What are the very necessary apps for iPhone?

Dayone, diary application. I use this to collect my rambling gossip, record photos and memories in my life, and the application will automatically add date, weather, location, status, what songs to listen to and so on. If the application of evernote lamp notes can record large and heavy words, then Day is a light application. Compared with the draft, dayone has the advantages of comprehensive information, supporting labels, photos and moving pictures, and being able to search by place and date. More suitable for daily records. Pythonista, the only Python on ios, also contains more than N unique modules of ios, which is absolutely worth the money. I learned python with it. Due, the application of to-do list, has been used lightly, and it has been used heavily in the last month. It is very smooth, easy to gesture and add, and liberates the brain. Soon, this will praise the platform application. Since I blocked the WeChat circle of friends, this is one of my sources of information. Higher quality.