Aims and Origin

We aim to make bone marrow aspirate diagnosis faster, more accurate, and educational.

CellCountr was originally developed at the second and third NHS Hack Day in Liverpool 2012 and Oxford 2013, by a team of haematologists, junior doctors, medical students, clinical scientists and professional developers.

Code, licence

The source code can currently be found here: The code is free to download and is released under the MIT License. Further details can be found on the GitHub repository.

Get involved, receive updates

This site provides v1.0, a basic counting tool. CellCountr v2.0 is under development and will provide entirely new functionality to the project.

We'd love you to get involved.

Google group
Join Cellcounter
Follow us
Email us

Using this site

At present this site is optimised for Chromium-based browsers or Firefox and displays of 1024x768 and over. We plan to broaden compatibility with other browsers in the near future. In the meantime you may be able to install Google Chrome or a related standalone browser such as SRWare Iron portable without administrative rights if your local IT policy permits this.

Previous offline version

A standalone basic speadsheet version of the diff counter is also available to download: Diff Calculator_Public.xls


The hosting for is provided by the amazing people at BigV — check them out.

CellCountr CIC is a community interest company (registered company no. 08582198). This guarantees that the company cannot be wound up and used to generate a profit for the directors, so the community will always benefit from any contributions made to CellCountr.