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Cookie Policy
Effective date: July 16, 2026
This Cookie Policy explains how Tandem App, Inc. (“Tandem”, “we”, “us”, or “our”) uses cookies and similar technologies on the Tandem website and platform, including usetandem.ai and Tandem services hosted on that domain.
For information about our processing of Personal Data, see our Privacy Policy.
1. What are cookies?
Cookies are small text files stored on a browser or device when a person visits a website or uses an online service. We also use similar technologies, such as browser local storage, to remember preferences and support the operation of our Services.
2. Cookies and similar technologies we use
Type
Type
Purpose
Purpose
Provider
Provider
Typical retention
Typical retention
Strictly necessary
Strictly necessary
Keeps an authenticated user signed in and protects access to the platform.
Keeps an authenticated user signed in and protects access to the platform.
Tandem
Tandem
Up to 14 days
Up to 14 days
Strictly necessary
Strictly necessary
Stores short-lived session information to support secure and efficient use of the platform.
Stores short-lived session information to support secure and efficient use of the platform.
Tandem
Tandem
Up to 5 minutes
Up to 5 minutes
Strictly necessary
Strictly necessary
Remembers whether the in-app navigation sidebar is expanded or collapsed.
Remembers whether the in-app navigation sidebar is expanded or collapsed.
Tandem
Tandem
Up to 7 days
Up to 7 days
Strictly necessary
Strictly necessary
Supports a one-time secure sign-in handoff between Tandem and a customer site or widget, where that feature is used.
Supports a one-time secure sign-in handoff between Tandem and a customer site or widget, where that feature is used.
Tandem
Tandem
Up to 1 minute
Up to 1 minute
Analytics and performance
Analytics and performance
Helps us understand product usage, feature adoption, and platform performance.
Helps us understand product usage, feature adoption, and platform performance.
PostHog
PostHog
Up to 365 days
Up to 365 days
Local storage
Local storage
Remembers cookie choices and interface preferences, such as theme and onboarding preferences.
Remembers cookie choices and interface preferences, such as theme and onboarding preferences.
Tandem
Tandem
Until cleared by the user or browser
Until cleared by the user or browser
The main Tandem cookies currently include:
- __Secure-better-auth.session_token — authenticated session; up to 14 days.
- __Secure-better-auth.session_data — short-lived session cache; up to 5 minutes.
- sidebar:state — sidebar preference; up to 7 days.
- tandem_handoff_intent — one-time handoff flow only; up to 1 minute.
- ph_<project-key>_posthog — PostHog analytics identifier; up to 365 days.
In non-production or non-HTTPS environments, the Better Auth cookies may appear without the __Secure- prefix.
3. Analytics
Tandem uses PostHog for product analytics and usage telemetry. PostHog helps us understand how users interact with the platform, identify performance issues, and improve features.
PostHog analytics cookies are first-party cookies set on Tandem domains. We do not use advertising-network or social-media tracking cookies.
4. Managing preferences
You can control cookies through your browser settings, including by deleting existing cookies or blocking future cookies. Blocking strictly necessary cookies may prevent parts of the Tandem platform from working correctly.
Where available, you can manage analytics-cookie preferences through Tandem’s cookie banner. You may also clear browser local storage through your browser settings.
5. Changes to this Cookie Policy
We may update this Cookie Policy from time to time. We will post the updated version on this page and update the effective date above.
6. Contact
For questions about this Cookie Policy or our privacy practices, contact us at privacy@usetandem.ai.