Free while we build it with you.
We're onboarding a small group of firms to shape Keystone. Beta access is free, and founding firms keep preferred pricing at launch.
Full access during the beta for invited engineers and firms.
- Web and Windows desktop app
- AI assistant and Python included
- Direct line to the team; your feedback sets priorities
On the roadmap
- ACI 318 Chapter 18 special walls and boundary elements
- Rigid end length offsets at beam–column joints
- Cloud projects, sharing and team history
- Reinforcement detailing and drawings, and a Revit round-trip
- Mac desktop app
- Published side-by-side comparisons with ETABS on real buildings
Already shipped: SAFE-style slab design (strips, punching shear with drop panels, studs and openings, cracked long-term deflection), mats and footings on soil, and SAFE model import.
Questions engineers ask.
Can I open my existing ETABS models?
Yes. In the browser, open an .e2k text export (ETABS: File → Export → ETABS .e2k Text File). In the Windows app you can also open .EDB files directly: Keystone uses your installed ETABS to convert them. Frames, walls, slabs, materials, library sections, loads, auto lateral loads, cases, spectra and combinations are imported, and anything not yet supported is listed clearly. The Windows app can also run ETABS on the same model and compare results side by side.
Which design codes are supported?
Loads: NBC 2020 and ASCE 7-16 (seismic, wind, combinations). Member design: CSA A23.3-19 concrete columns, walls (including Clause 21 ductile walls) and beams, CSA S16 steel, AISC 360-16 steel and ACI 318-19 concrete frames, each with step-by-step calculation sheets.
Which units can I use?
Metric (kN, m, mm, MPa) and U.S. customary (kip-ft or kip-in). Imported ETABS models keep their units, and exports use them too.
Where does my model go?
Analysis runs on your own computer, in the browser or the desktop app. If you use the AI assistant, the parts of the model and results it needs to answer are sent to the AI model for that request (the hosted beta uses OpenAI models through OpenRouter). You can turn the assistant off for any project (Assistant → Turn Off for This Project); the setting is saved with the model, and nothing from that project is sent anywhere. See the privacy notice.
How do I know the results are right?
Every release is tested against closed-form solutions and OpenSees (see Verification), and every analysis produces a hand-check report you can review and keep with your calculations.
Does it replace ETABS?
For linear analysis and design of frame and wall buildings, Keystone covers the core workflow and adds the assistant, scripting, calculation sheets and automatic checking. Nonlinear and time-history analysis, some design modules and detailing are on the roadmap. If you need to stay on ETABS, Keystone works with your ETABS models: open them to run the independent checks report or a second analysis, and export changes back. ETABS is a trademark of Computers and Structures, Inc.; Keystone is independent.
Windows, Mac, Linux?
The web version runs in any modern browser on any system. A Windows desktop app is available; Mac and Linux builds are planned.