Building analysis and design that shows its work.
Open your ETABS models in the browser. Every CSA, ACI and AISC check prints the clause and the formula with your numbers in it, and the solver passes CSI's own ETABS and SAFE verification problems before each release.
Tested on the problems ETABS is verified on.
CSI publishes the problems ETABS and SAFE are checked against. We rebuilt every linear one as a release test, and a deploy stops if any of them falls outside its tolerance. Frames and shells were also compared once against OpenSees. See every benchmark.
CSI ETABS frame verification checks pass at a 0.5% tolerance
SAFE plate verification checks pass at a 5% tolerance
relative difference from OpenSees on frame statics, modes and seismic loads (one-time comparison)
to solve 37,248 equations (modes and two spectrum cases) in the browser on an Apple M3 Max laptop
Every number traces back to a clause.
Each design check prints the clause, the formula with your numbers in it, and the result. After every run, gravity totals, base shear, wind, spectrum scaling and drift are recomputed by hand, independently of the solver.
Calculation sheets you can hand-check
Biaxial P–M–M by strain compatibility on the real section, including L, C, T and box walls. Bar-by-bar strains, the shear method used, and what is not checked.
Walls and slabs as real shell elements
A 30-storey core-wall tower, 15,030 equations, about 5 seconds in the browser.
Independent checks after every run
Gravity, base shear, wind, spectrum scaling, drift and deflection, recomputed by hand after every run.
Parametric studies in a few lines
numpy, pandas and matplotlib inside the app, offline.
Opens your ETABS models
.e2k in the browser; .EDB and side-by-side comparison in the Windows app.
More than 12,000 steel shapes from 11 regions
AISC, CISC, EN, IS 808, BS, AS/NZS, GB, JIS, KS, Nordic and GOST shapes and 161 material grades, each with its source.
Ask in plain English. Watch it edit the model.
A real session on a 25-storey podium-and-twin-tower model, sped up. Four requests: diagnose the failing checks, add shear walls, rescale the spectrum, show the result. Every edit is shown and undoable.
A five-storey office, analysed and strength-checked in seconds
Most projects aren't towers. A typical concrete moment-frame office (4 × 3 bays, five storeys, ASCE 7 seismic and wind, response spectrum) analyses in under half a second in the browser, and all 255 beams and columns are checked to ACI 318-19 with utilisation shown on the model. Seismic detailing is listed as not checked, for the engineer to review.
- Gravity, ELF, wind and response spectrum cases with code combinations
- Concrete beam steel areas and column interaction checks
- Drift, deflection and hand-check report on every run
From ETABS model to calc package.
Bring the model you already have. Leave with a printable package.
Open
Import .e2k models, or .EDB through ETABS on Windows. Units, auto lateral loads and combinations come with them.
Analyse & ask
Run gravity, ELF, wind and spectrum cases. Ask the assistant why drift changed, or have it make the fix.
Package
One PDF: cover, model summary, loads, results, checks, design tables and every calculation sheet.
Bring your next building.
Free during the beta. Send us an ETABS model and we'll help you run it in both programs and compare the results.