PLC Simulator
RoboDK alternative · Learn first, free

A free, browser-based RoboDK alternative for learning robot programming

RoboDK is a powerful paid desktop tool for offline programming and simulation across many robot brands — built to generate real production programs. If what you actually need first is to learn robot programming, this is a free, zero-install browser simulator that teaches the fundamentals hands-on with real URScript, auto-graded lessons, and a certificate. Here is an honest look at which one fits you.

Try it now — no accountGo Pro — full course + certificate

Honest note: this is not a replacement for RoboDK’s production offline programming. It does not do multi-brand OLP or generate real robot programs via post-processors. It is the free place to learn the fundamentals first.

A UR-style six-axis robot arm standing in a 3D factory cell in the browser-based robot simulator, with a parts table, safety railing and pallet — a free, no-install way to learn robot programming as an alternative to desktop offline-programming software.

Opening honesty

We make one of the tools being compared.

We have tried to be fair to RoboDK — read the RoboDK side below before you form an opinion. In one sentence: RoboDK is the better tool if you need professional, multi-brand offline programming and real production code generation. Ours is the better tool if you want to learn the fundamentals of robot programming right now, on any device, for free, before you spend money on a production suite. They are complementary, not interchangeable.

Background

What RoboDK actually is

RoboDK is a commercial desktop application for offline programming (OLP) and simulation of industrial robots. You build a 3D model of your robot and work cell, plan motions and targets, simulate the program, and then generate the actual robot program that runs on real hardware. It supports a large library of robot brands and uses post-processors to translate a simulated program into each brand’s native code.

It is a professional production tool: integrators and manufacturers use it to design cells, validate reach and reachability, optimise paths, and program tasks like machining, welding, palletising, and pick-and-place without tying up the real robot. It runs on Windows, macOS, and Linux, and it is licensed software with a trial available. For current pricing and trial terms, check RoboDK’s own website — we do not quote competitor pricing here because it changes.

In short: RoboDK is excellent at what it is built for — multi-brand offline programming and generating real, deployable robot programs. That is exactly the part our simulator does not try to do.

The offline programming workflow RoboDK is built for: model the robot and work cell in 3D, plan paths, simulate, then post-process to generate real robot code for the controllerOffline-programming flow: write and simulate the robot program on a laptop, deploy it, then run it on the real robot.write & simulate(offline)deploytransferreal robot
RoboDK’s job: model the cell, plan paths, simulate, then post-process to deployable robot code — the production OLP workflow our learning simulator deliberately does not attempt.
Multi-brand robot languages RoboDK targets via post-processors: FANUC TP, ABB RAPID, KUKA KRL, Yaskawa, and Universal Robots URScript all generated from one programFour robot programming languages — URScript, ABB RAPID, KUKA KRL and FANUC TP — each expressing the same joint move, showing the concepts transfer across vendors.same move — four dialectsURScriptUniversal Robotsmovej(p1)RAPIDABBMoveJ p1KRLKUKAPTP P1TPFANUCJ P[1]
RoboDK’s post-processors target dozens of brands and languages — FANUC TP, ABB RAPID, KUKA KRL, URScript. Our simulator teaches one real language (URScript) whose concepts transfer to them all.

Who each is for

Two different jobs

The honest way to choose between these tools is to be clear about what you are trying to do. RoboDK is built to produce programs that run on real robots. We are built to teach you the thinking those programs rely on — before you ever touch a production tool or real hardware.

RoboDK is for you if…

  • You need to generate real programs for real robots.
  • You work across multiple robot brands and need post-processors.
  • You are designing or validating an actual work cell.
  • You are doing production tasks: machining, welding, palletising, deburring.
  • You already understand robot-programming fundamentals.
  • You are an integrator or manufacturer shipping to hardware.

Our simulator is for you if…

  • You are learning robot programming from the ground up.
  • You want to start for free, today, with no install.
  • You are on a Mac, Linux machine, Chromebook, or locked-down laptop.
  • You want guided, auto-graded lessons rather than a blank canvas.
  • You want to write real URScript and see it run under physics.
  • You want a certificate to show you have learned the fundamentals.

Fair comparison

RoboDK vs this browser simulator

This table compares the two on the dimensions that matter when you are choosing where to start. Note the focus difference: RoboDK is a production offline-programming suite; we are a learning environment. The right answer depends entirely on which job you are doing.

DimensionRoboDKThis simulator
Primary focusProduction offline programming & simulationLearning robot-programming fundamentals
InstallDesktop app (Windows, macOS, Linux)Runs in any modern browser — nothing to install
Price to startPaid license (trial available)Free to start; Pro subscription for the full course
Robot brandsLarge multi-brand libraryUR-style six-axis arm with real URScript
Generates real robot programsYes — via post-processorsNo — it is for learning, not production code
Guided curriculumProfessional tool, not a courseGuided, auto-graded lessons
Auto-graded feedbackYou validate in simulation yourselfYes — tasks are scored against a goal
CertificateNoYes (Pro)
Best forIntegrators shipping to hardwareBeginners and learners building the basics

To be clear: we do not claim feature parity with RoboDK’s production capabilities. RoboDK does multi-brand offline programming and real code generation that this simulator deliberately does not attempt.

In the simulator

The fundamentals you build here — for free

These are the concepts every robot programmer relies on, whatever tool or brand they end up using. You do not just read about them — you write real URScript, run it on a simulated six-axis arm under physics, and get graded against a goal.

The six-axis arm you program in the free RoboDK alternative simulator, with joints J1 to J6, a gripper, and the tool center pointA six-axis articulated robot arm with a base and a two-finger gripper, its six rotary joints labelled J1 through J6.J1J2J3J4J5J6TCP
A six-axis arm with a TCP.
World, base, and tool coordinate frames in the robot simulator — the foundation every offline-programming tool, RoboDK included, builds onTwo coordinate frames — a fixed base frame and a tool centre point (TCP) frame — each drawn with red X, green Y, and blue Z axis arrows.ZXYBASEZXYTCP
World, base & tool frames.
Joint versus linear motion taught in the simulator — a fast curved joint move compared with a straight Cartesian line, a decision identical in RoboDKTwo tool paths between the same two points: a curved joint move (movej) in cyan and a straight linear move (movel) in amber.ABmovej — joint arcmovel — straight line
Joint vs linear motion.

Frames & coordinate systems

World, base, and tool frames decide where the robot thinks it is — the foundation every OLP tool, RoboDK included, builds on.

Tool Center Point (TCP)

Define the working point of your gripper or tool so the robot moves the right spot to the right place.

Joint vs linear motion

movej moves fast through joint space; movel keeps the tool on a straight Cartesian line. Knowing when to use each is core everywhere.

Waypoints & sequencing

Approach, act, retract — chaining points into a smooth, safe path is the same skill on any controller.

Digital I/O & grippers

Read inputs and set outputs to drive a gripper or signal a PLC — universal, only the instruction names change.

Payload, reach & safety

Configure payload, respect reach limits, and avoid collisions and over-force contact — the discipline production tools assume you have.

Try it now — no accountGo Pro — full course + certificate

Honest recommendation

Use RoboDK for production. Use us to learn first.

If you need to generate real programs for real robots across multiple brands, you want a production offline-programming tool — RoboDK is a strong, professional choice and we are not pretending to replace it. But if you are still learning, paying for and wrestling with a production suite before you understand frames, TCP, motion types, and safety is the slow way round.

The faster path is to build the fundamentals where they are free and frictionless — in the browser, with guided, auto-graded lessons — and then move to a tool like RoboDK once those basics are second nature. When you do, you will be learning RoboDK’s interface, not learning to think like a robot programmer from scratch.

Need production OLP today?

If you are an integrator shipping to real, multi-brand hardware, a production tool like RoboDK is the right home for that work. Learn the fundamentals here first and it will go much faster.

Learning the basics?

Open a tab, write real URScript on a UR-style arm, and practise the exact concepts every OLP tool relies on — for free, with graded tasks, and a certificate when you finish.

The learning path before RoboDK: free fundamentals lessons, then the full Pro course, then a verifiable robot programming certificate to take into production OLP workA progression from lessons, through three completed checkmarks, to a certificate seal — learn then certify.lessonspass graded taskscertificate
Free fundamentals → full Pro course → a verifiable certificate — then graduate to a production tool like RoboDK with the basics already second nature.

Keep exploring

More robot programming resources

Questions

RoboDK alternative FAQ

If your goal is to learn robot programming, yes — this simulator is a free, browser-based alternative for the learning part. You write real URScript on a simulated six-axis arm, run guided auto-graded lessons, and practice the fundamentals (frames, the tool center point, joint vs linear motion, waypoints, I/O, pick-and-place, payload, and safety) without installing anything or paying to start. To be straight with you, it is not a free clone of RoboDK’s production capabilities: it does not do multi-brand offline programming or generate real robot programs via post-processors. It is the place to build the skills first.

Learn the fundamentals first — free, in your browser.

Write real robot code in a tab — frames, TCP, motion, I/O, pick-and-place, and safety. No install, no robot, free to start. Then take those skills to a production tool like RoboDK.

Try it now — no accountGo Pro — full course + certificate

Software evaluation field guide

RoboDK alternative: evaluation checklist

Direct answer

The evaluator can identify whether the job is learning, reach checking, path planning, post-processing, cell integration or controller validation and choose accordingly.

Written for robot learners, integrators and instructors comparing browser practice, offline programming, brand tools and multi-vendor simulation workflows.

System map / 02

NODE 01observable

Requirement

The robot brand, controller, task, CAD, tooling, frames, collision need, post-processing need, budget and deployment outcome.

NODE 02observable

Test job

Learning and offline-programming features through paths, frames, I/O, code generation and target-controller verification.

NODE 03observable

Baseline result

The same approach, process and depart path evaluated with recorded frame and payload assumptions.

NODE 04observable

Stress case

Unsupported robot, post-processor, calibration, singularity, collision, license and target-version limits.

NODE 05observable

Failure handling

A geometry, frame, reach, path, code, connection or workflow mismatch.

NODE 06observable

Decision record

The selected program verified in the official target tools and safeguarded cell.