There is NO official SAI APK. Any download link is likely a virus or a fake.
0:00 – Why SAI APKs are fake. 0:45 – Setting up Ibis Paint to feel like SAI. 2:10 – Best brush stabilizer settings. 3:30 – Blending tutorial (SAI style). Paint Tool Sai Android Apk Download
Are you looking to bring the smooth lines and blending power of Paint Tool SAI to your Android tablet or phone? There is NO official SAI APK