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UI Automation Activities
Last updated Apr 26, 2024

About the Computer Vision Local Server package

The UiPath.ComputerVision.LocalServer package contains no activities, but once installed in a project, enables you to use a local Computer Vision server. It can be installed via the Package Manager in Studio.

The local Computer Vision model is on par feature wise with the current server model. There are small differences between these versions of the model, such as:

  • Computer Vision Local Server enables you to use Computer Vision directly on the machine it is installed on, without requiring other external resources, such as a separate Server Machine or a powerful GPU, etc.
  • The Local Server is slower than the other available types of servers.
  • All data used by this version of the model is processed locally, on the machine you have it installed on. No data is sent outside of your machine to be processed.
  • Costs associated with this version of the model are considerably lower, as the hardware and maintenance requirements are null compared to the on-premises server version.
  • The model can process up to 2000 words per request. If a request exceeds this limit, the model still returns 2000 words, but with no guaranteed order.
  • Up until v21.6, the Computer Vision Local Server does not support OCR.
  • Up until v22.7, the Computer Vision Local Server does not support Table Extraction.

Recommended hardware specifications

You need a machine with the following hardware specifications:

  • a CPU with minimum 4 cores; the performance scales with multiple CPUs, so 8 cores would be even better, however, please note that scaling above 16 cores would have diminishing returns with little to no speedup
  • AVX2 support; CPUs without AVX2 instructions are not supported and an error is thrown if they are used
  • minimum 8 GB of RAM

When should this server version be used?

  • When you cannot use the Computer Vision Cloud server or the Computer Vision On-premises server.
  • When, due to security concerns, you do not want any data leaving the machine you are running the automation process on.
  • When you cannot install additional software on the machine you want to use, as this version does not require additional installation on the machine, it can simply be installed from Studio, via the Package Manager.

How do you use this server?

Install the UiPath.ComputerVision.LocalServer package in your Studio Project by using the Package Manager.

Once this package is installed, the CV Screen Scope activity can be configured via the UseLocalServer property to use this local server.


To run correctly, UiPath.ComputerVision.LocalServer needs the Visual C++ Redistributables for 2015-2019 for both x64 and x86 systems installed on the operating system where you want to use it. You can find the latest versions here.

If you're using the UiPath.ComputerVision.LocalServer package and you're encountering a Response from server is not valid error, the most probable explanation is that the local server executable is being blocked by an antivirus software. Please check that
UiPath.CVLocalServer.Host.exe from CurrentUser\.nuget\packages\uipath.computervision.localserver\20.10.0\lib\net461 (for version 20.10) or CurrentUser\.nuget\packages\uipath.computervision.localserver\USED_VERSION\build (for version 21.2 and up) is trusted by the antivirus software you are using.
  • Troubleshooting

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