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OpenALPR logo.png
Original author(s)Matthew Hill[1]
Developer(s)OpenALPR Technology, Inc.[2]
Initial release2 May 2014; 6 years ago (2014-05-02)[2]
Stable release
2.5.103 / March 5, 2018; 3 years ago (2018-03-05)
Written inC, C++, Python, Java, and C#
Operating systemLinux, Windows[3]
PlatformIA-32 (i386), x86-64 or ARM
Size276 MB
Available in1 languages
List of languages
TypeAutomatic number-plate recognition
LicenseProprietary and AGPL

OpenALPR is an automatic number-plate recognition library written in C++. The software is distributed in both a commercial and open source version.


OpenALPR was originally developed by a two-man team led by Matt Hill.[1] The open source software became available as a free download at the end of 2015.[4] In March 2016, OpenALPR launched paid Cloud API service[5] and in February 2017 introduced the OpenALPR agent for Axis Communications cameras.[6]

In August 2017 an Australian web developer Tait Brown became known by creating an alternative to an 86 million AUD project of Victoria Police by using OpenALPR.[7] In March 2018 ProgrammableWeb added OpenALPR to its list of Recognition APIs.[8]


OpenALPR is an automatic number-plate recognition library written in C++.[9] The software is distributed in both a commercial cloud based version[1] and open source version.[3][10] OpenALPR makes use of OpenCV and Tesseract OCR libraries. It could be run as a command-line utility, standalone library, or background process. The software also integrates with video management systems (VMS) such as Milestone XProtect.[11]


  1. ^ a b c Farivar, Cyrus (December 5, 2015). "New software watches for license plates, turning you into Little Brother". Ars Technica. Retrieved June 11, 2018.
  2. ^ a b Hill, Matthew. "state_detector.cpp". GitHub. Retrieved June 21, 2018.
  3. ^ a b Cardinal, David (August 4, 2016). "How to get started with DIY home surveillance systems". ExtremeTech. Retrieved June 11, 2018.
  4. ^ "New Software Allows You to Scan License Plates Just like a Cop". December 9, 2015. Retrieved June 11, 2018.
  5. ^ "OpenALPR Technology Releases Cloud Service for Automatic License Plate Recognition and Vehicle Classification". March 7, 2016. Retrieved June 23, 2018.
  6. ^ Waitt, Tammy (February 13, 2017). "OpenALPR & Axis Offer Affordable ALPR Service Plans (See Video)". Retrieved June 23, 2018.
  7. ^ Brown, Tait (August 28, 2017). "How I replicated an $86 million project in 57 lines of code". freeCodeCamp. Retrieved June 11, 2018.
  8. ^ Culbertson, Joy (March 31, 2018). "Daily API RoundUp: FlexAwards, Amazon GameOn, Blockbridge". ProgrammableWeb. Retrieved June 23, 2018.
  9. ^ Bhadoria, Shantanu; Oliva Ramos, Ruben (2017). "Erase Parking Headaches with OpenCV and Raspberry Pi". Raspberry Pi 3 Home Automation Projects: Bringing your home to life using Raspberry Pi 3, Arduino, and ESP8266. Packt Publishing Ltd. p. 82. ISBN 978-1-78328-387-3 – via Google Books.
  10. ^ James, Mike (December 18, 2015). "Openalpr - An Open Source Licence Plate Reader". Retrieved June 23, 2018.
  11. ^ Karas, Brian (March 22, 2016). "SaaS LPR Startup OpenALPR Examined". Retrieved June 21, 2018.(subscription required)

External links[edit]