Cookie policy
Last updated: 3 November 2026 · E-Smart Solutions Limited
1. What this policy covers
This policy explains the cookies and similar technologies used by the 4-Sight website (4-sight.com) and the 4-Sight application (app.4-sight.com), both operated by E-Smart Solutions Limited. Our privacy policy explains how we handle personal information.
2. In short
We use only cookies that are strictly necessary for signing in, keeping your session secure and crediting the accountant who referred you. We do not use analytics, advertising, social-media or tracking cookies, and we do not use cookies to profile you. Under UK law (the Privacy and Electronic Communications Regulations), strictly necessary cookies do not need consent, so we do not show a cookie banner.
3. Cookies we set
- FOUR_SIGHT_SESSION (website). Purpose: keeps you signed in to the partner or admin area and protects forms from forgery. Contains a random session identifier only. Lasts until you close your browser; the server ends the session after 30 minutes of inactivity or 12 hours overall. Strictly necessary.
- __4sight (application). Purpose: keeps you signed in, protects the connection to your accounting software while you sign in, and remembers a firm’s referral code so the firm can be credited when you connect for the first time. Its contents are signed so they cannot be altered. Lasts up to 30 days; signing out removes it. Strictly necessary.
Both cookies are restricted to our own sites, sent only over HTTPS and cannot be read by page scripts. Neither site uses localStorage or sessionStorage to track you.
4. Referral links
A firm’s referral code travels in the page address (for example ?ref=…). The website does not store it. The application keeps it in the __4sight cookie described above, for up to 30 days. A referral never gives the firm access to your accounting records or results.
5. Fonts, scripts and media
Our fonts (DM Sans and Manrope) and scripts are served from our own hosting, so your browser does not contact Google or other font or script services when you use our sites. There are no embedded videos, analytics tags, advertising pixels or chat widgets.
6. Other companies’ pages
When you sign in to Xero (or another accounting provider), pay through Stripe or manage your subscription in Stripe’s billing portal, you are on that company’s own website. Its cookies are governed by its own cookie and privacy policies, not this one.
7. Your choices
You can view, block or delete cookies in your browser settings. If you block our cookies, you will not be able to sign in to the partner area or the application.
8. Changes
If we ever introduce optional cookies, such as analytics, we will update this policy first and ask for your consent before setting them, with an equally clear option to refuse. Contact details are in our privacy policy.