# iontuner — The honest instrument tuner > The honest instrument tuner (iPhone/iPad app by Seth Adam Mundall.) - Source: https://appshunter.io/ios/app/iontuner/id6767259524 (this page in markdown: same URL + `.md`) - Developer: [Seth Adam Mundall](https://appshunter.io/developer/1626079549) - Category: Music, Utilities - Price: Free - Age rating: 4+ - Requires: iOS 17.6 · 2 MB - Languages: Arabic, English, French, German, Japanese, Korean, Portuguese, Russian, Chinese, Spanish - Released: 2026-05-07 - Data updated: 2026-06-25 - User reviews in markdown: https://appshunter.io/ios/app/iontuner/id6767259524/reviews.md ## What is iontuner? The honest tuner. Free, no ads, no subscriptions, no sign-up, no data collection. iontuner does one thing well: it helps you tune your instrument quickly and accurately. Open the app, pick your instrument, play a string, watch the needle. That's it. INSTRUMENTS Built for guitar, 12-string guitar, bass, double bass, ukulele, violin, viola, cello, mandolin, banjo, piano, and chromatic mode. Tap "Show world instruments" to access oud, saz, charango, cuatro (Venezuelan and Puerto Rican), tres cubano, bouzouki (Greek and Irish), balalaika, erhu, and pipa — with proper regional tuning traditions for each. 40+ TUNINGS Standard, Drop D, DADGAD, Open G, Half Step Down, and dozens more. Five double bass tunings including the historical Viennese tuning. Multiple regional traditions for oud (Arabic, Iraqi, Turkish, Egyptian) and bouzouki (tetrachordo, trichordo, Irish). Star your favorites for quick access. FIVE CONCERT A PITCHES 440 Hz (Standard), 442 Hz (Orchestral), 432 Hz (Alternative), 430 Hz (Classical), and 415 Hz (Baroque). For period instrument musicians, modern orchestras, and everyone in between. SUB-CENT PRECISION Standard mode hits ±1 cent accuracy for everyday tuning. Pro mode goes sub-cent for piano tuning, double bass low octave, and reference work. CUSTOM TUNINGS Build your own tunings string by string. Save unlimited custom presets. Frequencies update automatically when you change Concert A. REFERENCE TONES Play a clean reference pitch for each string. Tap, tune by ear, tap to stop. DESIGNED FOR YOUR INSTRUMENT Each instrument has its own detection profile — buffer sizes, filter cutoffs, and harmonic correction tuned for what you're actually playing. Bowed strings get extra smoothing. Bass instruments get expanded low-frequency analysis. Double bass detection reaches down to B0 (30.9 Hz). WHAT YOU WON'T FIND No ads. No subscriptions. No in-app purchases. No "premium tier." No data collection. No analytics. No account creation. No paywall after seven free uses. No "unlock with rating." Nothing tracking you, ever. 10 LANGUAGES English, Spanish, Portuguese, French, German, Italian, Russian, Arabic, Chinese (Simplified), Japanese, and Korean. iPad AND iPHONE Designed for both. iPad gets a sidebar layout that keeps everything visible. PRIVACY Audio is analyzed entirely on your device. Nothing leaves your phone. Ever. Built by a solo developer who got tired of tuner apps full of ads and paywalls. iontuner is what a tuner app should be. Open the app. Tune your instrument. Close the app. Make music. ## Version history (last 3 releases) ### 2.5.0 — 2026-06-17 Your most stable, most accurate tune yet. Steady readings: notes hold instead of flickering and the needle stops bouncing — even on high strings and classical guitar. Hears more: far better pickup for quiet, acoustic, and un-amplified instruments, especially bass. Sensitivity slider: dial in extra reach for quiet rooms or reject noise in loud ones, with a clear on-screen readout of the level you're using. Smarter detection: fewer octave mix-ups, so your high E stays your high E. Tuned per instrument: improved accuracy for guitar, bass, ukulele, violin, and 12-string. New strobe display for sub-cent precision. Guided tuning: each string lights up and gets checked off as you tune. Thanks for tuning with us — we read every piece of feedback. ### 2.4.9 — 2026-05-11 v2.4.9 — Major update. DOUBLE BASS Full support for the lowest orchestral string instrument. Standard 4-string, Solo Tuning, 5-string, C Extension, and the historical Viennese tuning. Detection down to B0 (30.9 Hz) with optimizations for both arco (bowed) and pizzicato (plucked) playing. 10 WORLD INSTRUMENTS Oud (with four regional tunings: Arabic, Iraqi, Turkish, Egyptian), saz/bağlama (Turkey), charango (Andes), cuatro venezolano and puertorriqueño, tres cubano, bouzouki (Greek and Irish), balalaika (4 sizes), erhu, and pipa. Hidden behind a "Show world instruments" toggle so the picker stays clean. FIVE CONCERT A PITCHES Added 415 Hz (Baroque), 430 Hz (Classical), and 442 Hz (Orchestral) to the existing 432/440 options. For period instrument musicians and modern orchestras. BETTER DETECTION Significantly improved handling of low fundamentals (bass guitar, cello, double bass), bowed instruments (smoother needle on arco notes), and high-fret guitar notes (longer sustain detection). SIMPLER DETECTION MODES Four modes reduced to two — Standard and Pro. Standard handles everything reliably; Pro is for situations where sub-cent precision matters (piano tuning, double bass low octave, reference work). Plus dozens of small refinements: better harmonic correction, startup transient handling, instrument-specific filters, and per-instrument confidence thresholds. Still free. Still no ads. Still no subscriptions. Forever. ### 2.2.3 — 2026-05-07 No release notes. ## More apps by Seth Adam Mundall - [Bible LSG](https://appshunter.io/ios/app/bible-lsg/id1626079547) - [Hymnal Adventist](https://appshunter.io/ios/app/hymnal-adventist/id6446034427) - [ionBible: Read, Study & Listen](https://appshunter.io/ios/app/ionbible-read-study-and-listen/id6447587266) - [ionBible: KJV Study Bible](https://appshunter.io/ios/app/ionbible-kjv-study-bible/id6447638034) - [Hymnal Adventist lite](https://appshunter.io/ios/app/hymnal-adventist-lite/id6447645698) All apps by Seth Adam Mundall: https://appshunter.io/developer/1626079549 ## Related topics [seth adam mundall](https://appshunter.io/ios/topics/seth-adam-mundall) --- *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 2026-06-25.*