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Pro Has its own syntax for programming smart lists
Smart lists are configured using Remember the Milk's syntax, making it very customizable.
Pro Powerful query language
Query language can be used to build your own GTD-based system, with tags and lists and queries. Such as system can be used for private life and work alongside several simple lists without things getting mixed up.
Pro Excellent cross platform support
Whether you depend on an iOS, Windows or Android phone; Google Calendar or Outlook; Evernote or Twitter: RTM has an app or extension for you.
Pro Support of a "start" date
A start date can be set which can be used with smartlists or to set a reminder.
Pro Support for keywords to set due/start date, add to list with one line of text
There are special characters which open a box so the user can select predefined values or a calendar picker.
Pro Lightning fast sync
Syncs quickly across all your devices and platforms.
Pro Semantic shortcuts
Remember The Milk has a list of semantic shortcuts that allow adding tasks and task options faster.
Pro Quickly add rich text
Remember The Milk offers Smart Add – shortcuts that allow you to quickly add advanced information to a task. For example, you can quickly add a due date, set the priority level, add a tag, set repeat times, add URLs, and add notes to your tasks. For the full list, check out How Do I Use Smart Add?
Pro Tasks may have additional options
Extra options such as how often it repeats, the due date, and the location.
Pro Location-based notifications
You can set locations for each task (for example a specific store, or a general location like 'near the beach' for shell collectors), and RTM will remind you when you are near or in that location. This can help keep your daily list uncluttered and remind you of errands you might have forgotten.
Pro Manual sorting
Manual sorting is available on both the web app and android, allowing prioritization of tasks. This can be particularly useful for shopping lists, where you can put all the meat together, and all the cheese together etc. to make it easier to skim through when you're in the store.
Pro Many features already working in the free version
The majority of commonly used features are available for free. The pro version adds increased functionality such as advanced sorting, mobile push notifications and sharing permissions.
Pro Syncs with Evernote
Not only syncing, it's more of a "linking" with a two-way synchronization. Changing the title of a note in Evernote will update the title in Remember the Milk. So far, Remember The Milk is the only to-do app with a feature like this.
Pro Lists can be shared
Share lists with other Remember The Milk users, or with iCal and more. Shared lists can be collaboratively updated. This makes it great for teams or just to share progress with others.
Pro Add tasks via e-mail
You can add tasks to Remember the Milk via email easily once you get the hang of formatting the messages.
Pro Twitter integration
The Twitter integration is excellent and allows for many types of automation.
Con Subtasks only available in Pro version
Subtasks can break a longer to-do item into discrete tasks, helping you keep tabs on your progress.
Con Does not support attachments
No support for cloud providers and/or support to attach/upload images or files.
Con Free version lacks features
Con Cannot add task in notification bar
There is no pull down option to add a task in the notification bar.
Con Ugly icon
The goofy cow image does not fit well with a professsional office environment.
Con Bad UI redesign
The web app takes up too much screen real estate and uses a half-screen format that requires a wide screen. The task edit screen is clunky. It still has UI bugs one year in. You can't complete tasks from the UI.