Zero - Todo List (Free) by Functional Delights LLC is a really simple and efficient to do list app for your iPhone. This is one of the sleekest and most efficient to-do apps I've used.
I know, I know. Another to-do list app. But if you're like me, you're always open to new — and pretty! — productivity apps to add to your collection. And, in that rare moment that you are lucky and find something great, you will replace some of your other productivity apps with a new, shiny one.
It's as easy as two taps (or three steps): tap the "enter a new task" box, type in your task, and hit save. Done. And if you need to rearrange the display order of your tasks, it's as simple as clicking and dragging.
One of the best things about this app is notes. You can add endless notations to each task if you need to, so that you never forget the additional information. But, on the other hand, you don't have to add anything extra at all if you prefer to keep it simple.
Zero also has reminders in the form of notifications and badges. And if it is synced with the calendar on your computer (pro version only), it will remind you there, too.
This to-do list app is free in the App Store, but it does come with ads. No one likes ads though (they make me cringe). To remove them, you can currently upgrade to the pro version with an in-app purchase of $3.99. This is a limited time offer as the price will go up eventually, so if you do decide to upgrade, now would be the time to do it.
You can also sign up and try the desktop syncing for free for 14 days, otherwise, upgrading to the pro version will give you lifetime desktop syncing and ad removal.
To me, that isn't too bad for syncing capabilities and ad removal. I don't see any information on other features the pro version includes, though, so I suppose that's it. But you decide if you think it's worth it: give the free version a test run and let us know what you think!