Free Trial
Trial
$0 / 14 days
Full access to the Design Assistant for 14 days. No credit card required to get started.

  • 20 AI Design Assistant messages
  • 1 active project
  • All calculation modules
  • PDF report export
  • CSV & markdown exports
  • 60+ free calculators (always free)
Start Free Trial
Starter
Starter
$19 / mo
For individual engineers working on active projects every month.

  • 100 AI messages per month
  • Up to 5 active projects
  • All calculation modules
  • PDF, CSV & markdown exports
  • 60+ free calculators
  • Email support
Get Started
Firm
Firm
$149 / mo
For small firms with multiple engineers working on projects together.

  • 2,000 AI messages per month
  • Unlimited projects
  • Up to 5 team seats
  • All exports
  • 60+ free calculators
  • Priority support
Get Started

Frequently asked questions

Do I need a credit card to start the free trial?
No. The 14-day trial requires no credit card. You only need to provide payment information when you decide to upgrade to a paid plan.
What happens when my trial ends?
When your trial expires, your account is paused and you can no longer use the AI Design Assistant. Your project data is retained. You can upgrade to a paid plan at any time to restore access.
Are the free calculators really free forever?
Yes. The 60+ free HVAC calculators on the tools page require no account and have no usage limits. They will always be free.
What counts as an AI message?
Each time you send a message to the AI Design Assistant and receive a response, that counts as one message. Viewing your project, running calculations, and using the free tools do not count against your limit.
Can I upgrade or downgrade my plan?
Yes. You can upgrade, downgrade, or cancel your subscription at any time from your account's billing portal. Changes take effect at the start of the next billing cycle.
What is the Firm plan's team seat feature?
The Firm plan allows up to 5 individual user accounts that share the monthly AI message pool. Full team seat management is coming soon — contact us to set up a Firm account today.

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