Cookie Policy
Last Updated: April 16, 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, keep you signed in, and understand how you use the site. Similar technologies include local storage and session storage, which serve comparable purposes.
This Cookie Policy explains what cookies Prosperics uses, why we use them, and how you can control them. This policy should be read alongside our Privacy Policy, which provides full details about how we handle your personal data.
2. Essential Cookies
These cookies are strictly necessary for the website to function. They cannot be disabled.
| Cookie | Purpose | Duration |
|---|---|---|
| __Secure-next-auth.session-token | Keeps you signed in to your Prosperics account. Set after you log in. | Session / 30 days |
| __Secure-next-auth.csrf-token | Protects against cross-site request forgery attacks on login forms. | Session |
| __Secure-next-auth.callback-url | Remembers where to redirect you after signing in. | Session |
| cookie_consent | Stores your cookie preferences (local storage). Required to remember your consent choices. | Persistent |
3. Analytics & Product Cookies
These cookies help us understand how visitors use our site so we can improve it. They collect information anonymously and in aggregate. These are only set if you consent.
| Cookie | Provider | Purpose | Duration |
|---|---|---|---|
| _ga | Google Analytics | Distinguishes unique visitors by assigning a random ID. | 2 years |
| _ga_* | Google Analytics | Maintains session state (pages viewed, time on site). | 2 years |
| ph_*_posthog | PostHog | Product analytics: distinguishes devices, stores feature-flag assignments, and (with consent) records anonymized session replays with financial inputs masked. PostHog is SOC 2 Type II certified and stores data in the United States. | 1 year |
| sentryReplaySession | Sentry | Error and performance monitoring, including sampled Session Replay. All text is masked by default and media is blocked; we use replay to reproduce crashes, not to profile users. | Session |
We use Google Analytics with Consent Mode v2, which means analytics and session data is only collected after you grant consent.
4. Security & Anti-Abuse Cookies
These cookies and tokens help protect your account and our services from fraud, bots, and abuse. Because they are strictly necessary to deliver a secure service you have requested, they are set without requiring consent under the ePrivacy Directive and CCPA.
| Cookie / Token | Provider | Purpose |
|---|---|---|
| cf_clearance / cf_bm | Cloudflare Turnstile | Bot detection and CAPTCHA solution used on sign-in, sign-up, and sensitive forms. Cloudflare also receives your IP address. |
| Upstash rate-limit keys | Upstash (server-side only) | Server-side Redis counters keyed on IP address and user ID to rate-limit abusive requests. Not stored in your browser. |
5. Advertising Cookies
These cookies are set by our advertising partners - Google AdSense and Ezoic - to serve ads and measure their effectiveness on the free tier. These are only set if you consent.
Google, Ezoic, and their downstream advertising partners may set cookies to:
- Show you relevant ads based on your browsing interests
- Limit the number of times you see a particular ad
- Measure the effectiveness of advertising campaigns
- Detect and prevent ad fraud
For more information about how Google uses data, see the Google Privacy & Terms. You can manage your ad preferences in Google Ads Settings. A full list of Ezoic's downstream ad and analytics vendors is available inside the Ezoic consent dialog, and Ezoic's privacy notice is published at ezoic.com/privacy-policy.
6. Local Storage
In addition to cookies, we use browser local storage to save preferences that improve your experience:
- Country preference — Remembers whether you're using US or Canadian calculators.
- Cookie consent — Records your cookie choices so we don't ask you again.
- Calculator inputs — Temporarily saves your calculator entries during your session so you don't lose work.
Local storage data stays on your device and is never sent to our servers.
7. Managing Your Cookie Preferences
You can control cookies in several ways:
On Prosperics
Use our cookie consent banner (shown on your first visit) to accept or reject non-essential cookies. You can change your preferences at any time by clicking "Cookie Settings" in the footer of any page.
In Your Browser
Most browsers let you block or delete cookies through their settings. Note that blocking essential cookies may prevent you from signing in or using certain features.
Global Privacy Control (GPC)
We honour the Global Privacy Control signal. If your browser sends a GPC signal, we treat it as an opt-out of non-essential cookies and data sharing.
8. Regional Rights
EU / EEA (GDPR)
We require your opt-in consent before setting analytics or advertising cookies.
California (CCPA / CPRA)
You may opt out of the "sale" or "sharing" of personal information collected via advertising cookies. Visit our CCPA Opt-Out page.
Canada (PIPEDA)
We obtain meaningful consent before collecting personal information through non-essential cookies.
9. Changes to This Policy
We may update this Cookie Policy from time to time. Changes will be posted on this page with a revised "Last Updated" date. Continued use of the site after changes constitutes acceptance of the updated policy.
10. Contact Us
If you have questions about our use of cookies, contact us at contact@prosperics.com.
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