NETAMEMO is a free memo app.Its special feature is that you can leave memo by text, photo, and voice.

When you come up with an interesting idea, you have to memo it down right away or you'll forget it.
But... typing while walking is dangerous, and speaking out loud on the train is embarrassing.
NETAMEMO is a memo app that lets you choose the right method for different situations.

Use text memos when you can operate your smartphone at your leisure, photo memos when you want to keep what you see exactly as it is, and voice memos when you can't perform complex operations. You can manage all your blog ideas in one app. Quickly record what you want to know, write it down, and delete any memos you no longer need.

Please visit the dedicated website for operation instructions.
NETAMEMO - Memo app for recording ideas for your blog - Free