app requires a specific Bluetooth adapter for full functionality.






This app acts as a mobile data logger and display for vehicles equipped with a JB4 tuner. It allows users to monitor and log various engine parameters, view data in real-time, and adjust settings for performance tuning.






This app acts as a musical fitness coach, offering a chromatic tuner and metronome with detailed analytics. It helps users improve their playing or singing by charting progress and providing insights. Record, playback, and analyze performances with a live tuner view.


This app offers a simple and accurate way to tune string instruments like violins, violas, and cellos. It provides step-by-step instructions and a strong noise filter, making it ideal for beginners and those new to music.


Achieve perfect guitar tuning quickly with an AI-powered chromatic tuner. Learn chords, practice with metronome features, and play songs with chord and lyric generation. Suitable for all skill levels.


Easily tune your bass guitar with this straightforward application. It offers a quick and user-friendly experience for musicians of all levels.


This app offers a comprehensive music toolkit, combining a highly accurate tuner, a precise metronome, and a tone generator into a single, easy-to-use interface. It's designed for musicians of all skill levels to enhance practice and performance with smart, customizable settings.


This utility app provides accurate tuning notes for the cello, covering the standard C, G, D, and A strings. It's designed to help musicians quickly and easily achieve the correct pitch for their instrument.


This application provides a professional and accurate way to tune your ukulele using your iPhone's microphone. It analyzes the sound in real-time, indicating whether a note is sharp or flat for quick adjustments.


This app is a highly accurate chromatic tuner and tone generator for a wide range of musical instruments. It offers multiple tuning modes, advanced DSP for precision, and features like historical temperaments and transpositions. It also functions as an electronic pitch pipe.


This application listens to your instrument's sound and displays the pitch, allowing for accurate tuning by showing the deviation from the target note. It supports a wide range of instruments and offers extensive customization options for precise tuning.


This chromatic tuner is designed for a wide range of instruments, with a special optimization for low frequencies. Its accurate and responsive interface makes tuning easy for musicians.


This app helps you tune your stringed instruments with ease. Play a string and see if it's sharp, flat, or in tune. It offers preset tunings and the ability to tune to any note, supporting a wide variety of instruments.


This application provides a highly accurate chromatic tuner for any instrument. It features advanced noise cancellation and a detailed fine-tuning display, ensuring precise pitch readings for musicians of all levels. The tuner offers a fast refresh rate and works with any note.


This app offers a professional-grade strobe tuner for guitars, providing fast and accurate tuning with responsive visual displays. It features multi-strobe mode for simultaneous string tuning and works effectively even in noisy environments.


This application provides an intuitive and precise way to tune your guitar using your device's microphone. It offers visual feedback for accurate tuning and supports a wide range of custom tunings, along with adjustable reference frequencies.


Tune a wide range of string instruments with an intuitive interface. Explore preset tunings, create custom ones, and get the perfect sound. It also integrates with smart tuning devices for enhanced control and updates.


This app provides precise chromatic tuning for a wide range of instruments using your device's microphone. It features a unique note wheel interface and a responsive fine-tuning meter for accurate pitch detection. Advanced options include custom temperaments, transposition, and adjustable calibration for professional use.


This app offers precise tuning for low-frequency instruments like bass guitars, cellos, and bassoons. It features advanced algorithms to accurately detect deep pitches, providing real-time feedback and a visual pitch graph for optimal tuning.


This app provides fast and accurate tuning for acoustic guitars. It displays exact pitch frequencies, offers a visual LED indicator, and automatically highlights tuned strings. It includes standard and common alternate tunings, with advanced settings available via in-app purchase.