iontuner vs OpenString

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.

Every guitar practice tool is included: tuner, metronome, chord handbook, and a personal songbook. No subscription, no account, and no catalog paywall. OpenString is built for guitarists who want the tools on their phone, not a rented song library. Install it from the App Store. You get the tuner, metronome, chords, and songbook. There is nothing left to unlock later. WHAT YOU GET Guitar tuner Tune a standard six-string guitar with the microphone. Choose a preset, let the app pick the string or choose it yourself, and play a reference note when you want a target pitch. Audio is processed on your iPhone. It is never recorded or uploaded. Metronome Keep time from 40 to 240 BPM. Tap a tempo, set the meter, choose subdivisions and accents, run a practice timer, or mute the click and follow the beat visually. Chord handbook Look up common major, minor, and seventh fingerings in standard guitar tuning. Search the handbook, save favorites, hear a reference voicing, and jump to alternate positions on the neck. Personal songbook Keep your own lyrics and chords. Transpose the displayed key and save a capo preference without rewriting the source chart. Add song metadata, build named setlists, practice with autoscroll, jump to chords used in a song, and import ChordPro. Create and edit on your phone, then export a backup to a destination you choose and restore it later. Song to chords Pick a song and get its chords and words together in one tap, ready to play and sing. Scale and shape finder Type a scale like A minor pentatonic and see its box shapes on the neck, with the fret positions you actually play them in. HOW THIS IS DIFFERENT There are no in-app purchases and no subscription. Every current tool is included with the app. The tuner, metronome, chord handbook, and songbook are not split across plans. No commercial song catalog is included. Your songbook is filled by you, whether you type it or import ChordPro. That is the point: your charts, your lyrics, your practice. The app works offline and needs no account. No feed. No ads in the app. WHO IT IS FOR Players who want a tuner, metronome, chord diagrams, and their own charts in one place. People who write songs, type lyrics and chords they already play, or import ChordPro. WHO IT IS NOT FOR OpenString does not rent you a library of popular songs or official tabs. If you want a commercial catalog behind a monthly plan, this is not that app. OpenString is built for guitar practice on iPhone.