If you run a Slack community or have customer-facing Slack channels, you are sitting on a goldmine of organic praise that never makes it to your website.
Users drop feedback like "just integrated this and it saved our team 3 hours" in passing — between bug reports, feature requests, and random conversation. That message gets a few emoji reactions, maybe a "glad to hear it" reply, and then it disappears into the scroll. Nobody screenshots it. Nobody asks if they can use it. It just sinks.
That one message is worth more than any testimonial you could write yourself. It was unsolicited. It was specific. It was written for peers, not for your marketing page. And you let it vanish.
This guide is about building a system so that never happens again.
Why Slack Testimonials Are Uniquely Valuable
Before the workflow, it is worth understanding what makes Slack praise different from other testimonial sources.
The voice is completely natural. When someone writes a message in Slack, they are not filling out a review form or responding to a "would you mind sharing your experience" email. They are talking to colleagues or community members. The language is unfiltered, specific, and conversational — exactly the voice that resonates with potential customers.
The details are specific. Slack messages tend to include concrete context. "We switched from [old tool] to yours last week and our deploy time dropped from 45 minutes to 12." That kind of specificity almost never shows up in solicited testimonials, where people default to vague praise like "great product, very helpful."
The context is peer-to-peer. In a community Slack, the person writing that message is talking to other practitioners — not performing for your marketing team. That dynamic is exactly what makes testimonials credible: a real person recommending something to their real peers, with nothing to gain from it.
Real identity is built in. Slack profiles typically include the person's full name, job title, and company — often more reliably than X profiles. This gives you attribution without having to chase it down.
The challenge is that all of this value is locked inside a private channel. Unlike an X post with a public URL, a Slack message has no verifiable link you can point to. That creates a specific set of problems — and a specific set of solutions.
The Slack Testimonial Capture Workflow
Step 1: Create a #praise channel
Set up a private Slack channel — call it #praise, #testimonials, or #wins — where you or your team copy positive messages as they appear.
You do not need to do this manually. Reacji Channeler is a free Slack app that automatically forwards any message receiving a specific emoji reaction to a designated channel. Set it so any message that gets a star, a fire emoji, or a custom :testimonial: reaction gets forwarded to #praise.
This is the single most important step. Without a capture mechanism, you are relying on memory, and memory does not scale. The #praise channel becomes your running log of every positive thing a user has ever said in your Slack workspace.
Step 2: Review weekly
Block 15 minutes each week — Friday afternoon works well — to go through the #praise channel and identify the strongest messages.
Not everything that lands there will be testimonial-worthy. You are looking for messages that meet specific criteria:
- Mentions a concrete outcome — time saved, money saved, problem eliminated, workflow improved
- Compares you to an alternative — "we tried X and Y before this, and this is the first one that actually worked"
- Expresses genuine surprise — "I honestly didn't expect this to be this good"
- Comes from someone with a recognizable title or company — a VP of Engineering carries more weight than an anonymous username
General enthusiasm is fine for volume, but specific outcomes are what convert visitors. Prioritize accordingly. For a deeper framework on scoring testimonial quality, see how to collect testimonials at scale.
Step 3: Ask permission
This step is non-negotiable. Slack messages are written in a private context, and using them publicly without consent is a fast way to erode community trust.
The ask is simple. DM the person directly:
"Hey [name], loved your message about [specific thing they said]. Would you be okay with us featuring that as a testimonial on our website? We'd include your name and title. Totally fine if not — just wanted to ask."
The response rate on these requests is remarkably high — most people are flattered. They said something positive because they meant it, and being asked to share it publicly feels like recognition, not a burden.
If they say yes, confirm exactly what you will display: the quote, their name, their title, and their company. Some people will want to tweak the wording slightly for a public audience, and that is fine.
Step 4: Get it into a verifiable format
This is where most Slack testimonial workflows fall apart. You have permission to use the quote, but you have no public URL to link to. Anyone visiting your site has to take your word that a real person said this in a real Slack channel.
You have several options, ranked by credibility:
Ask them to tweet it. The strongest move. If the person is active on X, ask: "Would you mind posting this as a tweet or replying to one of our posts? We'd love to feature it on our site with a link back to the original." Now you have a public, verifiable testimonial that you can embed directly. This is where tools like LaunchWall come in — once the praise lives on X, you can pull it into an embeddable carousel in minutes.
Get a written testimonial with attribution. If they will not tweet it, use their approved quote as a formatted testimonial with their name, title, company, and a note like "via Slack community." This is the standard approach and works well when paired with other verifiable proof.
Ask for a short video. Some power users — especially those who are genuinely enthusiastic — will record a 30-second Loom. This is the highest-converting testimonial format by a significant margin. It is also the biggest ask, so reserve it for your most engaged users. For a breakdown of when video outperforms text, see video vs text testimonials.
The Verification Problem (And How to Solve It)
Slack messages are private by nature. There is no public URL, no way for a visitor to click through and confirm that the person actually said what you claim they said. This makes Slack testimonials inherently less verifiable than X posts, Google reviews, or any other public-facing proof.
This does not make them useless — it means you need to pair them strategically.
The most effective approach is layering. Use Slack-sourced quotes alongside publicly verifiable social proof. "Here's what our community says" (Slack quotes with name and title attribution) next to "See what people are saying on X" (an embedded carousel of real, clickable tweets). The public proof validates the private proof. Together, they are more convincing than either would be alone.
If you are building a testimonial page or a social proof section on your landing page, mix formats deliberately. A Slack quote card next to an embedded tweet next to a case study excerpt gives visitors multiple signals from multiple sources — and that diversity of proof is what builds real trust.
For a broader look at how to combine community feedback with other proof types, see community-sourced social proof.
Automating the Capture
Once you have the basic workflow down, you can automate most of the collection so it runs in the background.
Reacji Channeler is the starting point. Configure it to forward messages with specific emoji reactions (heart, star, fire, or a custom :win: emoji) to your #praise channel. Encourage your team to react to positive messages with the designated emoji so they get captured automatically.
Slack search operators are useful for retroactive sweeps. Try in:#general has::heart: to find messages in your general channel that received heart reactions. Or in:#support "thank you" to surface gratitude messages in your support channel. Run these searches monthly to catch things the Reacji system missed.
Zapier or Make integrations can automatically log Slack messages with certain reactions to a Google Sheet, Notion database, or Airtable. This gives you a structured, searchable testimonial library outside of Slack — useful when you are building a new landing page or sales deck and need to pull relevant quotes quickly.
Monthly review cadence: 15 minutes to review the #praise channel and your tracking sheet. 5 minutes to DM your top 2-3 people for permission. 5 minutes to add approved quotes to your site. Total time: 25 minutes per month for a continuously growing testimonial library.
For more on building systems that keep your testimonial pipeline full without constant manual effort, see how to get testimonials without asking.
FAQ
Can I use Slack messages as testimonials without permission?
Technically, nothing prevents you from screenshotting a Slack message and putting it on your website. But you should not. Slack conversations happen in a semi-private context, and most people expect that what they say in a Slack channel stays in that Slack channel unless they explicitly agree otherwise. Using messages without permission risks damaging trust with your community — which is far more valuable than any single testimonial. Always ask first.
How do I find the best testimonial-worthy messages in Slack?
Search for outcome-specific language: "saved," "replaced," "switched from," "finally," "game changer," "hours," "minutes." These terms tend to appear in messages that describe concrete results rather than vague praise. Also search for messages with high emoji reaction counts — if multiple community members reacted positively, the message probably resonated. Set up Reacji Channeler to auto-capture these going forward so you do not have to search retroactively.
Are Slack testimonials credible on a website?
They are credible when presented honestly and paired with other proof. A Slack quote with the person's real name, title, and company — and a note that it came from your Slack community — reads as authentic. Where they lose credibility is when they stand alone without any verifiable proof alongside them. Pair Slack quotes with embedded X testimonials, case studies, or testimonial request email templates that generate public reviews, and the overall proof section becomes much stronger.
How do I display Slack testimonials alongside other social proof?
Mix formats on the same page. Use quote cards for Slack testimonials (with name, title, company, and "via Slack" attribution), embedded tweet carousels for X testimonials, and video thumbnails for Loom testimonials. The format variety itself signals authenticity — a page with five identical-looking quote cards feels curated, while a page mixing tweets, videos, and attributed quotes from different sources feels real. For placement strategy, see where to place testimonials on a landing page.
The best testimonials your users will ever give you are the ones they wrote without being asked — in a Slack channel, in passing, to their peers. The only question is whether you have a system to capture them before they disappear.
Build the capture system. Ask permission. Get the strongest ones into a public, verifiable format. And pair everything with proof that visitors can click and confirm for themselves.
Turn your strongest customer feedback into embeddable social proof →