Cookie Policy
Bart - Your AI-powered tax assistant
Effective Date: 1 April 2026 | Last Updated: 14 February 2026
1. Introduction
This Cookie Policy explains how HELLO BART LTD ("we", "us", or "our") uses cookies and similar technologies when you visit our website at hellobart.com or use our web application.
This policy is provided in accordance with the Privacy and Electronic Communications Regulations (PECR) 2003 and the UK General Data Protection Regulation (UK GDPR). It should be read alongside our Privacy Policy, which explains how we handle your personal data.
2. What Are Cookies?
Cookies are small text files stored on your device (computer, tablet, or mobile) when you visit a website. They help the website remember your preferences and understand how you use the site.
Similar technologies include:
- Local storage - data stored in your browser
- Session storage - temporary data cleared when you close your browser
- Device identifiers - used in mobile apps for similar purposes
3. Cookies We Use
3.1 Essential Cookies
These cookies are necessary for the website and application to function. They cannot be disabled.
| Cookie | Purpose | Duration |
|---|---|---|
| sb-access-token | Supabase authentication | Session |
| sb-refresh-token | Supabase session refresh | 7 days |
| csrf_token | Security - prevents cross-site request forgery | Session |
Legal basis: Legitimate interests (essential for service operation)
3.2 Functional Cookies
These cookies remember your preferences and settings. They are not strictly necessary but improve your experience. They are only set with your consent.
| Cookie | Purpose | Duration |
|---|---|---|
| theme | Remembers light/dark mode preference | 1 year |
| locale | Remembers language preference | 1 year |
Legal basis: Consent (you can opt out via the cookie banner)
If you do not consent to functional cookies, you can still use the Service — preferences will reset each session.
3.3 Analytics Cookies
These cookies help us understand how visitors use our website. Analytics data is pseudonymised — a randomly generated identifier is assigned to your session, but it is not linked to your account or personal details.
| Cookie | Purpose | Duration |
|---|---|---|
| _analytics_id | Pseudonymised usage tracking | 1 year |
Legal basis: Consent (you can opt out via the cookie banner)
We do not use Google Analytics or other third-party analytics platforms that track you across websites.
4. Third-Party Cookies
Some third-party services may set cookies when you use our Service:
| Provider | Purpose | Duration | More Information |
|---|---|---|---|
| Supabase | Authentication | Per Supabase policy | Supabase Privacy Policy |
| RevenueCat | Subscription management (checkout only) | Per RevenueCat policy | RevenueCat Privacy Policy |
| If you sign in with Google | Per Google policy | Google Privacy Policy | |
| Apple | If you sign in with Apple | Per Apple policy | Apple Privacy Policy |
| Featurebase | Customer support widget, live chat | Per Featurebase policy | Featurebase Privacy Policy |
Third-party cookie durations are governed by each provider's own cookie and privacy policies, linked above.
We do not allow advertising cookies or sell data to third parties.
5. Mobile Application
Our mobile apps (iOS and Android) do not use cookies. However, they may use similar technologies:
- Secure storage - for authentication tokens
- Local preferences - for app settings
- Device identifiers - for push notifications only
These are essential for app functionality and cannot be disabled while using the app.
6. Your Cookie Choices
6.1 Cookie Consent Banner
When you first visit our website, you will see a cookie consent banner. You can:
- Accept all cookies — enables functional and analytics cookies
- Essential only — only strictly necessary cookies are used
- Manage preferences — choose which categories to enable (functional, analytics)
6.2 Changing Your Preferences
You can change your cookie preferences at any time by:
- Clicking Cookie Settings in the website footer
- Contacting us at support@hellobart.com
6.3 Browser Settings
Most browsers allow you to:
- View what cookies are stored
- Delete cookies individually or all at once
- Block cookies from specific or all websites
- Block third-party cookies
How to manage cookies in common browsers:
6.4 Impact of Disabling Cookies
If you disable essential cookies, you will not be able to:
- Sign in to your account
- Use the Bart application
If you disable analytics cookies, your experience will not be affected.
7. Do Not Track
We do not track users across third-party websites. Some browsers offer a "Do Not Track" (DNT) signal — while there is no industry standard for DNT compliance, our practices already align with its intent as we do not engage in cross-site tracking.
8. Updates to This Policy
We may update this Cookie Policy to reflect changes in our practices or for legal reasons. Material changes will be notified via our website. The "Last Updated" date indicates the most recent revision.
9. Contact Us
If you have questions about our use of cookies:
HELLO BART LTD
- Email: support@hellobart.com
- Address: 64a Cathnor Road, London, W12 9JA
- Company Number: 16844864
For general data protection enquiries, see our Privacy Policy.
Document Version: 1.1
Review Date: 1 April 2027