David
best teacher ever
best teacher ever

Cosmo provides AI-powered personalized learning for K-12 students. 1:1 Live Online Classes That Click. Real teachers + smart AI, always on your schedule.
Cosmo (formerly ClassUp) (cosmoai.com) has 134 customer reviews on Five Star Index, with an average rating of 4.1 out of 5.
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Education Services · Washington, District of Columbia
Excellent

Education Services · Colorado Springs, Colorado
Excellent

Education Services · Harrisburg, North Carolina
Excellent

Education Services · Rockville, Maryland
Excellent
134 approved reviews, newest moderated first
David
best teacher ever
Nayel E.
My english teacher is very kind and understanding. She also helped me alot when I cannot figure out a problem.
Karthikeya M.
cosmo is teaching me a lot and is so fun and exciting but in gakku.ai, the coins need to be payed but can't wait for similar stuff like battle of the brains
customer
As an adult ESL learner, I have been using the Cosmo App for about a year now and have completed nearly 40 classes. I am extremely satisfied with my progress and the high quality of instruction. The core strength of the program lies in its dedicated teaching staff. I want to give a special shout-out to my favorite teacher, Mr. Jonathan. He is incredibly patient and always takes the time to explain things clearly. Through his ELA-focused lessons, which often dive into novels and poems, I realized that true language mastery is not about counting words or chasing scores. It is the ability to hear a joke and laugh, to read a book and get lost, to speak one's feelings, and to pen one's thoughts.
customer
Really great program! The teachers are patient, dedicated and the app is very easy to use, with lots of fun, interactive tools. Scheduling is very flexible and we have a dedicated rep who takes great care of us. Overall great way for my daughter to solidify what she learned in class.
Tertia C.
Since working with her teacher Ms. Quentin J. over the past few months using the app, my child has improved incredibly in ELA! Very happy with her progress and growth!
Nabanita
We saw an add on FB and thought of trying out a trial class and get to know about the payment structure for our kid. However upon review we found the fees were too high for us to afford and we did let them know. We again received a call after around 3 weeks and and the agent who herself was having an accent just kept pushing for their class and telling how other online classes are not as helpful. I believe they need to respect our decision and leave us alone once we have respectfully given our decision. I am writing this review because I am really frustrated with the call.
Response from Cosmo (formerly ClassUp)Jul 16, 2025
Dear Nabanita, Thank you for taking the time to share your feedback with us. We sincerely apologize for the frustration caused by the follow-up call. It was never our intention to make you feel pressured or disrespected—we truly appreciate your initial interest in our classes and your honesty about the financial considerations. Our goal is to provide helpful information and support to parents exploring educational options for their children. However, we apologize in this instance for not respecting your decision after you kindly declined. We’ve shared your feedback with our team to ensure better communication practices, including more sensitivity to parents’ preferences and boundaries. If you’d ever reconsider in the future, we’d be happy to assist in a way that aligns with your needs—no pressure whatsoever. Thank you again for holding us accountable, and we wish you and your child all the best in finding the right learning path.
Bacalm G.
Cosmo has been a game-changer for my son's writing skills; the feedback is spot-on, and he actually enjoys writing now.