What is CarSmarts?
CarSmarts is a free Safari (desktop and mobile) and Chrome (desktop) browser extension that enhances your car shopping experience on Aussie cars for sale websites. It automatically tracks listing prices, detects changes, and shows you insights that help you negotiate better deals.
Unlike other tools, CarSmarts is powered by crowdsourced data from all users. The more people use it, the smarter it gets.
Crowdsourced Insights
Explore Listing Data
Coming soon!
Listing Age Estimates
Know how long a car has been on the market. Older listings often mean more negotiating room.
Stamp Duty re-calculator
Instantly see the true drive-away cost with stamp duty calculated for your state, right on the search results.
Price Change History
With more data and more users, price change history becomes visible even for Dealer listings!
Personal Notes, and more
Add private notes to any listing. Fast access to your saved searches.
Community Data
Every user contributes to the collective intelligence. More users means better data for everyone.
Feature Screenshots
Always see driveaway price
Plugin control panel
Listing age insights
Highlight price drops
Dealer price drops and dates
See cheeky price increases
Install
CarSmarts is free, open source, and available now on the Chrome Web Store and the App Store. Install it, browse some listings, and you're already contributing to the community data pool. It runs on Chrome and Brave (desktop) and Safari (macOS, iPhone & iPad). We're actively developing new features and your feedback helps shape what comes next. If you have ideas, find a bug, or just want to say g'day, raise an issue on GitHub.
Installation instructions →Frequently Asked Questions
Is the extension open source?
Yes, the code is available to inspect on GitHub.
What data leaves my browser?
Only public car listing URLs supported by the tool and listed in the extension properties are summarized and sent to the carsmarts.app server. It is not active outside those URLs.
Does this hijack my browser?
The pages you fetch from car listings are inspected, no extra requests are made by the extension.
What personally identifying information is stored?
Your email address, if entered in the extension settings, is only used to count your contributions over time even if the extension is uninstalled and reinstalled. No other user knows what listings you are looking at or taking notes on. Notes are stored locally in your browser and are not sent to the server.
Who is developing this thing anyway?
My name is Justin, I live in Sydney, am a car nut that spends too much time window shopping car listings wondering if the listing is old or new. I also build other websites, and run satellitemap.space. My current daily driver is a 150cc moped.