Structural engineering, in the browser

Analysis that shows its work.

Fifteen tools for sections, steel, concrete, frames, footings, and wind — every result cited to the code reference that produced it.

14-day free trial, no card required — pick your plan below

ACI 318-19 / -14
ACI 440.11-22
AISC 360-16
AISC 370
AISC Design Guide 9
ASCE 7-10 / -16 / -22

Fiber engine · live replay

308 fibers · 8 bars · f′c 4 ksi · fy 60 ksi

kip

φ 2.7e-4 · M 516 k·ft · c 6.5 in

Not a mockup — precomputed by the production fiber engine for an 18×24 in column, replayed here.

Real output, replayed live

Everything below was computed by the same server-side engines the tools run — nothing is illustrated, mocked, or approximated.

Biaxial P-M-M, per ACI 318-19 / 318-14

Open P-M-M →

Interaction diagram · θ = 0°

nominal + φ-factored

Pu 450 kip · Mux 390 k·ft → DCR 0.92 ✓

Biaxial capacity · φPn = 450 kip

Mx–My plane

Pu 450 kip · Mux 180 · Muy 90 k·ft → DCR 0.61 ✓

Steel members, every check cited — AISC 360-16

Open W-Shape Design →

AISC 360-16 design check · live replay

Pu 110 kip · Mux 165 k·ft · Vu 42 kip · Lb 14 ft · ASTM A992

Try a shape

Compression Ch. E

0.35φPn = 310 kip

Flexure (major) Sect. F2

0.61φMn = 272 k·ft

Shear Sect. G2.1

0.22φVn = 192 kip

Combined Eq. H1-1a

0.90Pr/Pc = 0.35

PASS · DCR 0.90

every value cites its equation in the calc package

Mn vs. unbraced length

Sect. F2 · inelastic LTB at Lb = 14 ft

3D frame model with bending-moment diagrams drawn on every member

actual output

Frame Analysis 3D

3D frames with P-Δ, response spectrum, and steel design — diagrams on every member.

Animated topology optimization run: material distribution evolving into an optimal bracing pattern

actual run

2.5D Topology Optimization

Variable-thickness topology optimization, converging live in the browser.

Fifteen tools, one workbench

One subscription, one section builder, one project store — shared by every tool.

Steel design

AISC 360 / 370

Stainless Steel W-Shape DesignStainless W-shapes to AISC 370, every value cited to its code reference.Structural Steel W-Shape DesignW-shapes to AISC 360-16, including Design Guide 9 torsion.Structural Steel HSS DesignRectangular and round HSS, including closed-section torsion per H3.Eccentric Weld Group AnalysisEccentric weld groups by the elastic and IC methods, side by side.

Concrete design

ACI 318 / 440

P-M-M Interaction (ACI 318)The full biaxial φPn–Mnx–Mny surface, with a DCR for every load case.P-M-M Interaction (ACI 440 GFRP)The same surface for GFRP bars — ACI 440.11-22 limit states and φ factors.Isolated Spread Footing DesignBearing, one-way and punching shear — column anywhere on the pad.Reinforced Concrete Beam DesignFlexure, shear, torsion, and spacing at a critical section.Reinforced Concrete Column DesignTied and spiral columns: P-M-M, min/max steel, tie and shear design.Strut-and-Tie DesignDraw a D-region truss and check every strut, tie and node to ACI 318 Chapter 23.

Structural analysis

Frames and optimization

2.5D Topology OptimizationVariable-thickness topology optimization, converging live in the browser.Frame Analysis 3D3D frames with P-Δ, response spectrum, and steel design — diagrams on every member.

Section analysis

Geometry and response

Moment-Curvature AnalysisFiber M-φ from first crack to failure — any shape, rebar, or material.Section PropertiesElastic, plastic, and FE torsion/warping properties for shapes with no formula.

Loads

ASCE 7

Components & Cladding Wind Loads34 C&C procedures across three ASCE 7 editions — zones located from geometry.

Model

Parametric shapes, rebar patterns, the full AISC library, paste-from-Excel.

Run

Verified engines compute server-side — results in seconds, nothing installed.

Deliver

PDF calc packages that cite the governing code reference next to every number.

A verified engine

Every solver is checked against closed-form solutions or industry standard software.

Every number cites its code reference

Eq. H1-1a printed next to the value it produced. Reviews go faster when nothing is a black box.

Projects follow you

Save to the cloud and reopen mid-model from the office, home, or site — deep links included.

Exports that leave with you

PDF calc packages, CSV curves, STL geometry — plus an API on Ultimate plans.

One subscription, sized to your practice

Three tiers, from member design to the full analysis suite. Signing up starts a 14-day free trial of every tool.

Basic

Stainless steel W-shape design to AISC 370.

$49/mo

billed monthly

✓Stainless Steel W-Shape Design (AISC 370)
✓Isolated Spread Footing Design (ACI 318)
✓Structural Steel W-Shape Design (AISC 360)
✓Section Properties
✓Reinforced Concrete Beam Design (ACI 318)
✓Structural Steel HSS Design (AISC 360)
✓Unlimited saved projects, synced to your account
✓Cancel anytime

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Pro

Everything in Basic, plus P-M-M interaction and DCR checks to ACI 318.

$89/mo

billed monthly

✓Everything in Basic, plus:
✓P-M-M Interaction (ACI 318)
✓Eccentric Weld Group Analysis (AISC 360)
✓Reinforced Concrete Column Design (ACI 318)
✓Cancel anytime

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Ultimate

Every tool, plus API access for programmatic use.

$149/mo

billed monthly

✓Everything in Pro, plus:
✓Moment-Curvature Analysis
✓2.5D Topology Optimization
✓P-M-M Interaction (ACI 440 GFRP)
✓Frame Analysis 3D
✓Components & Cladding Wind Loads (ASCE 7)
✓Strut-and-Tie Design (ACI 318)
✓API access
✓Cancel anytime

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Compare plans in detail

See exactly what's included in each plan.

Feature	Basic$49/mo	Pro$89/mo	Ultimate$149/mo
Tools
Stainless Steel W-Shape Design (AISC 370)	✓	✓	✓
Structural Steel W-Shape Design (AISC 360)	✓	✓	✓
Structural Steel HSS Design (AISC 360)	✓	✓	✓
Isolated Spread Footing Design (ACI 318)	✓	✓	✓
Reinforced Concrete Beam Design (ACI 318)	✓	✓	✓
Section Properties	✓	✓	✓
P-M-M Interaction (ACI 318)	—	✓	✓
Eccentric Weld Group Analysis (AISC 360)	—	✓	✓
Reinforced Concrete Column Design (ACI 318)	—	✓	✓
Moment-Curvature Analysis	—	—	✓
P-M-M Interaction (ACI 440 GFRP)	—	—	✓
2.5D Topology Optimization	—	—	✓
Frame Analysis 3D	—	—	✓
Components & Cladding Wind Loads (ASCE 7)	—	—	✓
Strut-and-Tie Design (ACI 318)	—	—	✓
Advanced
API access	—	—	✓

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