Postpaid apps really have increased. Recently, I tried out various ones, but I still couldn't figure out which is the easiest to use. So I compared about 10 popular options.

Personally, I think the best ones are the ones that offer free fees with bank account transfers. Paidy can be used on the same day you register, and installment payments are free up to 12 times. It's convenient because you can also use it on Amazon and in physical stores. Atokara also allows same-day use and lets you spend up to 55,000 yen on your first use.

Additionally, among postpaid apps, those that offer point rewards are quite advantageous. FamilyPay gives 1% cashback, and atone also earns 0.5%. For people who make small purchases frequently, it might be better to choose based on the reward rate rather than low fees.

However, be careful because some apps do not support installment payments. NP Postpay and Score Postpay only support lump-sum payments. If you plan to make large purchases, it's better to choose apps like Paidy or Atokara that support installment payments.

Ultimately, I think there’s not much difference among postpaid apps that are free of charge and can be used immediately. The most practical way is to decide based on whether they are supported at your frequently used websites or convenience stores.