Best 7 Team Chat Software in 2026: Compared for Every Team Size

Introduction

Slack is the best overall team chat software for most teams, thanks to its integrations and channel structure. This list covers seven tools, from big-suite options to budget and self-hosted picks. They span free plans, secure options, and different team sizes.

Quick comparison table

The tools range from free-focused (Pumble) to suite-bundled (Microsoft Teams, Google Chat). Slack, Microsoft Teams, and Mattermost offer an API. Mattermost is the one you can self-host.

Pricing labels are general, so check each vendor's current plans before buying.

1. Slack

Best for: teams that live in channels and rely on many third-party apps.

Slack organizes conversation into channels, with file sharing and calls built in. What sets it apart is the range of third-party integrations, which lets it sit at the center of a lot of workflows. It runs on Web, Desktop, iOS, and Android, and has an API. A 2026 roundup of team chat apps for business named it too.

2. Microsoft Teams

Best for: companies already using Microsoft 365.

Microsoft Teams puts team channels, meetings, and file sharing in one place. The big draw is chat and meetings in a single app, so you don't switch tools for a call. It works on Web, Desktop, iOS, and Android, and offers an API. It also shows up in 2026 business chat roundups.

3. Google Chat

Best for: teams already on Google Workspace.

Google Chat handles direct messages and spaces, where groups collaborate around a topic or project. Its best feature is how well spaces tie into the rest of Workspace. It's available on Web, iOS, and Android. No desktop app is listed. A 2026 roundup of team chat apps listed it first.

4. Troop Messenger

Best for: organizations that prioritize secure communication.

Troop Messenger is a business chat app with audio and video calling plus screen sharing. The built-in calling and screen sharing are aimed at secure use, so you don't need a separate meeting tool. It runs on Web, Desktop, iOS, and Android. A 2026 roundup lists it as a secure option.

5. Pumble

Best for: small teams and budget-conscious startups.

Pumble is a team chat app with a free plan. Its best feature is unlimited message history on that free plan. Many free tiers elsewhere cap history, so this matters if you search old conversations often. It runs on Web, Desktop, iOS, and Android. A 2026 roundup lists it as budget-friendly.

6. Brosix

Best for: small businesses wanting secure chat with remote support tools.

Brosix is a secure business chat tool that includes screen sharing. Its best feature is remote desktop access, handy when you need to help a colleague or client directly on their machine. It's available on Web, Desktop, iOS, and Android. Check its security details against your own requirements before committing.

7. Mattermost

Best for: teams needing self-hosted control over their data.

Mattermost is a team messaging platform built for secure collaboration. Its main feature is self-hosting, so your messages live on infrastructure you control. It runs on Web, Desktop, iOS, and Android, and has an API. The trade-off is that self-hosting takes technical resources to set up and maintain.

How we picked these tools

We looked at core chat features, platform coverage, security focus, and price range. The list mixes suite-bundled, standalone, budget, and self-hosted tools. Some picks draw on mentions in 2026 roundups. No tool here is sponsored or owned by us.

Frequently asked questions

What is team chat software, and how is it different from email?

Team chat software gives groups real-time messaging in channels or spaces, usually with file sharing and calls. Email is slower and better for formal, external messages.

Is there good free team chat software?

Yes. Pumble offers unlimited message history on its free plan, which is a rare perk for a free tier. Slack, Teams, and Google Chat also have free options, so compare limits.

Which option is best for security-focused teams?

Mattermost suits teams that want to self-host. Troop Messenger and Brosix are also positioned around secure communication.

Should I pick Teams or Google Chat if I already use a suite?

Usually, yes. Pick whichever matches your suite. Teams fits Microsoft 365, and Google Chat fits Workspace.

The verdict

Slack is the strongest overall pick on merit, thanks to its integrations and channel-based workflow. Microsoft Teams is the runner-up for Microsoft 365 companies. Pumble is the runner-up for tight budgets, and Mattermost for self-hosting needs.

Rule of thumb: match the tool to the suite or security needs you already have.