While Flipnote Studio was originally a free application for the Nintendo DSi Go to product viewer dialog for this item.
You can run the Flipnote Studio ROM on your computer or phone using a Nintendo DS emulator. flipnote studio ds rom link
Some points to consider:
FSPDS (Flipnote Studio Player for DS): This is a specific homebrew DS ROM that allows users to play original .ppm files on older hardware like the DS Phat or DS Lite. It functions as a player rather than a creative suite. While Flipnote Studio was originally a free application
If you own a DSi with Flipnote Studio already installed (from back in the day), you can use homebrew tools like DSi Link or Memory Pit to export your animations. This is a preservation gray area, but generally accepted if you don’t share copyrighted code. It functions as a player rather than a creative suite