1. Introduction
Welcome to Ear Training & Tuner. This Privacy Policy explains how we collect, use, store, and protect your personal information, and your rights. Please read it carefully before using our services.
2. Information we collect
2.1 Device information
To improve experience and advertising, we may collect the following device information:
- Device identifiers: IMEI, IMSI, OAID, Android ID, MAC address, GAID (GMS), MEID, ICCID, hardware serial (build_serial)
- Device details: brand, model, OS version, screen density/resolution, language, time zone, CPU info, available storage
- SIM information: mcc & mnc
2.2 Permissions
We need microphone access to detect audio input for core tuning and intonation features. Microphone audio is processed on-device and is not uploaded to our servers. If you use Practice Recording, audio may be saved locally (e.g. WAV) in app storage for playback or deletion—files are not uploaded to our servers.
2.3 Network information
We may collect:
- Carrier info, signal strength, and IP address
2.4 App information
We may collect:
- Package name, running process info, version, foreground/background state, and installed app list information
2.5 Usage data
We may collect statistics such as usage frequency and duration to improve features and experience.
3. How we use information
We use collected information only to:
- Provide and maintain app features
- Improve performance and user experience
- Deliver and measure ads, including anti-fraud and attribution
- Analytics and troubleshooting
- Keep network services stable and reduce crashes
- Comply with legal requirements
We do not use your personal information for other purposes, or share it with third parties, except with your consent or as required by law.
4. Storage and security
We take appropriate technical and organizational measures to protect your information from unauthorized access, disclosure, loss, or misuse. Core audio processing stays on-device and is not uploaded to our servers.
We retain personal information only as long as needed, then delete or anonymize it.
5. Third-party SDKs
Depending on region, our apps may use the following third-party SDK:
5.1 Pangle (穿山甲) Ads SDK
SDK name: Pangle Ads SDK
Provider: Beijing Julang Engine Network Technology Co., Ltd.
Purpose: Ad delivery, performance analysis, and anti-fraud
Privacy policy: https://www.csjplatform.com/privacy
Data collected:
- Device info: brand, model, OS, screen density/resolution, language, time zone, SIM (mcc&mnc), CPU, storage, OAID, Android ID, MAC, IMEI, IMSI, ICCID, GAID (GMS only), MEID, build_serial
- Network info: carrier, Wi-Fi status, signal strength, IP
- App info: package name, processes, version, foreground/background, app list
- Sensors: linear acceleration, magnetic field, rotation vector, accelerometer, gyroscope
- Ad interaction data: impressions, clicks, conversions
- Location: precise/approximate location (Wi-Fi list, WLAN access points such as SSID/BSSID, cell towers)
- Performance data: crashes and performance metrics
We configure SDKs carefully to comply with applicable laws while keeping features working.
6. Your rights
You may request access to, correction of, or deletion of your personal information. Contact us using the details below to exercise these rights.
7. Policy updates
We may update this Privacy Policy from time to time. Updated versions will be published in the app. Please check regularly for the latest policy.
8. Contact us
If you have questions about this Privacy Policy, contact us at:
Email: andysong315@gmail.com
9. Effective date
This Privacy Policy is effective as of 2026-04-26.