Slack has become the default work chat app for many tech companies. But Slack has two huge problems: it’s very expensive, and its free plan comes with a fatal flaw.

On Slack’s free plan, every conversation, decision, and file your team shares is permanently deleted after 90 days. For any business, losing access to your own data is a deal-breaker.

The good news is, there are excellent free Slack alternatives that respect your data. Here are four of the best free work chat apps that can improve your team communication.

What Makes a Great Free Slack Alternative?

When comparing free Slack alternatives, we looked for team chat apps that deliver on three key promises:

  • A Complete Message History: The free plan must allow you to access all of your past conversations. 
  • Professional, Business-Grade Features: A free plan should include all the essential business tools like admin controls and strong data security.
  • A Great User Experience: The work chat app should be easy enough for your entire team to adopt quickly without extensive training.

The 4 Best Free Alternatives to Slack

Now let’s take a look at some of the top free Slack alternatives and compare them.

1. Zenzap

Best for: Businesses that want a free work chat app that is more powerful and easier to use than Slack.

Zenzap is a professional work chat app that offers a uniquely powerful free plan and strikes the perfect balance between robust features and an intuitive user experience.

What Makes It a Great Free Slack Alternative:

  • Full Professional Experience: Zenzap’s free plan includes its entire professional feature set with unlimited users and, most importantly, unlimited message history. You get access to all the core tools a business needs, including essential admin controls, enterprise-grade security, and built-in task management.
  • Incredibly Easy to Use: Unlike Slack, which can feel overcomplicated, Zenzap’s interface is as intuitive as texting, meaning your team can start using it instantly, even if they’re not tech-savvy.
  • More Than Just Chat: With built-in tasks, you can turn any message into a to-do item, connecting conversations to accountable actions: a feature Slack lacks.
  • Connects to Your Tools: Zenzap integrates with the business tools your team already uses. You can get notifications from your finance tools, CRM, and other apps directly in your chat.

Keep in Mind:

The only limitations on the free plan are on the total amount of file storage and access to some advanced privacy controls, but there are no user limits or group chat limits, and all essential communication and security features are included.

2. Microsoft Teams

Suitable for: Businesses that need a free, feature-rich platform and don’t mind a complex interface.

Microsoft Teams is a massive, all-in-one communication platform, and its free version is one of the most generous available.

Pros:

  • Decent Free Plan: The free plan for Microsoft Teams offers unlimited chat and message history, robust video conferencing, and a decent amount of file storage.
  • It’s a Powerful All-in-One Tool: For businesses that need a heavy-duty platform without a price tag, it’s hard to beat the sheer volume of what Teams offers for free.

Cons: 

Teams was built for large corporations, and it feels that way. The “hidden cost” of the free plan is its clunkiness. The interface is often described as cluttered and confusing, making it a frustrating experience for teams looking for a simple work chat app.

3. Pumble

Suitable for: Businesses that want the exact look and feel of Slack, but without the message history limits.

Pumble is a work chat app designed specifically to be a direct alternative to Slack, with its main selling point being a more generous free plan.

Pros:

  • Unlimited Message History: Pumble directly solves Slack’s biggest free plan problem. For businesses on a budget who need to keep their records, this is a huge advantage.
  • Familiar Interface: The app is a near-perfect copy of Slack, so if your team is already familiar with that layout, there is virtually no learning curve.

Cons:

As a tool built to imitate another, it may lag behind on innovation, and its library of third-party app integrations is much smaller than Slack’s. It lacks the polish of a more established platform.

4. Google Chat

Suitable for: Teams already in Google Workspace who need a very simple, no-cost tool for direct messages.

Google Chat is the basic messaging function built directly into the Google ecosystem.

Pros:

  • Simple and Built-in: For teams already working in Gmail all day, Google Chat is right there, requires no setup, and offers unlimited message history.
  • Included in Workspace: It’s included with any personal Google account or a paid Google Workspace subscription, so there are no extra costs.

Cons:

Google Chat is too basic to be a true replacement for a professional team chat app like Slack. It solves the message history problem but sacrifices almost all of the organizational and productivity features that businesses need.

Choose the Best Slack Alternative for Your Team

When looking for a free alternative to Slack, the goal is to find a platform you can actually build your business on. A free plan that deletes your data or is too confusing to use isn’t a real solution.

While each tool on this list solves the message history problem, Zenzap is the only one that also delivers a complete, professional feature set with unlimited users in a package that’s genuinely easy to use. Zenzap is the best free Slack alternative because it’s not a limited trial or a basic add-on; it’s a true foundation for your business’s growth.