Where can I find comic text bubble PNGs specifically designed for use in mobile apps?

When searching for mobile app-friendly comic text bubbles, look for PNGs with relatively small file sizes to minimize app loading times. Websites like Freepik and Flaticon often have collections optimized for UI/UX design. Consider using vector-based bubbles (SVG) and converting them to PNG at the required resolution for your app to ensure scalability and sharpness across different screen sizes. Also, search specifically for 'flat design speech bubbles' or 'UI speech bubbles' to find styles suitable for mobile interfaces.