natto machine can make yogurt, but the yogurt machine can't make natto.

Usually, the fermentation temperature of yogurt machine is 43-45 C, and it is about 4°C in natto machine. Natto can be used to make yogurt, which shows that the temperature in natto machine is not higher than 43°C, and yogurt starter can ferment yogurt, which takes a little longer than yogurt machine. The yogurt machine can't make natto because the temperature of the yogurt machine is higher than 4°C, which is not suitable for the fermentation of Bacillus natto.

to put it simply, we usually take a bath at about 4°C, and 36-37 c is also acceptable. when the temperature is 42-45 c, most of us can't adapt.

On the other hand, the yogurt machine can't make natto, mainly because the fermentation tank of the yogurt machine doesn't have the fermentation device like natto machine. Yogurt machine can only provide temperature and air, without a certain humidity.