Butter is built on a simple principle: your financial information is yours. We process everything locally — no servers receive your data.
Last updated: May 27, 2026
Butter reads the visible text of checkout pages you visit — only to detect if you're on a checkout page and estimate the purchase amount. This analysis happens entirely in your browser. No page content is sent anywhere.
Your card wallet — a list of card product names you own — is stored in Chrome's encrypted sync storage. This is never card numbers, CVVs, or account details. Chrome encrypts this data and syncs it only between your own signed-in devices.
When you click Apply, we may receive a referral fee if you're approved. This never influences our recommendations, which are based purely on publicly available earn rates.
The reward calculator on our homepage runs entirely in your browser. No data is sent to any server at any point.
When you upload a bank statement at /analyse, it is read and processed entirely in your browser using JavaScript. Your statement is never uploaded, never stored on any server, and is cleared from memory when you close the page.
We may use minimal, privacy-respecting analytics (no cookies, no personal identifiers) to understand site traffic. We do not use Google Analytics.
storageSaves your card wallet (product names only, never card numbers) in Chrome's encrypted sync storage — available only on your own signed-in devices.
activeTabReads the visible text of checkout pages to detect whether you're on a payment page and estimate the purchase total. Analysis runs locally.
tabsOpens card application pages in a new tab when you click an Apply button.
notificationsSends optional alerts about upcoming welcome bonus deadlines. Only fires if you have an active bonus tracked.
Email us at privacy@butter.ca. We respond to all privacy inquiries within 48 hours.