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Mattermost vs Sideline

Professional comparison and analysis to help you choose the right software solution for your needs.

Mattermost icon
Mattermost
Sideline icon
Sideline

Mattermost vs Sideline: The Verdict

Last updated: May 2026 · Comparison by Sugggest Editorial Team

Feature Mattermost Sideline
Sugggest Score — —
Category Social & Communications Social & Communications
Pricing Freemium Subscription

Product Overview

Mattermost
Mattermost

Description: Mattermost is an open-source, self-hosted online chat service with file sharing, search and integration capabilities. It supports text, images, videos and custom emojis across PCs and phones with instant notifications.

Type: software

Pricing: Freemium

Sideline
Sideline

Description: Sideline is a phone app that provides users with a second phone number to keep their personal and work calls separate. It has features like call forwarding, voicemail transcripts, blocking contacts and more.

Type: software

Pricing: Subscription

Key Features Comparison

Mattermost
Mattermost Features
  • Team messaging
  • File sharing
  • Search
  • Integrations
  • Cross-platform support
Sideline
Sideline Features
  • Second phone number
  • Call forwarding
  • Voicemail transcripts
  • Blocking contacts
  • Conference calling
  • Call recording
  • Visual voicemail
  • Do not disturb mode

Pros & Cons Analysis

Mattermost
Mattermost
Pros
  • Open source
  • Self-hosted
  • Highly customizable
  • Strong security
  • Active development community
Cons
  • Requires technical expertise to setup and manage
  • Limited native mobile apps
  • Less third-party integrations than proprietary options
Sideline
Sideline
Pros
  • Keeps personal and work calls separate
  • Easy to set up and use
  • Affordable pricing
  • Good call quality
  • Useful features like voicemail transcripts
Cons
  • Mobile app only, no desktop app
  • Number porting can take time
  • Some features require premium plan
  • Limited international calling

Pricing Comparison

Mattermost
Mattermost
  • Freemium
Sideline
Sideline
  • Subscription

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Learn More About Each Product

Mattermost
Mattermost
Reviews, pricing & alternatives →
Sideline
Sideline
Reviews, pricing & alternatives →

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