The valuable features are mainly group chat, calling, easy sharing of attachments, and pinning items. These might be basic features, but they make life much easier.
CTO at a tech services company with 11-50 employees
The valuable features are group chat, sharing of attachments, and pinning items.
What is most valuable?
How has it helped my organization?
Communication with clients became easy. Different groups for different teams helped a lot in the planning and execution. Everyone stays updated with the progress without any ambiguity.
What needs improvement?
I believe they can improve upon ‘calling’, which was introduced recently.
For how long have I used the solution?
I have been using this solution for more than a year.
Buyer's Guide
Slack
March 2025

Learn what your peers think about Slack. Get advice and tips from experienced pros sharing their opinions. Updated: March 2025.
842,592 professionals have used our research since 2012.
What do I think about the stability of the solution?
There were not many issues with stability, but whenever they introduced a new update, the loading time went up.
What do I think about the scalability of the solution?
There were no issues with scalability.
How are customer service and support?
Technical support is good. They are pretty quick with responses and provide excellent support.
Which solution did I use previously and why did I switch?
We were using Skype. We switched mainly because maintaining different client organizations is pretty easy on Slack.
Other reasons include the powerful search feature, rich messaging, a more customizable interface, chat functionality, and email notifications.
How was the initial setup?
The setup was pretty simple and quick. The sign up form was easy and the complete onboarding process was quite smooth.
What's my experience with pricing, setup cost, and licensing?
Slack is actually rewriting the rules on SaaS pricing. It’s free for basic use and offers some awesome features at no cost at all. I will highly recommend Slack to other companies.
Which other solutions did I evaluate?
We didn’t look at other alternatives.
What other advice do I have?
I am not sure if someone is looking to implement a product like Slack, but if someone is really looking for it, then it’s not that easy.
Slack took many months/years to get to this stage. More importantly, they focused on small and medium sized enterprises, which was their biggest market.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
VP of Marketing at OurCrowd
It's fairly simple to get used to. Also, the cross platform experience between the web version, mobile and desktop apps is impressively smooth.
Valuable Features:
Having group chats and one-on-one chats in one place makes Slack conventient. It's fairly simple to get used to. Also, the cross platform experience between mobile app, desktop app, and web version is impressively smooth.
Improvements to My Organization:
More often than not, members of our team are on the go rather than in the office. With Slack we have increased communication between teams which has improved executions of complex interdepartmental procedures.
Room for Improvement:
There is some lag at times. Also, would prefer video chat functionality built in rather than as an add-on.
Use of Solution:
Two years.
Deployment Issues:
Nope. Only colleague resistance on certain teams.
Stability Issues:
A bit of lag as mentioned.
Customer Service:
Haven't experienced a customer support representative. Site help docs are fairly strong.
Initial Setup:
Extremely straightforward.
Other Solutions Considered:
Yes. We tried Skype, Viber, Gchat.
Other Advice:
There is a built-in cuteness factor with animated gif options as commentary.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Buyer's Guide
Slack
March 2025

Learn what your peers think about Slack. Get advice and tips from experienced pros sharing their opinions. Updated: March 2025.
842,592 professionals have used our research since 2012.
Data Science Consultant at a tech services company with 11-50 employees
Provides integration between devices, effective organization of shared content, and syntax highlighting.
What is most valuable?
- Seamless integration between devices
- Effective organization of shared content (documents, images, etc.) keeps team on same page
- Syntax highlighting
- Nice overall UX
How has it helped my organization?
Slack kept several remote employees working cohesively and seamlessly together, allowing us to more easily synchronize our efforts and work collaboratively rather than "islands unto ourselves," so to speak. Coding, writing, editing, etc. was all done in an effective manner, as a result.
What needs improvement?
Honestly, I feel like I am nitpicking when I say the UX can be improved. But it is true, incrementally, the UX could see an improvement through extensive tweaking and testing.
For how long have I used the solution?
I have used it for three years.
What was my experience with deployment of the solution?
We have not encountered any deployment issues; it was very smooth.
What do I think about the stability of the solution?
Slack has proved to be the most stable communication tool I have used, to date.
What do I think about the scalability of the solution?
We have not encountered any scalability issues; large teams seem to be handled quite well.
Which solution did I use previously and why did I switch?
I previously used HipChat. The decision was not mine to switch, but I found the switch to be a very positive one. Slack was just more slick, especially with sharing content and keeping a history of it, visible to conversation participants as needed.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Software Engineer at a educational organization with 51-200 employees
Code snippets and notification snoozing are valuable features. I would like meeting functionality.
What is most valuable?
- Code snippets
- Group chat
- Notification snoozing
How has it helped my organization?
Messages are well organized and attachments are not removed from our channels. It’s easy to search for a message through their search functionality. It has improved my company by letting our team work efficiently together and quickly.
What needs improvement?
I would like to have meeting functionality within Slack.
For how long have I used the solution?
I have used it for six months.
What do I think about the stability of the solution?
I have not encountered any stability issues. The program is stable, especially on Linux, which is a major plus.
What do I think about the scalability of the solution?
We use a small team-based approach, so scalability has not been an issue.
How are customer service and technical support?
The APIs are good and their tech support is decent at responding to questions.
Which solution did I use previously and why did I switch?
I previously used HipChat and the new company I work for uses Slack.
How was the initial setup?
Initial setup was a simple and straightforward.
What's my experience with pricing, setup cost, and licensing?
Pricing is not bad at all.
Which other solutions did I evaluate?
Before choosing this product, a few evaluations were made, but Slack seemed to be the one that fit our company’s culture the best.
What other advice do I have?
Use what works best for your team and what your team knows best.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Community Engagement Manager at a tech vendor with 11-50 employees
I appreciate the ability to create multiple private or open channels.
What is most valuable?
I appreciate the ability to create multiple private or open channels.
How has it helped my organization?
- The ability to create ad hoc channels for certain projects has made us more effective.
- The mobile app allows us to communicate on the go, which saves time as well.
- Onboarding new users is easy thanks to Slack's great UI.
What needs improvement?
There seems to be several minutes of delay between getting notifications on the Mac OS app and then receiving them on the iPhone app.
For how long have I used the solution?
I’ve been using Slack for over a year.
What do I think about the stability of the solution?
We haven't really had any stability issues.
How are customer service and technical support?
The product works very well. I haven't personally had the need to contact Slack's support. I did have a question about using Slack several months ago which I posted on Twitter. Their Twitter support team was very responsive and helpful.
Which solution did I use previously and why did I switch?
We used Skype before Slack. We switched because Slack offered:
- The ability to create multiple channels
- A more user friendly interface
- The ability to keep us more organized and effective
What's my experience with pricing, setup cost, and licensing?
I would recommend considering staying on the free version. It does limit you in terms of the history of communication and storage, but I think that these problems can be worth overcoming. This is the case especially if you are a smaller team or a startup that needs to watch where you spend your dollars.
Which other solutions did I evaluate?
We decided to just test Slack out first with no intentions to switch from Skype. However, the whole team fell in love with the product. At this current moment, we are experimenting with Workplace though.
What other advice do I have?
Once you sign up, try keeping things clean by creating multiple channels. This will ensure that individual conversations are relevant and that the team does not get distracted by unnecessary chatter.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Marketing specialist at a tech vendor with 51-200 employees
Helps to communicate with cross-functional teams internally
Pros and Cons
- "I like the tool's ability to send voice mail. We can also search for conversations easily in Slack."
- "The tool should be able to fetch a conversation when we search for it even if it is in the thread."
What is our primary use case?
We use Slack for internal communication between cross-functional teams.
What is most valuable?
I like the tool's ability to send voice mail. We can also search for conversations easily in Slack.
What needs improvement?
The tool should be able to fetch a conversation when we search for it even if it is in the thread.
For how long have I used the solution?
I have been using the product for a year.
What do I think about the stability of the solution?
I would rate Slack's stability a seven out of ten. It is difficult to open the tool at times and it restarts again for some reason.
What do I think about the scalability of the solution?
I would rate the tool's scalability a seven out of ten.
How was the initial setup?
Slack is easy to set up.
What other advice do I have?
I use Slack's desktop application. I would rate it an eight out of ten.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Marketing Manager, Cloud Solutions at a tech services company with 10,001+ employees
The ability to create separate channels is valuable.
What is most valuable?
The ability to create separate channels is valuable.
How has it helped my organization?
For projects, it's improved how we share files. The Google Drive extension means that files can be housed right inside of Slack. We can focus on work without distractions.
What needs improvement?
Microsoft and Google are creating competitive equivalents. Slack needs to find a "secret sauce" that can differentiate them further.
For how long have I used the solution?
I have used Slack on and off for the past few years. I use it with some side projects.
What do I think about the stability of the solution?
We have not had any stability issues.
What do I think about the scalability of the solution?
We have not had any scalability issues.
Which solution did I use previously and why did I switch?
We did not have a previous solution.
How was the initial setup?
The initial installation was not at all complex. It was very WYSIWYG.
What's my experience with pricing, setup cost, and licensing?
I use the free version.
Which other solutions did I evaluate?
We did not evaluate any alternatives.
What other advice do I have?
It comes right out of the box. Start exploring!
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Graphic Design, Marketing, Lead Generation at a financial services firm with 1-10 employees
The most valuable features are creating chats with combinations of people and the remind function.
What is most valuable?
Creating chats with any combination of people and the remind function.
How has it helped my organization?
We've been using it almost from the very start. It has helped us keep communication open between our international offices.
What needs improvement?
There are a lot of features in Slack that I don't use, because I don't know about them. I found the remind feature when I Googled the Pomodoro technique. I found this by chance. It would be helpful if Slackbot gave me some tips on features that I don't currently use.
For how long have I used the solution?
We have been using the solution for more than two years.
What do I think about the stability of the solution?
I did not encounter any issues with stability.
What do I think about the scalability of the solution?
I did not encounter any issues with scalability.
How are customer service and technical support?
I have never needed technical support.
Which solution did I use previously and why did I switch?
I did not use another solution previously.
How was the initial setup?
The setup was straightforward.
What other advice do I have?
It is a great product and the mobile app is a big plus.
Disclosure: My company has a business relationship with this vendor other than being a customer: We are partners.

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Love Slack and the BoTs platform looks very interesting / useful as well!