Went to Japan last month and from my research, KKday had the best eSIM deals when comparing with Klook, TravelKon, Airalo etc.
Understand that TravelKon has a sale right now, KKday is still cheaper (keep in mind that these are normal prices, so KKday would be an even better option after TravelKon's sale). Comparing like-for-like:
10 GB for 30 Days
$15.83 vs $17.50 at TravelKon15 GB for 30 Days
$19.32 vs $19.50 at TravelKon1 GB/Day for 7 Days
$10.71 vs $14.25 at TravelKon
From memory, they were Hong Kong eSIMs that used the KDDI 4G network. They were generally fast and reliable, and would use again.
Extra 5% off if you download their app and apply the code APP5OFF.
KKday is based in Taiwan and the base currency is TWD. Their exchange rates are spot on, can't say it's necessarily better to pay in TWD.
Daily traffic plan: After the traffic is used up, the speed will be reduced to 128kbps, and the traffic will be restored 24 hours after it is enabled (for example: it will be activated at 11:00 on the same day, and the high-speed 1GB will be restored at 11:00 the next day)
Total plan: disconnect the network after the traffic is used up
Before purchasing, please make sure that your mobile phone and its operating system support the eSIM function. If the order is canceled due to device incompatibility, no refund will be issued (please refer to the eSIM applicable model chart below)
iPhones sold in mainland China do not support eSIM. In Hong Kong and Macau, only iPhone 13 mini, iPhone 12 mini, iPhone SE 2020 and iPhone XS have eSIM functionality
Does the KKday app install the esims like Airalo does?