CRX id
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Description from extension meta
See every price in satoshis. Understand the Bitcoin opportunity cost of your purchases.
Image from store
Description from store
Think in sound money, everywhere you browse.
Opportunity Cost instantly shows the price of products and services in bitcoin ( ₿ / sats ) next to the original fiat amount. No more mental math or tab-hopping to converters—just a constant reminder of what spending really costs in Bitcoin terms.
Key features
Automatic price detection & conversion – Detects 10+ local currencies and shows the live satoshi equivalent right on the page.
Real-time rates – Pulls spot prices from reliable Bitcoin exchanges every ~30 seconds for up-to-date conversions.
Inline or tooltip display – Choose a subtle gray sats value beside the price, or a tooltip that appears on hover.
Dark mode support – Looks great in light or dark themes, automatically matching your browser’s appearance.
Quick toggle – Click the toolbar icon to pause/enable on the current site or everywhere.
Customisable – Pick your preferred currency, number format (sats / BTC), display precision and refresh interval.
Zero sign-up, zero tracking – We collect no personal data. All parsing and settings storage happens locally (via IndexedDB); the only outbound request is for a BTC/FIAT price feed.
Open-source – View the code, file issues or contribute on GitHub.
Permissions note
This extension uses the tabs permission solely to support per-site toggling, allowing you to enable or disable Bitcoin pricing on specific websites.
Latest reviews
- (2025-08-13) Jeremy Epstein: This is brilliant...and it works
- (2025-08-09) Izwan Zakaria: Also include Malaysian Ringgit (MYR) to Bitcoin (BTC) conversion rates
- (2025-08-09) John Walker: very cool, such a brilliant idea.
- (2025-08-07) Benjamin Ohman: Change the way your Brain thinks about money and value in a tangible way
- (2025-07-15) Paul Allen: Pretty cool!
- (2025-07-02) Delta One: Superb and unique!
- (2025-06-28) DCA Signals: This is one of the best tools to "get a feel" for bitcoin's value in relationship with goods and services in the economy. It's a timeless tool and a must-have companion for any bitcoiner who wants to learn about bitcoin's value.
- (2025-06-20) Kyle Smith: A brilliant extension. Showing us the true cost of things.
- (2025-06-18) Oscar Alviar: Pricing my life in bitcoin. Nice.
- (2025-06-16) Brian Prince: Awesome tool to help understand the Satoshi to $USD relationship with prices -- keep up the great work TFTC!
- (2025-06-12) A Lane: Excellent extension.
- (2025-06-12) Eduardo Herculano: waiting for Brazilian Real
- (2025-06-12) Rodrigo Cuesta: Living in a Bitcoin Standard. Perfect.
- (2025-06-11) Frank Garcia: Price the world in real money
- (2025-06-11) Zhane Grey (Mooncrawler): bitcoin to the moon
- (2025-06-11) DreamyStorytime: can u make it for turkish lira TRY ? thanks
- (2025-06-10) T C: Working well! This is now my second favorite extension.
- (2025-06-10) Anzor Mzhavanadze: Brilliant!
- (2025-06-10) Skyler FS: Man this is so cool. Love seeing the world priced in SATS. Also, the the quick converter at the top is awesome.