On iOS Evernote provides a useful facility to be able to protect your notes by adding a four digit passcode lock that you have to enter before you can see them. You can also choose how long before the code is asked for on subsequent opens, such as immediately, after one minute etc.
Once enabled this means that you will be initially be asked for your four digit code on opening and then on subsequent opens after the time out period has expired unless you have chosen “immediate” as your option in which case you will always be asked for … Read the rest