> For the complete documentation index, see [llms.txt](https://dronesim.gitbook.io/dronesim-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dronesim.gitbook.io/dronesim-docs/dronesim.md).
# DRONESIM
Simulation is a quick, easy, and, most importantly, safe way to test changes to flight code before attempting to fly in the real world. It is also an excellent way to start flying with the PX4 and ArduPilot flight stack when you still need a vehicle to experiment with.
DRONESIM cloud simulator spins up a PX4 or Ardupilot software in the loop simulation to control a computer-modeled vehicle in a simulated "world." You can interact with this vehicle just as you might with an actual vehicle, using QGroundControl, MissionPlanner, an offboard API, or a radio controller/gamepad.
Start a simulation in just a few clicks!
With DRONESIM, you can easily create new applications by connecting to your simulated vehicles. Develop locally and connect to your simulation using the client, empowering you to innovate and experiment.
1. Get experience operating UAS with actual ground station software for flight planning and geofencing.
2. Quickly test the latest features in ardupilot releases by running simulations of the latest releases.
3. Offload simulation compute to the cloud to simplify your vehicle design, control system, or robotic application development process.
4. Run multiple simulations with different robotic platforms.
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