TrueHammer

About

TrueHammer calculates and displays the estimated total out-the-door (OTD) price—inclusive of buyer fees, local sales tax, and registration/flat fees—directly inside auction pages and listings on Bring a Trailer and Cars & Bids. 

Features:
- Auto-calculates progressive platform buyer fees (including motorcycle/tractor category rules on BaT).
- Computes local sales tax based on customizable tax profiles (supporting both hammer-only and hammer-plus-fee tax bases).
- Adds flat fees (such as registration, doc, or transport fees).
- Annotates listings directly in grids, search results, individual auction headers, bid histories, and comment threads.
- Completely offline, privacy-focused calculation. No data leaves your machine.

How to Use:
1. Click the TrueHammer icon in your browser toolbar to create a Tax Profile.
2. Enter your local tax rate, specify if tax applies to the buyer's fee, and add any flat fees.
3. Browse Bring a Trailer or Cars & Bids—estimated OTD prices will appear automatically next to current bids.
4. Hover over any OTD price to see the detailed cost breakdown.

Privacy & Permissions:
All data is stored locally in your browser's secure storage. TrueHammer does not track, collect, or transmit any user details.