The structural calculator library built for engineering you can defend
200+ standards-aligned calculators used by 3,000+ engineers every month. Load linking propagates changes automatically.
Every plan starts with a 14-day free trial at Pro level. No credit card required, nothing to cancel.
Basic
US$66/mo
billed US$790 annually
Choose this if you are a solo engineer on residential or smaller commercial projects: timber, steel, cold-formed steel, and concrete member design to US standards.
- Wood and steel beam and column calculators to NDS and AISC
- Cold-formed steel (CFS) beam and column calculators to AISI S100
- Concrete footings calculators to ACI 318
- Beam and diaphragm analysis
- Professional PDF reports with your logo
Most popular
Pro
US$99/mo
billed US$1,190 annually
Choose this if your projects involve lateral systems, shear walls, retaining walls, or wind and seismic design. Full US calculator library with ASCE 7 load generation.
- Everything in Basic, plus:
- Concrete beam and column calculators to ACI 318
- Shear wall, masonry, and retaining wall calculators
- Wind, snow, and seismic analysis to ASCE 7
- Portal frame and truss analysis (2D FEA)
Ultimate
US$124/mo
billed US$1,490 annually
Choose this if your practice needs personalised onboarding, custom-branded PDFs, API access, and priority engineering support.
- Everything in Pro, plus:
- Priority support
- Personalised demo and 1-hour onboarding
- API access
- Custom PDF uploads
What engineers say
Yes, it costs money, but you spend money to make money, and the money you make is based on the time you save.
Matt Ward
Principal Engineer, Ward Engineering
Structural EngineeringRead their story →
The software has made us a minimum of 30% more productive. It's eliminated at least 30% of the workload.
Donovan Rae
Senior Project Manager, Lumos & Associates
Structural EngineeringRead their story →
We've seen a big improvement in efficiency, saving 10-20% of the time on calculations.
Richard Faulkner
Senior Structural Engineer, Kusch Consulting Engineers
Structural EngineeringRead their story →
Compare plans in detail
See exactly what is included in each plan to find the right fit for your needs.
| Feature | Basic | Pro | Ultimate |
|---|---|---|---|
Calculator library | |||
| Wood beam calculators (NDS) | |||
| Wood column calculators (NDS) | |||
| Steel beam calculators (AISC 360) | |||
| Steel column calculators (AISC 360) | |||
| Cold-formed steel beam calculators (AISI S100) | |||
| Cold-formed steel column calculators (AISI S100) | |||
| Concrete footing calculators (ACI 318) | |||
| Beam analysis | |||
| Diaphragm analysis | |||
| Concrete beam calculators (ACI 318) | |||
| Concrete column calculators (ACI 318) | |||
| Shear wall calculators | |||
| Masonry calculators | |||
| Retaining wall calculators | |||
| Wind, snow, and seismic analysis (ASCE 7) | |||
| Portal frame analysis (2D FEA) | |||
| Truss analysis (2D FEA) | |||
Projects and reports | |||
| Unlimited projects and calculations | |||
| Unlimited load linking between calculations | |||
| PDF export with company branding | |||
| Project templates and custom defaults | |||
| Custom PDF uploads | |||
Engineering support | |||
| Email support | |||
| Qualified engineering support | |||
| Priority support | |||
| Personalised demo and onboarding | |||
Advanced | |||
| API access | |||
Calculator library
BasicProUlt.
Wood beam calculators (NDS)
Wood column calculators (NDS)
Steel beam calculators (AISC 360)
Steel column calculators (AISC 360)
Cold-formed steel beam calculators (AISI S100)
Cold-formed steel column calculators (AISI S100)
Concrete footing calculators (ACI 318)
Beam analysis
Diaphragm analysis
Concrete beam calculators (ACI 318)
Concrete column calculators (ACI 318)
Shear wall calculators
Masonry calculators
Retaining wall calculators
Wind, snow, and seismic analysis (ASCE 7)
Portal frame analysis (2D FEA)
Truss analysis (2D FEA)
Projects and reports
BasicProUlt.
Unlimited projects and calculations
Unlimited load linking between calculations
PDF export with company branding
Project templates and custom defaults
Custom PDF uploads
Engineering support
BasicProUlt.
Email support
Qualified engineering support
Priority support
Personalised demo and onboarding
Advanced
BasicProUlt.
API access
Engineering student or lecturer?
We offer free academic plans for verified students and educators. Register with your institution email to get started.
Frequently asked questions
How long is the free trial?
Every plan starts with a 14-day free trial at Pro level - the full Pro calculator library with no restrictions. No credit card required. After your trial, your projects stay accessible on the free plan - there is nothing to cancel and no card saved.
What happens after the trial ends?
If you have not upgraded to a paid plan, your account moves to our free plan automatically. You keep access to all projects and calculations you have already created - you just need a paid plan to run new ones. All paid plans come with a 30-day money-back guarantee.
Can multiple team members share a plan?
Yes. All plans use a floating concurrency model - you can add as many named users as you like. The plan limit controls how many people can be logged in at the same time, not how many people have accounts. Billing and IT admin accounts do not count toward the limit.
Do you offer plans for engineering teams?
Yes, we build custom plans for engineering teams of 5 or more. Get in touch and we will put together something that fits your team size, standards, and workflow.Contact us about a team plan →
What is the difference between monthly and yearly billing?
Yearly billing saves you 17% compared to monthly - you pay for 10 months and get 12. Invoice payment is also available on annual plans, contact us to arrange.
What payment methods do you accept?
We accept all major credit cards. Invoice payment is available for annual plans - contact us to arrange.
Which standards are supported?
We support Australian (AS/NZS), US (AISC/ACI/NDS/ASCE), and Eurocode (EN) standards. The specific standards available vary by plan and calculator.
Start designing with calculations you can defend.
Free trial on every plan. No credit card required.