AI diagram generator for Slack: from thread to architecture diagram

AI diagram generators are good at the first draft. The problem is everything after it: the diagram sits in a separate tab, the team keeps talking in Slack, and a week later the two disagree.

Direct answer: Arialine is an AI diagram generator that works inside Slack. Mention @arialine with a description (or type /arialine and describe it), and it writes Mermaid, validates it and posts the diagram in the channel as a PNG and interactive HTML. Replies in the thread edit the same diagram, and each change is saved as a version linked to the message that asked for it.

Generate a diagram from one sentence

@arialine architecture diagram: web app and mobile app call an API gateway; the gateway routes to auth, catalog and orders services; orders writes to Postgres and publishes to a Kafka topic consumed by billing

Arialine picks a suitable Mermaid diagram type, writes the source, checks it with the renderer and posts it. Good prompts name the components, the direction of calls, and any failure paths. See better prompts for Slack diagrams.

Generate it from the discussion instead

If the design was just discussed in a thread, you don't need to retype it:

@arialine turn this into a diagram

Arialine reads the relevant recent discussion in that conversation and asks which topic you mean when two are plausible. It only reads messages when you address it.

Keep it correct as the thread continues

• "@arialine add a Redis cache in front of catalog" → version 2.
• "@arialine undo the last change" → version 3, same content as version 1; nothing is erased.
• Brainstorm: ask for alternatives and adopt one in place or as a branch.
• In proposal mode, changes wait for Apply, so a reviewer stays in control.

Why generate diagrams as Mermaid

Mermaid is text, so the result is editable, diffable and exportable. You can paste your own Mermaid too; valid code renders without AI.

What it generates well

Architecture and service maps, flowcharts, sequence diagrams, state machines, ER diagrams, Gantt timelines and C4 views. Always review AI output before relying on it.

FAQ

Is my Slack content used to train models?

Arialine does not use Slack content to train AI models. Requested features send the relevant instruction and context to configured AI providers; see the Privacy Policy.

How many AI generations are included?

Free workspaces get 10 AI generations per day; Team has no cap. One request counts once, even if several model calls are needed.

Can it generate from a whiteboard photo?

Describe the photo or use the whiteboard photo to Mermaid workflow.