I've looked far and wide (and I still look) - yet there is nothing that touches to undeniable flexibility, the myriad of options, as well as ability to keep simple if you need it.
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Pro Works on all platforms
Available as a Chrome app on desktop operating systems and as an Android and iOS apps.
Pro Mark emails as received, sent to tasks, projects, or waiting for items
With a quick selection you can turn an email into a new task, add it to a project or create a waiting for item. The email is moved from your inbox but available in the task or project. If it's a "waiting for", it will automatically add the To into the Delegated To person.
If you're importing from Gmail, you can use Gmail labels as tags in IQTell.
Pro Feature rich
Integrated email, calendar, Evernote, project and task management, contacts all in one app.
Pro Aggregation of email
Aggregates your email from all of your different email providers. Allows reading and managing your Exchange, Gmail, iCloud, etc emails all in one place. There's support for both unified inboxes and separate inboxes for each account.
Pro Easy to customize
You can add custom fields to all item types, and add custom relationship between items (i.e a project can be linked to a customer or a mail linked to a contact).
Define how data is copied when an item is copied into another (I.e a mail copied into an action or project).
Pro Full-time featured email and calendar client
Your can create, modify and delete emails, appointments, invitations and reminders for multiple email accounts directly in IQTELL.
Pro Convert email to calendar appointment
Convert e-mails to calendar appointments. The e-mail will be linked to the appointment so that you can access it within the calendar event.
Pro Can convert evernote checkboxes to actions automatically
Just add checbox to an evernote note, tag the note with the "action" keyword and iqtell will convert checkbox to subtask automatically. Every checboxes will be automatically converted into a single subtask of an action with the evernote title as title.
Pro Integration with Box, Google Drive, Dropbox and OneDrive
Allows adding reference material to projects and actions linking to several known cloud services.
Pro Application wide tagging system
Any item can be tagged, all tags are centrally managed. If Evernote integration is activated, tags are synced between IQTELL and Evernote.
Pro Allow collaboration on projects and actions
Delegate project and actions to friend, coworkers, customer.
Work together by adding content, discussing and planning each item.
Pro Fast response from support
Support responds quickly to any questions you may have.
Pro The IQTell team listens to suggestions and requests from users
IQTell is being updated all the time to improve on an already great system!
Pro Make recordings of trips and save via iPhone/iPad, recover them later using EOBD Facile application
Con Only works in Chrome
Not everyone wants to use Chrome.
Con Doesn't integrate with IFTTT
Con Unsure future
Some time ago IQTell were prepared to close due to lack of funds, but something must have happened (they received funding) that gave them another two years of life, but after those two years are over it's not sure what will happen.
Con Steep learning curve
The interface can seem overwhelming at first.