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FeaturesGoogle TasksProducteevNozbeToodledoRemember the Milk (RTM)OmniFocus for iPadErrandsPaperlessAction MethodTrello Get Things DonePomodoroGQueues
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Google Calendaryesn/a2 way syncsubscribesubscribe; buggypulls in info from iCal but no syncingnono
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Task Durationnonoyesyesyes, but doesn't import to Google Calendaryesby date not hoursno
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Labelsnoyesyes for projectsyesyes, but hard to findyesnono
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Primary Organizationlistsworkspaceprojectsfolderlistsprojectfoldersfolders
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Contextsnonoyesyesnoyesnono
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DisplayIn email, calendar, straight list viewlist, productive calendar / unscheduled tasks, by label, starred, due today, lateGoogle Calendarso, so, so many ways to viewon android, defaults to due today; badge on iOS; Gmail browser addon by date duecan display by project, context, map (GPS enabled), and timeline (past, 7 days, future)list by folderslist by folders
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Desktop Appnoyes for Macyes for Macvia ToDo for Macnoyesnono
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Costfreeall features free; pay for more workspacesall features free; pay for more than 5 contexts; $89/yrbasic task management is free; analytical tools, group collaboration tools premium$25/year$40 for iPad (think it was $30 for iPhone and $80 for Mac)free or upgrade to premium for $2.99 (no added features for upgrade)low cost app
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Mobile Supportsort ofallallnative iOS, mobile web, 3rd partyalldifferent versions for different devices but can sync across alliPad appiPad app
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NotesLike display best, but no hook to Google Calendar is a problem & calendar/unscheduled view not in desktop appbarebones desktop app, but less busy than web & likely to work from calendar more anywayreally complicated; calendar gadget is buggyeasy to jump right in and start using. iPad version a good middle ground for ease of use with some project management functionality. Mac version much more robust. Didn't test iPhone version but seems similar to iPad one.to do lists, not project management; backs up via email, has iCloud sync; nice appNot calendar based, no ability to set folders into hierarchy; Nice list app with check box option for to-dos; automatic backup to dropbox, also email back up/export is available
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Notes 2I've had subscription access to Toodledo this year...like it at first but am getting tired of it! (LH)http://www.omnigroup.com/blog/entry/omnifocus-for-academics
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Notifications
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Collaborative Aspect
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Google Apps Marketplace
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Ability to be logged in to multiple accounts at once (personal vs. professional with Google accounts)
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