1, capacity identification is different: the red card is used to identify the model of a large-capacity memory card, which is suitable for application scenarios that require a lot of storage space, and the blue card is used to identify the model of a small-capacity memory card, which is suitable for scenarios that require little storage space.

2. Different performance: the red card has higher reading and writing speed and faster transmission rate, while the blue card has slower reading and writing speed and transmission rate, which is more suitable for normal data storage and backup requirements.

3. Different prices: the performance and capacity of the red card are higher and the price is higher, while the performance and capacity of the blue card are not as good as that of the red card and the price is lower than that of the red card.