Instead of Centerline
Centerline alternatives
Centerline combines chromatic and guitar tuning across Android, iOS, and macOS. Its chromatic mode follows notes from 62–800 Hz and offers Simple, Trail, Strobe, and Workbench views, while Trail keeps six seconds of pitch history. Guitar mode adds automatic string detection, direct string selection, standard tuning, All Strings progress, and a headstock view. Tuning works offline, pitch analysis stays on the device, and there are no ads or account requirements. The free plan covers core tuning; a $3.99 one-time purchase adds alternate and custom tunings, capo settings, A4 calibration, and reference tones.
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GuitarTuner.io
Free plan AndroidiPhoneMac+2Broad tuning coverage with browser and practice tools — GuitarTuner.io adds 69 tuners, custom string layouts, chord diagrams, and a metronome across browsers and apps.
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Bandmate Chromatic Tuner
Free plan AndroidiPhoneWebStudents and educators tuning varied school instruments — Bandmate targets band, orchestra, guitar, and voice with transposed staff notation and a ±5-cent green indicator.
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Chroma Ad-Blocker
Free plan ExtensionLinuxMac+1Local ad blocking in Chromium browsers — Chroma Ad-Blocker is a desktop browser extension for blocking ads, not an instrument tuner.
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ChromTuner
Free plan iPhoneMacWebMac musicians needing metronome and detailed pitch displays — ChromTuner adds Mac audio-interface support, 15 presets, historical temperaments, transpose, and a 40–240 BPM metronome.
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Cifra Club Tuner
Free plan AndroidiPhoneWebSimple guitar or ukulele tuning on mobile or web — Cifra Club Tuner offers browser tuning and several guitar presets, while String-by-String and extra features require a subscription.
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GuitarTunePro
Free plan AndroidiPhoneWebBrowser tuning for guitars, basses, and ukulele — GuitarTunePro supports more guitar and bass string counts, visual peg guidance, reference tones, and three accuracy modes.
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JustATuner
Free plan LinuxMacWindowsDesktop just-intonation practice and drone work — JustATuner adds configurable stroboscopic wheels, interval analysis, just-intonation drones, and a Lissajous visualizer.
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Airyware Tuner
Free plan AndroidiPhoneWindows7.6 Visit site - 9
BOSS Tuner App
Free plan AndroidiPhone - 10
Fender Tune
Free plan AndroidiPhone - 11
DaTuner
Free plan Android - 12
DaTuner Online
Free plan Web - 13
Fine Tuner
Free plan AndroidiPhoneWindows - 14
insTuner
Free plan iPhoneMac - 15
Intunator
Free plan AndroidiPhone - 16
Nembrini Audio Chromatic Tuner
Free plan iPhoneMacWindows - 17
gStrings
Free plan Android - 18
LunaTuna
Free plan iPhoneMac - 19
n-Track Tuner
Free plan AndroidiPhone - 20
Pro Guitar Tuner
Free plan AndroidiPhoneWeb - 21
Soundcorset Tuner
Free plan AndroidiPhoneMac - 22
Moekadu Tuner
Free plan Android - 23
Pano Tuner
Free plan AndroidiPhone - 24
Pitched Tuner
Free plan AndroidiPhone
An alternative may fit better if you need browser access, broader instrument coverage, metronome tools, or specialized practice features. Centerline’s chromatic range does not cover the full piano range or a bass guitar’s lowest notes, and All Strings remembers individual readings instead of measuring a chord at once. Compare supported devices, instruments, tuning presets, displays, privacy handling, offline access, and paid feature limits before switching.