The DSTT and DSTTi are made by ndstt.com. TTDS card is made for Nintendo DS and DS LIte, while DSTTi support NDSi and NDSi XL. They are as compatible version of the R4 DS. DSTT and DSTTi offer faster loading speed. It is also a famous flashcard with good compatibilitly. The DSTTi has a list-format user interface, making it ideal for playing homebrew applications/games only without multitasking. TT and TTi card support memory card up to 32GB.