Privacy Policy
Struno — Guitar Tuner & Music Toolkit
Last updated: February 26, 2026
● Introduction
Struno is an iOS app for musicians — a tuner, chord library, scale reference, and metronome in one place. Your privacy is fundamental to how we build this app: all audio processing happens on your device, and we have no servers or user accounts.
● Information We Collect
Microphone Access
- →Used for real-time pitch detection when tuning your instrument
- ✓Audio is processed locally on your device using AudioKit
- ✓No audio is ever recorded, stored, or transmitted
- ✓Microphone is only active while the tuner screen is open
Local Preferences
- ✓Selected instrument and tuning settings
- ✓Metronome BPM, time signature, and sound preferences
- ✓Saved chord progressions and scale selections
- ✓All stored locally on your device
Subscription Data (via Adapty)
- →Device ID (internal, non-advertising) and purchase information
- →Used to manage your subscription status
- ✓IDFA collection is disabled
● Information We Do NOT Collect
✕Personal information (name, email, phone number)
✕IDFA or advertising identifiers
✕Audio recordings or sound samples
✕Behavioral analytics or usage tracking
✕Location data
✕Data synced to any server
● Third-Party Services
| Service | Purpose | Data Shared |
|---|---|---|
| Adapty | Subscription management | Purchase data, device info→ |
| Apple App Store | Purchases | Standard purchase data |
● Your Rights
- • Revoke microphone access anytime in iOS Settings
- • Delete all data by removing the app
- • Cancel subscription via App Store
- • Request Adapty data deletion through their support
● Data Security
- • All data is stored locally on your device
- • No proprietary servers or cloud storage
- • Audio is never transmitted over the network
- • Protected by standard iOS security mechanisms
● Children's Privacy
Struno is not intended for children under 13 years of age. We do not knowingly collect personal information from children.
Contact Us
Have questions about this Privacy Policy? Get in touch