Denis Yanchevskiy

Allows you to make post, page, custom post elements required: title, content, featured image.
After installing the plugin, you need to go to the Settings -> DCO Post Validator to specify the required elements.

DCO Post Validator

Allows you to make post, page, custom post elements required: title, content, featured image.

gilbarbara

Once activated and configured, this plugin will require users to fill selected fields before publishing posts, page, custom post types / custom fields.

Requird

Require users to fill selected fields before posting.

DCO Post Validator vs Requird