The tuner pros use backstage, on your phone
Savior Guitar Tuner: Pro is a strobe guitar tuner app for iPhone and Android with 0.1 cent accuracy. It works fully offline, shows no ads, needs no account, and costs one price. Built by a touring guitar tech for the stage, not the app store charts.
One price. No subscription, no ads, no account.
$7.99 $9.99 Launch price, limited time
Everything the free tuner can't do
0.1 cent accuracy
Most phone tuners round to a cent or two. The strobe engine tracks the phase of the note between readings, so you can see drift a needle would hide.
Four displays
Strobe (x1 to x8 bands), needle, cents readout, and a scrolling trail to watch a note settle.
Works completely offline
Basement rehearsal rooms, venues with no service, the van.
Tuned like a tech tunes
Per-string offsets for acoustic, electric, 12-string, and bass so chords ring true across the neck.
A4 calibration, 432 to 446 Hz
Adjust in 0.1 Hz steps, with reference tones that follow the calibration. Tap any string to tune by ear when the mic can't hear you.
Built for a dark stage
Large readout, six glowing color palettes, screen stays awake, haptic lock when a string lands.
Private by design
No network requests, no data collected, nothing recorded.
Modes: chromatic (any pitched instrument), standard, drop D, half step down, drop C, D standard, bass (4-string, low B), and ukulele (GCEA).
What makes a strobe tuner more accurate
A needle tuner samples the pitch of a note, averages it, and moves a pointer. Most needle and clip-on tuners resolve to about 1 cent, and their “in tune” window is often 1 to 2 cents on either side of pitch. A strobe tuner compares the incoming note against the target frequency continuously and shows the difference as motion: the bands roll when you are off, slow as you get close, and stop when you are on pitch. Savior Guitar Tuner: Pro reads to 0.1 cent, ten times finer than a typical needle tuner.
That difference matters more than it sounds. Most people can hear a pitch difference of around 5 cents on a single note. On a guitar, six strings each sitting 1 to 2 cents off in different directions stack into chords that sound slightly sour or chorused, the sound players often blame on the guitar. Tune every string to within a tenth of a cent and chords ring clean.
Strobe tuners are what guitar techs use on the bench and backstage because the display cannot be fooled by a wobbling needle. Savior Guitar Tuner: Pro puts that display on a phone, with the same per-string offsets a tech would dial in so the guitar plays in tune across the whole neck, not only at the open strings.
See it on stage
From a working tech
Savior Guitar is the repair and setup shop of Aron Robbins, a touring guitar tech trusted by the artists behind Bruno Mars, Maxwell, J. Cole, Justin Bieber, Mary J. Blige and D'Angelo. This is the tuner he built for the bench and the stage.
Free web tuner vs. Pro app
| Feature | Web tuner (free) | App (Pro) |
|---|---|---|
| Strobe, needle, cents and trail displays | ✓ | ✓ |
| 0.1 cent accuracy | ✓ | ✓ |
| Per-string offsets and A4 calibration | ✓ | ✓ |
| Advanced noise filtering | – | ✓ |
| Full-screen stage layout | – | ✓ |
| Mobile screen stays awake, haptic lock | – | ✓ |
| Starts listening on launch, no browser prompts | – | ✓ |
| Works offline | – | ✓ |
| Ads | None | None |
| Price | Free | $7.99 one time, launch price (regular $9.99) |
Frequently asked
How accurate is Savior Guitar Tuner: Pro?
It reads pitch to 0.1 cent. Most phone and clip-on tuners resolve to about 1 cent, so the strobe display shows drift ten times finer than a needle tuner.
What is the difference between a strobe tuner and a needle tuner?
A needle tuner averages the pitch and points at it, usually within 1 to 2 cents. A strobe tuner compares the note to the target frequency continuously and shows the difference as motion: the bands roll when you are off and stop when you are on pitch. Strobe tuners are the standard on repair benches and backstage because they show drift a needle hides.
Is there a free strobe tuner app?
The free web tuners on this site use the same strobe display and 0.1 cent engine, in your browser, with no signup. Savior Guitar Tuner: Pro is the paid iPhone and Android app that adds offline use, stronger noise filtering, a full-screen stage layout, and a screen that stays awake.
Is there a free version?
Yes, the online tuners on this site are free. The app is a one-time purchase.
Is it a subscription?
No. Buy once, everything included.
Does it work without internet?
Yes, pitch detection runs entirely on the device.
Which tunings are included?
Chromatic, standard, drop D, half step down, drop C, D standard, bass, and ukulele. Chromatic mode covers any other tuning you need.
Does it tune bass and ukulele?
Yes, both have dedicated modes.
Is it on iPhone and Android?
Yes. Savior Guitar Tuner: Pro is on the App Store for iPhone and on Google Play for Android.