The NHS COVID-19 app is part of the NHS Test and Trace service in England and NHS Wales Test, Trace, Protect. It is an important tool to help break the chains of transmission of coronavirus (COVID-19). Read more about the app.
From February 2021, the Department for Health and Social Care publishes weekly statistics on the NHS COVID-19 app on this page. This information is also available in Welsh (Mae’r wybodaeth hon hefyd ar gael yn Gymraeg).
Notes on the published data
The Department of Health and Social Care collects this data and publishes these statistics about the NHS COVID-19 app. Due to the design of the app, all data collected is anonymous and reporting is aggregated. Read more about how the app protects the privacy of app users.
The NHS COVID-19 app covers England and Wales only. Similar contact tracing apps are in place in Scotland and Northern Ireland.
Data about app downloads, NHS QR code posters, and venue alerts are available at country level, i.e. England and Wales combined.
Data about venue check-ins, contact tracing alerts, symptoms reported and tests booked through the app, are available at Lower Tier Local Authority (LTLA) level as well as country level.
App users on versions of the app earlier than 3.12 (released on 30 November 2020) were asked to enter their postcode district on setup. A single postcode district may cover multiple LTLAs. For data purposes, if we only have the user’s postcode district, this is mapped to the LTLA with the highest weighted population, based on estimates provided by the Office of National Statistics. All data recorded for postcode districts on the Isles of Scilly was merged with Cornwall.
To improve local advice for app users, a change was made to version 3.12 of the app to ask users for their LTLA if their postcode district covers more than one. The published data reflects this from 25 January 2021. As user-entered local authority is more accurate than the mapping that was undertaken previously, week on week data values in some areas may increase or decrease between the reporting weeks ending 21 January, 28 January and 4 February.
The NHS COVID-19 app launched an ‘early adopters’ trial from 13 August 2020. Data on the number of app downloads, and the number of NHS QR code posters created, starts from this date.
The app launched nationally in England and Wales on 24 September 2020. Most of the published data starts from this date.
Data on the number of venue alerts sent starts from 10 December 2020. This is when an improved process was introduced that let us better identify clusters linked to venues, and streamline the sending of venue alerts.
From 18 February 2021, this data will be updated on a weekly basis.
All data values are subject to small number suppression in order to maintain confidentiality. This means that is any value falls between 1 and 5, the data will always display a value of 5.
Because of small number suppression, it may not be possible to sum values across all Lower Tier Local Authorities to obtain the same values provided in the country level data.
Most data is received within 24 to 48 hours of an event occurring. However, in some circumstances (for example, when a device does not have an internet connection or has been turned off), data will arrive later. Because of this, data continues to increase for earlier dates. All graphs and underlying data sets are fully refreshed each week.