Cookie Policy
Last updated: August 2026
1. What are cookies?
Cookies are small text files placed on your device when you visit a website. They help the site remember your preferences, understand how you use it, and deliver relevant content. Some cookies are essential for the site to work; others are optional and require your consent.
2. Cookies we use
Essential Cookies
Always active. Required for CalcStack to function.
| Cookie | Purpose | Duration |
|---|---|---|
| calcstack_consent | Stores your cookie consent preferences | 365 days |
| cs_access | Stores your verified email for premium access | 30 days |
Analytics Cookies
Optional. Help us understand how visitors use CalcStack. Google Analytics is only loaded after you accept analytics cookies — nothing is sent to Google before you choose.
| Cookie | Purpose | Duration |
|---|---|---|
| _ga | Google Analytics — distinguishes users | 2 years |
| _ga_* | Google Analytics — maintains session state | 2 years |
Advertising Cookies
None. CalcStack does not display adverts and sets no advertising or ad-targeting cookies. We are funded by CalcStack Pro subscriptions and one-off tool purchases.
Third-party Cookies
Set by payment and service providers.
| Cookie | Purpose | Duration |
|---|---|---|
| __stripe_mid / __stripe_sid | Stripe — fraud prevention during checkout | 1 year / 30 min |
3. How to manage cookies
Our consent tool: When you first visit CalcStack, a cookie banner lets you accept analytics cookies, keep to essential cookies only, or choose your own preferences. No optional cookie is set before you choose. You can change your preferences at any time by clearing your calcstack_consent cookie (the banner will reappear on your next visit).
Browser settings: Most browsers let you block or delete cookies. Check your browser's help pages for instructions:
4. Impact of disabling cookies
If you disable essential cookies, some features (such as authentication) may not work correctly. Declining analytics cookies will not affect the core functionality of CalcStack — you can still use all calculators and tools.
5. Contact
If you have questions about our use of cookies, contact us at [email protected].
For more about how we handle personal data, see our Privacy Policy.