#general

I would definitely ask the client's permission to make sure you are sharing things they are comfortable with. It's an extra step, but it makes case studies better for you and the client. For the title, I would definitely name drop if possible.

If you're using their branding, screenshots, and stats, I think you should ask. I would ask.

Yes, I always run all case studies through the client. They may need to get their legal department involved and may not be comfortable with you using their name. A lot of orgs have policies where they cannot publicly "endorse" any other brand/service. I always err on the side of caution here to ensure keeping the customer happy.

If you're going to use anything that belongs to the client (i.e. branding, images, stats, etc.), definitely run it with them first before publishing the case study.