When comparing Pocket vs Slack, the Slant community recommends Pocket for most people. In the question“What are the best Material Design apps?” Pocket is ranked 7th while Slack is ranked 15th. The most important reason people chose Pocket is:
Bookmarks can be tagged for search accuracy later on.
Ranked in these QuestionsQuestion Ranking
Pro Allows tagging bookmarks
Bookmarks can be tagged for search accuracy later on.
Pro Available on the web and mobile devices
Pocket is available on iOS, Android, Kobo eReader and on the web.
Pro Included in Firefox
Pocket is now integrated into the Firefox web browser, and you can login using your firefox/mozilla login, instead of having to create a separate account. This login method can even be used natively on their website, regardless what browser is being used.
Pro Integrates with over 500 apps
A key advantage of Pocket is that it is integrated in over 500 apps as a way to save the link, including Twitter, Flipboard, Pulse and Zite.
Pro Well-finished GUI and UX
Pro Allows reading saved content in offline mode
Instead of only saving the link, the content is saved for offline use.
Pro The Pocket plugin for Google Chrome is very stable
Pro Works well across Google Chrome on macOS and iOS
Pro Highlighting available on iOS
Pro Ability to filter by content type
Pro Robust integration with a huge number of tools
Slack integrates with tools like Trello, GitHub, Dropbox, Mailchimp, and dozens of others, so you can have a centralized event feed of your project right alongside your chat. This is tremendously useful for keeping context with your discussions.
Pro Drag & drop files in channels
You can upload a file to any channel over HTTPS simply by dragging and dropping.
You can ping people to get their attention even if they are not online by @mentioning them. Slack supports desktop notifications.
Pro Fantastic search functionality
You can deep search messages, files and snippets. Given Slacks integration into many external services, Slack is good enough to act as the central search interface for your entire team.
Pro Very polished user experience
The entire Slack interface is polished and intuitive to use. There are very few bugs or inconsistencies in the UI and it's very fast to use. There is nothing in particular that is new with Slacks implementation of team chat, but the execution of the groups (called channels), search, external service integration and notifications is close to perfect.
Pro Syntax coloring
Pasted code can be colored based on syntax.
Pro Inline link previews (photos, mockups, etc.)
When a link is added, some content in the link is shown such as image - like how Facebook does it when you share a link.
Pro Edit messages easily
It allows you to change what you sent by hovering to the message and selecting "Edit message" under the ellipsis (...).
Pro Apps for iOS, Android, Windows Phone, Mac OS, Linux, and Windows
Slack has apps for iOS, Android, Windows Phone, Mac OS, Linux, and Windows to give you the full functionality of Slack with some extra features not found on the website on most major platforms.
Pro Emoji reactions to limit excessive posts and notifications
Pro Supports multiple teams
You can be signed into multiple teams simultaneously and quickly switch between them.
Pro Flexible, granular notification settings
Notifications are handled separately for mobile and the web app. You can receive notifications for all messages, just direct messages, or based on filters, and you can have different settings for different channels: you don't have to get notified every time someone pushed to GitHub or every time someone posts to off-topic chat, unless you want to.
Pro Freemium plan
Free forever, only restriction on searchable message archives, up to 10k of your team’s most recent messages and 10 apps or service integration. Great for trying out first.
Pro Slackbot extensible chat robot
The "Slackbot" can is an extensible robot that can be set you remind you about tasks, auto respond to certain phrases and a variety of other functionality.
Pro Shows local time of each participant
You can click on the profile of a user to see their local time. An especially useful feature when members of your team are working in different timezones.
Pro Dev team is invested, responsive, and friendly
Having submitted both feedback and support requests for bot development, I can personally attest that the team takes feedback seriously, and responds quickly to communication. This is vital for any closed-source or hosted project.
Pro IRC connectivity over SSL
Pro Self chatting
Creative implementation which is very good for personal journaling or drafting/collecting ideas. Previously, to do this, users needed to create a private channel with themselves. Note that some other team-chat apps may disallow creating group/channel with no 2nd person(s).
Pro It can surprise you
There's a checkbox in preferences under advanced options that may surprise you.
Pro Multiple channels for different groups
Con Only the paid version allows to search by tag
Con Can't rename the title of links
If the page title isn't correct/good for a link, there is no way for you to fix it.
Con Can't import Firefox bookmark tags
When importing bookmarks from Firefox, Pocket doesn't include the tags.
Con Correct and open export of bookmarks and tags are not possible
This means that Pocket is (currently) a total lock-in.
This is very sad, unfortunate and creates a no go decision for any seasoned user.
Too many bookmarking and tagging companies have stopped or have gone bankrupt these last years (e.g. Kippt, Spingpad, Delicious (to some extent), etc...). So, if you are going to invest a lot of your personal time and energy in curating your Internet findings (i.e. your bookmarks and tags), it is essential that a total, fair and open export (including all tags) functionality is provided. Personally tested the export "feature" and the resulting .html file that Pocket generates currently included only the URLs themselves, i.e. no save dates nor any of your personally curated tags, nor any other useful meta-data.
This is deplorable, because otherwise, Pocket is a very polished and well-functioning piece of multi-platform and multi-device software/app/web service, with a very easy and well-designed and implemented user interface...
Please fix this, Pocket !
These days of open and inter-operable web services, users are only attracted by valuable functionality, clean UX design and no lockins.
Con Chrome addon doesn't allow you to add tags with keyboard only (have to use mouse) while saving page
Con Chrome addon doesn't let you open your library without saving current page first
Con Expensive when you need to upgrade
At $6.67 per user / month (or $8 if billed monthly) , Slack is significantly more expensive than the competition if you need features such as unlimited integrations (more than 10) or unlimited message storage (more than 10,000). However, the free version of Slack includes unlimited users.
However if you need only unlimited messages you can use storage services like https://slarck.com to upload then browse and search your entire message history, while staying in Slack's free plan. So with a combo of Slack+Slarck this con is not that major.
Con No self-hosting available
If you are worried about third-parties getting access to your data you should consider self-hosting. With self-hosting you are in control over where your data is stored, who has access to it. You will also not be vulnerable to exploits of a third-party provider.
Con Hidden max limit of free users per channel
Slack says that their free accounts support an unlimited number of users, which is true. However they don't mention that there is an undisclosed maximum number of users per channel (8462). For a large open source community, this is something to keep in mind.
Con Proprietary (non-free/libre)
Con Linux client is very RAM intensive
Con "Native" desktop apps are web apps
While it's great that Slack provides installable apps for Windows, macOS, and Linux, they're just the Slack web app wrapped in Electron shell. This means they don't offer the same level of native UX that a truly native toolkit app would.
Con Slow and lags sometimes
Con No E2E encryption
Data is sent of SSL only, not E2E encrypted.
Con API is overall very poor
Can't do much with integrations.
Con Replies are the worst feature implementation of all time
Con API doesn't allow custom widgets in chat
Con Awful performance and constant glitches, since it is Chromium-based
You will experience a lot of hangs and glitches and it eats immense (for as basic as UI is) amount of RAM.