Tower of God is a webtoon by SIU. It is currently released weekly. The original Korean version is released weekly on Sunday whilst the official English translation is released the following day.
Feel free to check out the Korean version at Naver.com and also support the official english translations at LINE Webtoon by either downloading the app or reading it at the webpage. Both sources does not require any registration, and above all, it's free of charge. This way readers can officially support SIU for his hard work and assure the continuation of the series.
Korean readers have the opportunity to access new chapters ealier through a small fee (200 Korean Won ~ US$0.20) on the Naver Store.