Is Qiqi learning SMS link reliable?

The trustworthy Qiqi Learning APP is a graded reading APP of Himalayan. It is a formal application, and official SMS can be trusted. Like step-by-step reading, the Oxford reading tree is introduced. The difference is that Qiqi Learning English divides the original picture book into 9 levels, and the content of each level corresponds to L 1-9 (Campus Edition) of the Oxford Reading Tree Extended Reading Series.