
SUS4 Tuner: Any Instrument
Banjo, sax, uke, cello presets
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Free
In-App Purchases
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About
You are about to play and something sounds slightly off. Play a note and see whether you are sharp or flat.
Play a note and see how many cents sharp or flat you are.
Chromatic mode tunes any instrument, and 74 presets show each string for guitar, bass, banjo, ukulele, violin, brass and woodwind.
Fully on-device: no cloud, no account.
Pick a preset and the tuner lists its strings, so a banjo in open G or a cello in CGDA shows the right target notes. Stay on Auto and it tells you which string you are playing.
• A needle and a cents readout, with the note name in large type
• Presets for guitar (standard, drop D and more), bass, ukulele, violin and mandolin
• Stage view makes the note big enough to read from a music stand
• A4 reference from 430 to 450 Hz for bands and orchestras that tune elsewhere
• A strobe view for fine adjustment
• Pedalboard: lay out your pedals, drag them into order, save each board by name, and get a suggested signal-chain order with the reasons
• Alt Tunings: 55 open and alternate tunings for guitar and bass, with the target note for every string
For guitarists changing tuning between songs, string players checking the A, and brass and wind players matching a section.
Pro, or SUS4 All-Access across the whole range, adds the other 67 presets: alternate guitar tunings, brass, woodwind, bowed and world instruments. It also lifts the daily limit on chain suggestions and on opening a tuning's string targets.
PART OF THE SUS4 RANGE
Tuner is one of more than 20 SUS4 apps for musicians from the same studio, covering tuning, timing, ear training, transcribing and writing. SUS4 All-Access unlocks all of them with one subscription.
WHAT IT COSTS
The app is free to download and use, with the limits and Pro extras described above. Tuner Pro and SUS4 All-Access are optional subscriptions. The plans on offer and their prices are shown in the app before you pay, and you can cancel at any time in your App Store settings.
Built by Paul at 4ChordsStudios, a working recording studio in the UK.
Who makes it: https://4chords.studio
Contact: hello@4chords.studio
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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What's New in SUS4 Tuner
1.4.0
November 14, 2026
Layouts now adapt to iPhone Duo and other foldable displays. Bug fixes and performance improvements.
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Subscriptions & In-App Purchases
SUS4 All-Access
Pro in every SUS4 app, billed monthly.
$5.991 Month
1 Month trial







