COSA / Reinforced concrete section design
Any section.Any load.A clearer check.
Geometry, reinforcement and loads. ULS and SLS checks. One workspace built around the way structural engineers work.
60-day full-suite evaluation by request
All features. Your own sections and loads. Request your free 60-day COSA evaluation licence through this page.
See the workflow
Spend your attention on the section. Not the spreadsheet.
Define the section.
Use parametric sections or bring arbitrary geometry and reinforcement in from DXF.
A better next step
Checking one section — or a whole project’s worth?
Explore the full COSA suite for 60 days with your own geometry, actions and reports. Then choose a paid plan for advanced workflows, or COSA Free for simple checks.
Choose your next step
Your workflow. Your plan.
All paid plans include the full feature set. Choose the activations you need.
Free
€0
1 activation
A focused version for simple, single-section checks.
- Rectangular, circular and T sections
- Single calculation only — SLS and ULS
- Up to 5 sections per project
- Fixed project parameters
- No arbitrary sections, batch analysis, envelopes or reports
One
€16+ VAT
/month
€192 billed annually · + VAT
Save 16% compared with monthly billing
1 activation
For individual engineers and independent consultants.
- All features, updates and support
For teams
Ten
€66+ VAT
/month
€792 billed annually · + VAT
Save 16% compared with monthly billing
Up to 10 activations
For structural-engineering teams and specialist consultancies.
- All features, updates and support
Unlimited
€166+ VAT
/month
€1,992 billed annually · + VAT
Save 17% compared with monthly billing
Organisation-wide
For larger consultancies deploying COSA across multiple teams.
- All features, updates and support
The 60-day evaluation is requested through the form on this page. It is separate from the one-week subscription checkout trial.
Secure payment, licence delivery and applicable VAT are handled through Gumroad. Prices shown are base prices; VAT is calculated at checkout.
Before you start
A few practical answers.
What can I do with COSA Free?
Check rectangular, circular and T sections with single ULS and SLS calculations. Projects are limited to five sections, with fixed project parameters. Arbitrary sections, batch analysis, envelopes and reports require a paid plan.
How does the 60-day evaluation work?
Request it with your email. fr.aime labs will email a full-suite evaluation licence valid for 60 days within two business days. No card is required. This offer is separate from the one-week subscription checkout trial. COSA Free remains available for simple single-section checks after the evaluation.
Which paid plan should I choose?
Every paid plan includes the full feature set. One provides one activation, Ten provides up to ten, and Unlimited covers organisation-wide use. Choose the number of activations you need.
Can I use my existing section geometry?
Paid plans support arbitrary geometry and reinforcement imported from DXF, including openings. Review the imported inputs before calculating.
COSA / Built for the work
Your next section is waiting.
Explore the full COSA suite for 60 days with your own geometry, actions and reports. Then choose a paid plan for advanced workflows, or COSA Free for simple checks.