Mira by Pirros is an AI agent that lives inside Revit. Ask it questions in plain English, tell it to make changes to your model, or have it generate new content for you — Mira understands your selection, executes the work, and verifies the result with a screenshot.
Free to download and use. Mira is free to install and start chatting with, with a usage cap. If you need more, upgrade to a plan for a higher allowance.
Requirements: Mira runs on Revit 2025, 2026, and 2027 on Windows. It is not available for Revit 2024 or earlier.
Availability: Currently available in the US, Canada, UK, Mexico, Australia/New Zealand, and Italy. Sign-in from other regions is not supported at this time. If you're outside these regions, contact [email protected] to be notified when your region is added.
Mira and the Pirros Revit plugin are different products. Mira is an AI agent that works on your model. The Pirros plugin brings your firm's detail and family library into Revit. They have separate installers, separate Revit version support, and you can run both at the same time — neither requires the other.
Mira has no admin role and no firm-level permission model. If Mira asks you to allow something, that's Mira's own tool-permission prompt — click Allow. It is not a Windows prompt, it needs no administrator rights, and you don't need to contact IT or a Pirros administrator. See Mira Tool Permissions: What the "Allow" Prompts Mean.
What Mira Does
Mira is built around three core capabilities — what we call Learn, Control, Create.
Learn. Ask Mira about anything in your model or about Revit itself. "Why is this wall hosting in the wrong location?" "What's the difference between a wall type and a wall family?" "Show me everything connected to this beam." Mira reads your model, your active selection, and Revit's documentation and explains in plain language.
Control. Tell Mira to make changes and it executes them for you. "Duplicate this cabinet type and make it 6 inches taller." "Swap every instance of Wall Type A with Wall Type B on Level 2." "Rename these views to follow the [Discipline]_[Level]_[Name] convention." Mira performs the action, then captures an after-screenshot so you can verify the result before saving.
Create. Generate new content from a description. "Create a kitchen layout with a 36-inch island." "Lay out parking stalls along this path with 9-foot spacing." "Build a typical curtain wall mullion family at this profile." Mira drafts the geometry, places it in your model, and lets you iterate with follow-up instructions.
Getting Started
Before you start: confirm you're running Revit 2025 or newer. Mira will not appear in older versions.
Visit mira.pirros.com
Click Start for free to download the Mira installer
Run the installer and restart Revit
Open Revit and find the Add-Ins tab — click it to open the menu.
You'll see Mira by Pirros — click it and start chatting.
Sign in with your Pirros account (the same login you use for the main Pirros web app)
If your firm doesn't have a Pirros account yet, you can still create a free Mira account at the same URL.
Can't find Mira after installing, or can't sign in? See Mira Troubleshooting: Not Appearing in Revit, Sign-In Problems, and Crashes.
An Example Conversation
Here's a real interaction to give you a feel for how Mira works:
You: "I have selected 2 base cabinets that are too short for the countertop. Can you duplicate the type and make it taller to be flush with cabinet? Similar to the 36" Type"
Mira: "I'll duplicate the 48" type, set the height to 2'-10 1/2" to match the 36" type, and swap the two selected cabinets to the new type." (executes)
Mira: "The new type was created and both cabinets have been swapped. Let me capture an after image to verify the change." (screenshots the result)
Notice that Mira reads your selection, proposes a plan, executes it, and proves the result. You stay in control — every change is in your active Revit session and you can undo it the same way you'd undo any other Revit action.
Credits and Plans
Mira is free to install and free to use up to a usage cap. Usage is metered in credits — each conversation consumes credits based on how much work Mira does (reading your model, generating responses, executing actions, capturing screenshots).
Everyone starts on the Free plan. If you reach your cap and want a higher allowance, upgrade to Pro or Max.
In the Mira chat panel, click your avatar in the top-right
Click Credits to see your current usage and your plan
Choose a plan from there to raise your allowance
Plan | Price | Usage |
Free | $0 | Limited Usage |
Pro | $19/month | 5x the Free Tier Usage |
Max | $99/month | 30x the Free Tier Usage |
How Mira Stays Safe
A few design choices worth knowing:
Mira works in your live Revit session. Every change is something you could have done by hand. You can undo, save, or discard exactly as you would normally.
Plan, then execute. For multi-step actions, Mira describes what it's about to do before running it. You can interrupt at any point.
You approve anything that changes something. Reading your model is silent; changing it asks first. Some actions ask every single time and cannot be set to "always allow" — see Mira Tool Permissions.
After-screenshots. Mira captures a verification image after most changes so you can confirm the result without flipping views.
Your data stays yours. Conversations and selections are processed by Mira's AI to respond to your requests. Pirros does not use your model content to train models for other firms.
Tips for Better Results
Select first, then ask. Mira reads your active selection, so selecting the elements you want to change before asking gives much better results.
Be specific about units. "6 inches taller" is better than "a bit taller." Numeric targets cut down on iteration.
Use Mira to learn Revit. If you don't know how something works, ask Mira to explain it. Often faster than searching the documentation.
Iterate. If the first result isn't right, follow up with "make it 2 inches shorter" or "do the same for these other 4 cabinets." Mira keeps context within a conversation.
Frequently Asked Questions
Q: Which Revit versions are supported?
A: Mira supports Revit 2025, 2026, and 2027. It is not available for Revit 2024 or earlier. Note that this is narrower than the Pirros Revit plugin's version support — the two products have separate installers, so the plugin working in an older Revit does not mean Mira will.
Q: Is Mira available in my country?
A: Mira is currently available in the US, Canada, UK, Mexico, Australia/New Zealand, and Italy only. Sign-in from other regions is not supported at this time. Contact [email protected] to be notified when your region is added.
Q: Do I need a paid Pirros plan to use Mira?
A: No. Mira is free to download and free to use up to its usage cap, and it works without a paid Pirros subscription — just sign up at mira.pirros.com. Mira's Free, Pro, and Max plans are separate from your firm's Pirros subscription.
Q: How are credits priced?
A: Credits track usage — simple "Learn" questions cost less than complex multi-step "Control" or "Create" actions, since the latter involves more reading, more model interaction, and screenshot generation. You can see your current usage from the Mira chat panel.
Q: What happens when I reach my usage cap?
A: Mira will pause and let you know. Your conversation context is preserved — upgrade to Pro or Max and you can continue exactly where you left off.
Q: Can I change or cancel my plan?
A: Yes. Pro and Max are monthly plans you can change at any time from the Credits screen in the Mira chat panel.
Q: Can Mira make changes I didn't ask for?
A: No. Mira only executes the actions described in its plan. For anything that touches multiple elements or modifies family types, Mira spells out the plan first so you can confirm or adjust before it runs.
Q: Is my model data sent off my computer?
A: Relevant context (your active selection, view, and the questions you ask) is sent to Mira's AI to generate responses. Your full model is not uploaded. Pirros doesn't use customer model content to train models for other firms.
Q: Does Mira work alongside the regular Pirros plugin?
A: Yes. Mira and the Pirros plugin are separate installs and run independently. You can use both at the same time, and installing one does not affect the other.
Q: Where do I report a bug or request a feature?
A: Use the chat icon inside Mira or email [email protected]. We log every interaction for quality and use them to improve responses — your feedback directly trains future improvements.
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