Compare/Head to head

MirrorFly vs Slack

Same facts, side by side: starting price, free tier, MCP, API and what each one is actually built for.

Starting price

MirrorFly

Quote

MirrorFly is a build kit for companies that want their own branded, self-hosted chat and calling app rather than renting Slack or Teams. It is sold as a one-time license by quote, so it suits organisations with developers and strict data-control needs, not a recruiting team looking for a ready-made tool.

Where MirrorFly fits

  • Companies that must keep chat and call data on their own servers
  • Teams building a branded messaging or calling app
  • Regulated sectors such as healthcare, banking and government

Slack

$8.75/user/mo Free tier

Slack is the channel-based chat app many companies already run their day on. There is a free plan, Pro is $8.75 per user a month and Business+ is $18, billed monthly, with about 16% off on annual billing. As internal communications software it suits desk teams talking in real time; it is not an intranet or a company newsfeed.

Where Slack fits

  • Desk-based teams that talk in real time
  • Companies that want other comms tools to post into one chat app
  • Teams connecting AI assistants to their workspace

At a glance

DetailMirrorFlySlack
Starting priceQuote$8.75/user/mo
Free tier–No✓Yes
MCP server–No✓Yes
Public API✓Yes✓Yes
Listed underInternal communicationsInternal communications
CapterraNot enough reviews4.7 from 24,167 reviews

Where they pull apart

MirrorFly

Stands out: You own it: MirrorFly is licensed once rather than per user per month, can run entirely on your own servers or private cloud, and comes with optional full source code, so chat and call data never has to leave your infrastructure.

Watch out: There is no published price, no free trial and no free plan, only a demo. It is a developer product: you get SDKs, a UI kit and a white-label app to build on, so expect a project to launch it rather than a sign-up and go.

Not the right fit for

  • Small teams that want team chat working today
  • Buyers who need a published price list
  • Recruiters looking for candidate texting or messaging tools

Slack

Stands out: It is the chat app most other workplace tools already connect to, and Slack runs its own MCP server, so an AI assistant can search channels, read threads and post messages for you with your existing permissions.

Watch out: Slack is built for conversation more than broadcast: there is no intranet or company newsfeed, and channel posting controls beyond #general need Business+. The free plan keeps only 90 days of history, and AI search and Slackbot also need Business+.

Not the right fit for

  • Comms teams that need a branded intranet and newsletters
  • Frontline-heavy workforces that want a mobile-first comms app out of the box
  • Companies standardised on Microsoft 365 and Teams

Pros and cons

MirrorFly

  • One-time license, no per-user monthly fees
  • Runs fully on your own servers
  • Full source code and white-labeling available
  • No published pricing
  • No free trial or free plan
  • Needs developers to launch

Slack

  • Free plan with no time limit
  • Official MCP server for AI assistants
  • Large app marketplace and Workflow Builder
  • Free plan keeps only 90 days of history
  • AI search and Slackbot need Business+
  • No intranet or company newsfeed

What each one costs

MirrorFly

Quote

MirrorFly does not publish prices. Its self-hosted product is sold as a one-time lifetime license priced to each customer's requirements, with no separate charges for file storage or transfer. Screen sharing, call recording and live streaming are listed as optional extras, and source code access is optional. There is no free trial or free plan; the vendor offers a free demo instead. Confirm current terms on the vendor site.

Checked 10 Nov 2026

Slack

$8.75/user/mo

Slack has a free plan with 90 days of message history and up to 10 app integrations. Pro is $8.75 per user per month billed monthly and adds unlimited history and AI thread summaries. Business+ is $18 per user per month billed monthly and adds AI search, Slackbot, SAML single sign-on and SCIM. Annual billing saves about 16% on both. Enterprise+ is quoted by sales. Confirm current terms on the vendor site.

Checked 22 Oct 2026

Common questions

Can you try MirrorFly or Slack for free?
Slack carries a free tier on our listing.
Does MirrorFly or Slack have an MCP server?
Slack ships a first party MCP server, so an AI assistant can work the product directly.

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Editorial listings, never paid rankings. Prices checked 10 Nov 2026. Confirm current terms on the vendor site. Spot an error?