Professional mechanical engineering tools
Simple, transparent pricing
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Free
Structural references & GD&T tools
$0forever
- Unit converter & reference library
- Steel sections calculator
- GD&T calculator
- Tolerance stack-up
- Comparison mode
- Unlimited calculations
Core
Every engineering calculator
$19/mo
- Everything in Free
- All 50 engineering calculators
- AI Engineering Assistant (10 q/hr)
- Save calculations, project workspaces & history
- Branded PDF reports
- Public read-only share links
- Material database & sensitivity charts
Most Popular
Pro
Calculators + the Design Studio
$39/mo
- Everything in Core
- Fluid-power, P&ID & electrical schematic editors
- Custom logo / white-label PDF reports
- AI Engineering Assistant (20 q/hr)
Expert
API access & professional scale
$69/mo
- Everything in Pro
- AI Engineering Assistant (50 q/hr)
- Full REST API access (self-serve keys)
- CAD add-in — Fusion 360 (coming soon), then Inventor & SolidWorks
- Dedicated priority support
Team
5–20 seats
$49/seat/mo
billed annually · volume pricing
Custom setup · pricing via email
- All 50 calculators + schematic editors
- Volume discounts for larger teams — pricing via email
- Priority email support
- SOONSeat management dashboard
- SOONShared calculation workspace
Enterprise
20+ seats
Custom
Volume pricing · On-premise option
- Unlimited seats
- SOONSSO / SAML integration
- SOONCustom tool configuration
- Dedicated SLA
- On-premise deployment (on request)