Here's a tip (that everyone probably knew already) for tuning a half or whole step down if you use a free tuning app that only lets you tune to standard : r/guitarlessons
Master Bass Guitar Tuner for Android - APK Download
Best Guitar Tuner App 2021: 11+ Free Apps for Android & iPhone
Guitar Tuner for iOS, iPhone & iPad App | ProGuitar
Top 3 Guitar Tuner Apps on Android - Technastic
10 best guitar tuner apps for Android - Android Authority
Master Guitar Tuner for Android - APK Download
Guitar tuner open source library, android app and wear app written in kotlin : r/Kotlin
Fender Releases Its Own Guitar Tuner App and It Works Very Well