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Chetana MalakannavarChetana Malakannavar 

I'm trying complete the Lightning Experience Rollout Specialist challenge #1, but i cant use Optimizer tool. If i go to http://optimizer.salesforce.com/, i receive this message: Offline for maintenance This app is undergoing maintenance right now. Please

Khan AnasKhan Anas (Salesforce Developers) 
Hi Chetana,

Greetings to you!

Please refer to the below links which might help you further with the above issue.

https://success.salesforce.com/answers?id=9063A000000lN7r

https://help.salesforce.com/articleView?id=000323491&type=1&mode=1 (https://help.salesforce.com/articleView?id=000323491&type=1&mode=1)

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas