I had atomi for 2 months, it was decent but not that good as they don't go into depth and their quizzes are kinda bad tooIn my experience, I received a free trial but never ended up using it. Instead, a much better alternative imo was Edrolo - however i do think the school has to purchase it for you in order to gain access to their courses.
Otherwise if you can't get Edrolo, I guess you can give HSCStudyLabs a shot, or you can check out Atomi or Learnable (I don't have experience with these ones so I can't really comment on them)
For me personally, it was excellent for chemistry as supplementary material. Meaning you still need to learn stuff from the textbook first and then use the study lab to clarify and hone in on details while having a bit of fun with extra info. Otherwise, I do not recommend it.im wanting to buy it but idk how good it is