Robot Structural Analysis vs ETABS: Which Should You Use?

Ask ten structural engineers which package they would pick for a twelve storey reinforced concrete tower and you will get a split room. Half will say ETABS without hesitating. The other half will point at Robot Structural Analysis Professional and talk about the Revit link. Both groups are right about their own work, and both tend to assume the other group has simply not tried the better tool.

That framing misses what actually separates these two. They are not two versions of the same idea with different buttons. ETABS was built around the way a building is organised, floor by floor, and almost everything in it assumes you are analysing a building. Robot was built as a general finite element solver that happens to be very good at buildings and also handles the tank, the mast and the industrial frame that ETABS was never shaped for. Pick the wrong one and you will spend your week fighting the software instead of the structure.

Robot Structural Analysis vs ETABS: how they compare

Six things decide this for most offices. Everything else is preference.

How each one thinks about a structure

Open a new model in ETABS and the first thing it asks about is stories. Heights, similar levels, what repeats. From that moment on the whole program speaks in storeys: storey drift, storey shears, storey forces, diaphragms per level. When your structure genuinely is a stack of floors, this is a gift. You get design results organised the way your calculation report already wants them, and the checks that building codes care most about come out without extra work.

Robot starts from a blank three dimensional space. Nodes, bars, panels, solids. There is no assumption that what you are building has floors at all. That costs you a little setup time on a standard tower, because you build the levels yourself rather than having them handed to you. It pays you back the first time a project is not a tower. A water tank, a transmission mast, a stadium roof, a conveyor gantry, a retaining structure: Robot takes all of them without complaint. ETABS can be pushed into some of that work, and engineers do push it, but you are working against the grain.

Here is the practical version. If every job that lands on your desk has floor plates, ETABS is shaped like your work. If one job in four is something else, Robot stops you from owning a second licence for the exception.

Design code coverage

Both cover a lot of ground, in different shapes.

CSI publishes a design-code list for its software, shared across its products, and it is deep where buildings are concerned. Concrete frame design runs from ACI 318-08 through ACI 318-25, with AS 3600, BS 8110, CSA A23.3, Eurocode 2, Hong Kong CoP 2013, IS 456, Italian NTC, Mexican RCDF, NZS 3101, Russian SP 63, Turkish TS 500 and Vietnamese TCVN also present. Steel frame design covers AISC 360 up to the 2022 edition, AS 4100, BS 5950, CSA S16, Eurocode 3 and IS 800. Cold formed work runs on AISI and Eurocode 3 part 1-3. Composite beam design uses Eurocode 4 and the AISC family. That breadth is matched by depth: shear wall design, composite column design and steel joist design are separate modules, not afterthoughts.

Robot takes the other route. It ships country specific section catalogues and code packages that you select in Job Preferences, in imperial or metric, and Autodesk states that it supports a wide range of regional design codes for steel and timber member verification. Steel, timber and concrete member verification are all covered. Timber is the quiet differentiator here, because ETABS does not design timber members at all.

So the honest summary is this. For concrete and steel buildings under a mainstream code, ETABS has more specialised design modules. For a practice that works across several countries, or that touches timber, Robot covers more of the catalogue from one install.

What happens to your Revit model

This is where the two diverge most and where a lot of purchase decisions are actually made.

Robot is an Autodesk product and it reads the Revit analytical model directly. You build the physical model in Revit, refine the analytical representation, send it to Robot, run the analysis, bring results and member sizes back. The link is bidirectional and it is maintained by the same company that maintains both ends. When Revit changes its analytical model, as it did when the analytical elements were separated from the physical ones, Robot follows.

ETABS reaches Revit through CSiXRevit, a plugin published by CSI. It works, it is documented, and plenty of offices run it every week. But it is a connector between two companies’ products, it has to be matched to the Revit year you are running, and Autodesk’s own guidance before exporting is to clean the Revit model down to the elements that actually matter for analysis. That cleanup is not a formality. On a messy architectural model it can take an afternoon.

If your office has standardised on Revit and the round trip matters, Robot removes a moving part. If your Revit use is light and the structural model is built from scratch anyway, this difference is close to irrelevant and you should ignore it.

Hardware and platform

Neither runs on macOS. Both are Windows only, and no amount of wanting it to be otherwise changes that. The gap is in what they ask of the machine.

Autodesk lists 8 GB of RAM as the minimum for Robot Structural Analysis Professional 2027, with 1 GB needed for the install and 5 GB free afterwards, on 64 bit Windows 11 (the 2026 release also listed Windows 10), with an OpenGL 1.4 capable card driving a 1280 by 1024 display.

CSI lists 16 GB as the minimum for ETABS and recommends 64 GB, with 6 GB for the install and a 500 GB or larger PCIe SSD recommended for model files and results. Graphics must support DirectX 11 and 12, with a discrete 4 GB card recommended. The processor guidance points at twelfth generation Intel Core or Zen 3 Ryzen and better.

Read those two lists side by side and ETABS is clearly the more demanding install. That is not a criticism of the software. It reflects how much result data a storey by storey building model generates and how CSI expects you to work with it. But if you are buying the software and the workstation in the same quarter, budget accordingly.

Licensing and how you actually buy it

Two very different stories.

Autodesk states that Robot Structural Analysis is available only in the Architecture, Engineering and Construction Collection, not as a product you add on its own from their store. In practice that means a firm buying direct is buying the whole collection, Revit and Civil 3D and Navisworks and the rest, to get the structural solver. For a large office that is fine, because they wanted most of those anyway. For a three person structural practice it is a lot of software to carry for one tool.

CSI has moved ETABS onto Cloud Sign-in licences and states plainly that standalone and network licences are no longer supported, with existing licences to be converted. If your IT policy keeps design machines off the internet, that is a conversation to have before you commit, not after.

Time before you are productive

We are deliberately not going to put numbers on this, because the honest answer depends entirely on what you already know.

An engineer who has used any CSI product before, SAP2000 most likely, is useful in ETABS almost immediately. The interface logic carries over. An engineer coming from Revit and the Autodesk way of doing things finds Robot familiar in the same way, and finds ETABS slightly alien for the first fortnight.

Coming in cold, ETABS gets you to a correct building result faster, because the program keeps making building shaped decisions for you. Robot asks more of you up front and then stops surprising you. Offices that have lived with Robot for years tend to describe it as a tool they had to learn properly once. That is a fair description, and it is also a warning if you need someone productive next week.

Full comparison table

	Robot Structural Analysis Professional	ETABS
Publisher	Autodesk	Computers and Structures, Inc.
Core idea	General purpose finite element solver	Building specific, story based model
Best fit	Buildings plus towers, tanks, industrial and special structures	Multi storey buildings, concrete and steel
Analysis types	Static, modal, nonlinear, buckling, dynamic, wind load simulation	Static, eigen, Ritz, nonlinear, response spectrum, time history
Solver	Autodesk solver with finite element auto meshing	SAPFire engine, 64 bit solvers, parallelised
Concrete design	Country specific codes selected in Job Preferences	ACI 318-08 to 318-25, Eurocode 2, BS 8110, CSA, AS, IS, NZS and more
Steel design	Country specific codes, including Eurocode families	AISC 360 to 2022, Eurocode 3, BS 5950, CSA S16, AS 4100, IS 800
Timber design	Yes, member verification included	Not covered
Shear wall design	Not listed separately by Autodesk	Dedicated module
Revit link	Direct analytical model exchange, both directions	CSiXRevit plugin from CSI, matched to the Revit year
Automation	Open API for parametric models and custom checks	Published API used widely for scripting
Operating system	Windows 11, 64 bit (2027 release)	Windows 10 or 11, 64 bit
Memory	8 GB minimum	16 GB minimum, 64 GB recommended
Disk	1 GB install, 5 GB free afterwards	6 GB install, large SSD recommended
Licence model	Annual subscription, sold by Autodesk inside the AEC Collection	Cloud Sign-in licence, standalone and network no longer supported

Where the AEC Collection fits

There is a third option that most comparisons skip, and for a lot of readers it is the one that actually applies.

Autodesk does not sell Robot Structural Analysis as a product you pick up on its own from their store. It comes inside the Architecture, Engineering and Construction Collection. If you are buying direct, that is the route, and you end up with Revit, Civil 3D, Navisworks Manage, Advance Steel, InfraWorks, 3ds Max, ReCap Pro and the rest alongside the solver. The structural team gets Robot. The rest of the office gets tools it was probably going to need anyway.

Whether that is good value depends on how many of those apps you would otherwise buy separately. Two or three and the collection usually makes sense. One and it rarely does. We work through that arithmetic in AEC Collection vs buying separately.

	Robot alone	AEC Collection	ETABS
You get	The structural solver	Robot plus Revit, Civil 3D, Navisworks, Advance Steel and more	The building analysis and design package
Suits	A structural specialist	A multi discipline office	A building focused practice
Revit included	No	Yes	No
Detailing included	No	Yes, Advance Steel	No
Non building structures	Yes	Yes	Building focused
Timber members	Yes	Yes	No
Licence term	1 year subscription	1 year subscription	Cloud Sign-in

One thing to be clear about: we sell Autodesk licences, not CSI ones. If ETABS is the right answer for your practice, buy it from CSI or one of their distributors. We would rather tell you that than sell you the wrong solver.

What it costs and how the licence works

We are not going to print Autodesk’s list price here, because it moves by region and by term and a stale number helps nobody. Go to Autodesk for their current figure. What we can describe precisely is what we sell and how it reaches you.

View Robot Structural Analysis View the AEC Collection

Which one should you choose?

Choose ETABS if…

Your workload is buildings and it stays buildings. You are sizing concrete frames, detailing shear walls, checking storey drift against a seismic code, and your reviewer wants output in a format they have read a thousand times. ETABS gives you all of that with the least friction, and its concrete and steel design modules are deeper than Robot’s on exactly that work. For a practice that does nothing but multi storey buildings, this is the better buy, and the Revit connector is a cost you absorb rather than a reason to look elsewhere.

Choose Robot Structural Analysis if…

Your work varies, or your office lives in Revit, or you need several national codes without several licences. Robot handles the tower and then handles the tank. The analytical model travels to and from Revit without a third party plugin in the middle. Timber is in the box. And if your practice sits in a market where the local code is not one of the big four, Robot’s country specific catalogues are often the deciding factor.

Choose the AEC Collection if…

You need Robot and you also need Revit, or Civil 3D, or Advance Steel for detailing. That is the normal situation in any office doing design and documentation under the same roof, and it is the route Autodesk themselves point structural buyers towards.

Choose both if…

You are a larger consultancy with a mixed portfolio. Plenty of firms run ETABS for the building stock and keep Robot for everything that is not a building, plus the Revit round trip. It is not a failure of planning. It is two tools doing two jobs.

Running both on the same project

This happens more than vendors like to admit, and it works if you are disciplined about one thing: decide which model is the source of truth before you start, and write it down.

The common pattern looks like this. The architect’s Revit model arrives. The structural engineer derives the analytical model in Revit, pushes it to Robot for the global analysis, and keeps Robot as the master for geometry and loads. A specialist then rebuilds the lateral system in ETABS to run the storey level seismic checks the local authority wants to see, treating that as a verification model rather than a design model. Results get compared. Where they diverge by more than a few percent, somebody goes looking for the reason, and the reason is almost always a boundary condition or a diaphragm assumption rather than the solver.

What breaks this is letting both models drift. The moment a column moves in one and not the other, every comparison after that is noise.

Moving a model from one to the other

There is no clean direct route between Robot and ETABS. Expect to go through a neutral format or through Revit, and expect to lose things.

Geometry usually survives. Section assignments mostly survive if your section naming is consistent. Load cases, load combinations, releases, offsets and support conditions frequently do not, and meshing never does. On a small frame the rebuild is quicker than the cleanup. On a thirty storey tower it is not, and the time you spend repairing an import is time you could have spent checking the structure.

Treat a transfer as a geometry handover and plan to re-apply loads and combinations by hand. Then verify with a simple case before you trust the second model.

The Autodesk licences we sell

For readers who have decided the Autodesk route is the right one, here is what we stock and what each one is for.

Robot Structural Analysis Professional is the solver this article is about. One year subscription, Windows, one user on up to two devices.

The Architecture, Engineering and Construction Collection bundles Robot together with Revit, Civil 3D, Navisworks Manage, Advance Steel, InfraWorks and more. This is the route Autodesk points structural buyers towards, and usually the better value once you need more than the solver.

Revit on its own, for the practice that models and documents in Revit and sends analysis out to a specialist.

Advance Steel for steel detailing and fabrication drawings downstream of the analysis.

More on how the Autodesk range fits together, including licensing and version questions, is collected in our Autodesk guides hub.

Frequently asked questions

Is ETABS better than Robot Structural Analysis?

Neither is better in general. ETABS is better at ordinary multi storey buildings, because its story based model and its dedicated concrete, shear wall and composite modules are shaped for exactly that work. Robot is better across a wider range of structures and covers more national codes plus timber from a single install. The right question is what your next five projects look like, not which program wins on paper.

Can Robot Structural Analysis replace ETABS for high rise buildings?

Yes, engineers run tall buildings in Robot every day. You will do slightly more setup work to organise the model by level, and some of the storey level reporting that ETABS produces automatically you will assemble yourself. The analysis itself is not the limitation. The workflow convenience is.

Does Robot Structural Analysis work with Revit?

Yes, and this is one of its strongest arguments. Robot exchanges the analytical model, loads and results with Revit in both directions, and both products are maintained by Autodesk, so the link moves with the Revit release cycle rather than lagging behind it.

Can ETABS import a Revit model?

Yes, through CSiXRevit, a plugin published by CSI that has to match the Revit version you are running. Autodesk’s own guidance is to clean the Revit model down to the elements needed for analysis before exporting, which on a detailed architectural model is real work rather than a formality.

Is Robot Structural Analysis available on its own, or only in the AEC Collection?

Autodesk states that it is available only in the Architecture, Engineering and Construction Collection. Resellers including us do offer it as a standalone one year subscription, which is the usual route for a structural specialist who does not need the rest of the collection.

Do Robot Structural Analysis or ETABS run on macOS?

No. Both are Windows only. Autodesk lists 64 bit Windows 11 for Robot 2027, and CSI lists 64 bit Windows 10 or 11 for ETABS. Mac users run either one in a virtual machine or on a separate Windows workstation.

Which one needs a more powerful computer?

ETABS, by a clear margin. CSI lists 16 GB of RAM as the minimum and recommends 64 GB, with 6 GB for the install and a large PCIe SSD recommended for models and results. Autodesk lists 8 GB as the minimum for Robot with 1 GB for the install and 5 GB free afterwards. If you are budgeting for software and hardware together, that difference matters.

Does ETABS design timber members?

No. ETABS covers steel frame, concrete frame, concrete slab, shear wall, composite beam, composite column, steel joist, cold formed steel and aluminum frame design. Timber is not part of it. Robot does include timber member verification, which for practices working in mass timber is often the deciding point.

Which design codes does ETABS support?

A wide set, published by CSI. Concrete frame design runs from ACI 318-08 through ACI 318-25 and includes Eurocode 2, BS 8110, CSA A23.3, AS 3600, IS 456, NZS 3101, Hong Kong CoP 2013, Mexican RCDF, Russian SP 63, Turkish TS 500 and Vietnamese TCVN. Steel frame design covers AISC 360 through the 2022 edition, Eurocode 3, BS 5950, CSA S16, AS 4100 and IS 800. Cold formed design uses AISI and Eurocode 3 part 1-3.

Can I transfer a model between Robot and ETABS?

Not cleanly. There is no direct bridge, so you go through a neutral format or through Revit, and you should expect geometry to survive while load cases, combinations, releases and support conditions often do not. Treat any transfer as a geometry handover, re-apply loading by hand, and verify with a simple test case before trusting the results.

Related reading

• Revit vs AutoCAD: which one should you use
• Revit vs Archicad compared
• AEC Collection vs buying separately: which wins
• All Autodesk guides