# Coherence Tuner — Polyphonic Instrument Tuner > Polyphonic instrument tuner with advanced multi-mode display and wide frequency range. (iPhone/iPad app by Bill ONeill Design LLC.) - Source: https://appshunter.io/ios/app/coherence-tuner/id1530601625 (this page in markdown: same URL + `.md`) - Developer: [Bill ONeill Design LLC](https://appshunter.io/developer/1509780535) - Category: Music, Productivity, Music - Price: Free - Rating: 5.00/5 from 4 App Store ratings - Age rating: 4+ - Requires: iOS 13.0 · 2 MB - Languages: English - Released: 2020-10-13 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/coherence-tuner/id1530601625/reviews.md ## What is Coherence Tuner? This app uses a revolutionary tuning engine to detect and measure the pitch of multiple notes at the same time. This tuning mode uses the built-in microphone and is as accurate as any strobe tuner!  It is quick, stable, simple to use, and fully polyphonic - just start the app and strum or pluck individual strings for an instant read.  It has auto gain control, auto noise elimination, and while it allows for a couple of optimization settings to be made, is as plug-and-play as it gets! It uses an advanced multi-mode display that simultaneously shows tuning information for all strings at once in a clear and unambiguous presentation. The tuning engine operates over a wide range of frequencies - with a simple indicator for regular tuning, and a highly precise wave tuning overlay to deliver pitch perfect response - equivalent in accuracy to the best strobe tuners. In addition to the standard 6-String Guitar tuning, additional tunings include: • E Flat, D, Drop D, Double Drop D, DADGAD, Open D, Open E, Open G Stay tuned (pun intended) for future updates as we plan to add more tunings over time. Additional instrument support includes: • 7-String Guitar, Violin, Viola, Cello, 4-String Bass, 5-String Bass, 6-String Bass, Ukulele, and 5-String Banjo. The tuner is configurable to select the reference frequency for tuning in a range 435Hz to 445Hz - with a default of 440Hz. The engine can also be configured to tune using either the string Fundamental or its Second Harmonic - maximizing the range of instruments and frequencies that can be covered. (Some instruments have a stronger second harmonic than the fundamental. Additionally, instruments that operate in the bass range can often benefit from being tuned to the second harmonic. However, where possible, we recommend tuning using the fundamental as it delivers better accuracy.) How it works: Pluck strings on your instrument and the appropriate needles will respond showing coarse tuning. As you get closer to pitch, a wave overlay will automatically be displayed that shifts left or right depending on your pitch. When you reach the exact pitch, the wave is stable. Simple as that! ## Key features - Polyphonic tuning engine - Strobe tuner accuracy - Multi-mode display - Auto gain control - Auto noise elimination - Support for multiple instruments and tunings ## Frequently asked questions about Coherence Tuner ### What instruments can Coherence Tuner tune? Coherence Tuner supports a wide range of instruments including 6-string and 7-string guitars, violins, violas, cellos, 4, 5, and 6-string basses, ukuleles, and 5-string banjos. It also offers various alternate tunings for guitars. ### How accurate is Coherence Tuner? The app utilizes a revolutionary tuning engine that is as accurate as any strobe tuner. It provides precise wave tuning overlays for pitch perfect response. ### Does Coherence Tuner have ads? No, Coherence Tuner does not contain advertisements. It is a completely ad-free application. ### What is the reference frequency for Coherence Tuner? Coherence Tuner is configurable to select the reference frequency for tuning between 435Hz and 445Hz, with a default setting of 440Hz. ### Can Coherence Tuner tune to harmonics? Yes, the tuning engine can be configured to tune using either the string's fundamental or its second harmonic. Tuning to the second harmonic can be beneficial for bass instruments or those with a stronger second harmonic. ### What devices is Coherence Tuner available on? Coherence Tuner is available for iPhone, iPad, and iPod. It is rated for ages 4 and up. ### How often is Coherence Tuner updated? The latest version is 1.1, released on October 28, 2020. The developer plans to add more tunings in future updates, indicating ongoing support. ### What makes Coherence Tuner's display unique? It features an advanced multi-mode display that simultaneously shows tuning information for all strings at once. This provides a clear and unambiguous presentation of tuning data. ## Version history (last 2 releases) ### 1.1 — 2020-10-28 You spoke, and we listened - Thank You! In this version we have simplified the look of the UI to enhance readability, improved detection accuracy, and improved performance on older devices. We appreciate your input. Comments/questions: mailto:bill.oneill@billoneilldesign.com ### 1.0 — 2020-10-13 No release notes. ## Apps similar to Coherence Tuner | App | Rating | Price | Category | | --- | --- | --- | --- | | [Tuner - Guitar, Ukulele, Bass](https://appshunter.io/ios/app/tuner-guitar-ukulele-bass/id1457948103) | 4.1 (28) | Free | Music | | [Guitar Tuner & Tempo Metronome](https://appshunter.io/ios/app/guitar-tuner-and-tempo-metronome/id1475073533) | 4.3 (77) | Free | Music | | [Tuner: guitar, ukulele, bass](https://appshunter.io/ios/app/tuner-guitar-ukulele-bass/id1507738194) | 4.7 (300) | Free | Music | | [Tuner-Guitar&Ukulele&Bass](https://appshunter.io/ios/app/tuner-guitar-and-ukulele-and-bass/id1538323124) | 4.8 (118) | Free | Music | | [Guitar Tuner＋](https://appshunter.io/ios/app/guitar-tuner/id1553432239) | 4.7 (1,621) | Free | Music | | [Tuner PRO: guitar,ukulele,bass](https://appshunter.io/ios/app/tuner-pro-guitarukulelebass/id1509460145) | 4.3 (19) | Free | Music | ## More apps by Bill ONeill Design LLC - [BrainwaveZ](https://appshunter.io/ios/app/brainwavez/id1509780536) - [Key?](https://appshunter.io/ios/app/key/id1535806085) - [BinauralZ](https://appshunter.io/ios/app/binauralz/id1554760084) All apps by Bill ONeill Design LLC: https://appshunter.io/developer/1509780535 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*