We use cookies on our website to personalise your experience and serve you relevant content.
A cookie is a small file containing a string of characters that is sent to your computer when you visit a website. When you visit the site again, the cookie allows that site to recognise your browser. Cookies may store user preferences and other information.

How can I control cookies?

  • You have the right to decide whether to accept or reject all cookies that are not necessary for the operation of our website.
  • When you first visit our website, a cookie banner will appear asking you for permission to place a cookie on your browser. You can choose to accept or decline.
  • If you decline you can still use our website but your access to some functionality and areas of the site might be restricted.
  • If you accept cookies but change your mind later,  you can adjust your web browser controls to delete or refuse cookies.

These cookies fall into two general categories

  • Essential/necessary cookies - these cookies are needed to provide you with services available through our website and subscription service.
  • Non-essential cookies – these include cookies set by Google Analytics, Hotjar, and ones that we set ourselves listed in the second part of the table below. We will not set any of these cookies if you select decline in the consent banner under the General Data Protection Regulation (GDPR).

Essential / Necessary Cookies

Cookie type Purpose  
This cookie is used to remember not to ask visitors to accept cookies again. This cookie is set when the ‘opt out’ or ‘decline’ option is selected.
Expires: 2 years
This cookie can be set to prevent the tracking code from sending any information to HubSpot. Setting this cookie is different from opting out of cookies, which still allows anonymised information to be sent to HubSpot.
Expires: 2 years
This cookie is used to test whether a visitor has support for cookies enabled.
Expires: Session cookie
This cookie is used to consistently serve visitors the same version of an A/B test page that they’ve seen before.
Expires: Session cookie
This cookie is used to consistently redirect visitors to the language version of a page in the language they’ve selected on this top-level private domain in the past (if such a language version exists).
When visiting a password-protected page, this cookie is set so future visits to the page from the same browser do not require login. The cookie name is unique for each password-protected page.
hs-messages-is-open (TTL 30 minutes)
This cookie is used on the visitor UI side so HubSpot can determine/save whether the chat widget is open for future visits. It resets after 30 minutes to re-close the widget after 30 minutes of inactivity.
hs-messages-hide-welcome-message (TTL 1 day)
When you dismiss the welcome message in your messages tool, a cookie is set to prevent it from appearing again for one day.


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Non-Essential Cookies

Cookie type
The main cookie for tracking visitors. It contains the domain, utk (see below), initial timestamp (first visit), last timestamp (last visit), current timestamp (this visit), and session number (increments for each subsequent session).
Expires: 2 years
This cookie is used for to keep track of a visitor's identity. This cookie is passed to HubSpot on form submission and used when de-duplicating contacts.
Expires: 10 years
This cookie keeps track of sessions. This is used to determine if we should increment the session number and timestamps in the __hstc cookie. It contains the domain, viewCount (increments each pageView in a session), and session start timestamp.
Expires: 30 min
Whenever a session cookie changes, this cookie is also set. We set it to 1 and use it to determine if the visitor has restarted their browser. If this cookie does not exist when we manage cookies, we assume it is a new session.
Expires: None. Session cookie
This cookie is used to recognise visitors who chat with us via the messages tool. If a visitor leaves the site before they're added as a contact, they will have this cookie associated with their browser. If we have a history of chatting with you and you return to the site later in the same cookied browser, the messages tool will load your conversation history.


Google Analytics

We use Google Analytics to analyse how visitors use our website including:
  • Type of content you engage with
  • Referring website addresses
  • IP address
  • Internet service provider
  • Browser type
  • Mobile device type
  • Page visit and views
Any other data points that help us understand how we can personalise your experience.
The data provides a general overview to help us improve your web experience.
For more information on the types of cookies used by Google, visit their cookie policy:


We use Hotjar analytics to improve usability of our website and understand how you interact with various components of our site, such as visitor polls.
For more information on the types of cookies used by Hotjar, visit 

How to contact us

If you have any questions about this cookie policy, please email us at support@opensensors.com or call +44 (0)20 3868 4376.

Changes to this Cookie policy

  • This cookie notice was updated on 27 July 2018.
  • If we make any changes to our cookie policy we’ll update it on this page.
  • If the changes are significant we’ll let you know by email.