cocoapods-check displays the differences between locked and installed Pods. It can save time by quickly showing whether it's necessary to run pod install. For more information see https://github.com/CocoaPods/CocoaPods/issues/4385 and https://github.com/CocoaPods/CocoaPods/issues/4346.The symbol before each Pod name indicates the status of the Pod. A ~ indicates a version of a Pod exists locally, but the version specified in Podfile.lock is different. A + indicates no version of the Pod exists locally. Pods that don't require an update will not be listed. For development pods the modified time of the Pod's files are checked against the modified time of the lockfile to determine whether the Pod needs installation.