SUS4 Tuner
Tune anything. Stay in tune.
Free · In-App Purchases
Changing tuning between songs, or matching the section before the downbeat. Set A4 to 442 if the band tunes high, and use the strobe for the last cent.
In tune in seconds. Every instrument, every note.
SUS4 Tuner is a chromatic tuner built for anyone who plays — guitar, bass, ukulele, violin, brass, woodwind, or anything in between. Open the app, play a note, and the needle settles on pitch before your hand is off the string.
The A4 reference is adjustable from 430 to 450 Hz so you can match any ensemble, pit orchestra, or recording session. Compact view keeps things simple; Stage view enlarges the display so you can read it from a music stand across the room. The Apple Watch companion means you can tune without touching your phone at all.
• Chromatic tuner — accurate to the cent
• Instrument presets: guitar, bass, ukulele, violin, brass, and woodwind
• Adjustable A4 reference: 430 to 450 Hz
• Cents readout so you know exactly how far off you are
• Compact view for everyday use; Stage view for the music stand
• Apple Watch companion — glance, tune, play
• Subscribe monthly, or unlock the full SUS4 suite forever: alternative tunings and brass/woodwind presets
The tuner runs entirely on your device. No audio is ever sent to a server. No account needed.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Stability and performance improvements.
The developer, ThePaulSmith, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Paul Smith
- Size
- 21.9 MB
- Category
- Music
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SUS4 Tuner Lifetime £59.99
- SUS4 All-Access £4.99
- Lifetime Unlock (All Apps) £59.99
- SUS4 Tuner Pro Monthly £0.99
- SUS4 Suite (all 24 apps) £4.99
- Copyright
- © 2026 4chords Studios