A Miro alternative for Slack teams: one flat price instead of per-seat boards

Miro is an excellent whiteboard. But many engineering teams use it for one narrow job: drawing the architecture or flow that was just agreed in a Slack thread. For that job you pay per seat, and editing from Slack needs Slackbot on a higher Slack plan.

Direct answer: For technical diagrams maintained in Slack, Arialine is a Miro alternative with one flat price per workspace ($50 a month for everyone, or a Free plan with every feature) that works on every Slack plan. Miro costs $8–$20 per member per month (billed yearly), and asking Slackbot to change Miro boards requires Slack Business+ (15 Slackbot messages per member per week) or Enterprise+. Keep Miro if you need freeform workshops.

The cost of "draw it in Miro" for a Slack team

Team size	Miro Starter ($8/member)	Miro Business ($20/member)	Arialine Team
10 people	$80 / month	$200 / month	$50 / month
25 people	$200 / month	$500 / month	$50 / month
50 people	$400 / month	$1,000 / month	$50 / month

US list prices billed yearly, reviewed September 24, 2026. Not everyone needs a Miro seat, so your bill may be lower; the point is that it grows with each person who edits.

If you also want to edit diagrams by asking Slackbot, add a Slack Business+ or Enterprise+ plan for everyone who does.

What you get instead

• Create in the thread: /arialine and paste Mermaid, or @arialine draw the checkout flow: API → payments → fulfillment.
• Edit in the thread: anyone replies @arialine add a fraud check before payment; no account or seat needed.
• History: every change is a version with Undo, Rewind, Branch and a link to the message that asked for it.
• Share anywhere: PNG, interactive HTML, SVG, .mmd and PDF reports.

What you give up

Freeform canvas, sticky notes, workshop templates and dragging shapes by hand. Arialine diagrams are Mermaid: great for systems and flows, not for brainstorming walls. Many teams keep one Miro seat for the facilitator and move technical diagrams to Arialine.

Move a diagram over

There is no Miro importer. Write the agreed components as a sentence or Mermaid, type /arialine, and review the result. See Arialine vs Miro and the Slack Miro integration guide.

Sources

Miro pricing, Slackbot limits and credit usage, Connect Slackbot to other apps with MCP, Arialine pricing.