When comparing Blossom vs Flow-e, the Slant community recommends Blossom for most people. In the question“What are the best online Kanban boards?” Blossom is ranked 16th while Flow-e is ranked 19th. The most important reason people chose Blossom is:
An update is posted to the Slack channel every time a task is created, completed, moved, or commented upon.
Specs
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Pros
Pro Slack integration
An update is posted to the Slack channel every time a task is created, completed, moved, or commented upon.

Pro Simple & clean interface
Design focuses on clarity.
Pro Never forget an important email
Stay on top of what's current with due date reminders. Focus on your work, Flow-e's got your cues covered!
Pro Visualize your calendar
Your daily schedule is visualized in a timeline. Setting up meetings and reminders without leaving your mailbox is a click away.
Pro Email + Task Management
Designed for managers, Flow-e takes you to Inbox zero and beyond by turning your Gmail or Outlook mailbox into a visual taskboard. Personal tasks and emails are now managed from your mailbox in a visual workflow, customized for your process.
Pro Track your delegated tasks
Delegate work to your team without leaving your inbox and without sacrificing accountability.
Cons
Con No free plan
There is no free plan like for personal use and the minimal cost of $19/month might be prohibitive.
Con Slack integration is really basic
There is no way to interact with tasks in any way - new tasks can't be added, completed tasks can't be removed, tasks can't be assigned, etc. The integration only sends updates to the Slack channel. There is also no way to fine-tune what updates get posted to Slack.
Con No Mobile Application
There is a lack of Mobile application. However, the Flow-e team says that it is coming in 2018!
