Kalven Privacy Policy
Kalven is a Chrome extension for commercial real estate (CRE) brokers. It assists with property prospecting, prioritization, and workbook generation. This policy describes what data Kalven collects, how it is stored, and where it is sent.
What Kalven Does
Kalven runs inside your existing authenticated CoStar and TitlePro247 browser sessions. It reads property data from web pages you are already logged into, sends that data to the Anthropic Claude API for structured analysis using your own API key, and generates a downloadable Excel workbook with property prioritization and outreach recommendations.
Kalven is a CRE prospecting and prioritization tool. It does not provide lending recommendations, credit decisions, property appraisals, or investment advice.
Data Stored Locally
Kalven stores the following data in your browser using Chrome's built-in extension storage:
- Anthropic API key — stored in
chrome.storage.local(persists across sessions, encrypted at rest by Chrome, never synced to any server, never transmitted anywhere except as an authentication header to the Anthropic API atapi.anthropic.com). - UI preferences — city, state, asset type, and filter settings are stored in
chrome.storage.session(ephemeral; cleared automatically when you close your browser). - Selector schemas and page structure metadata — cached in
chrome.storage.sessionfor internal selector resolution. These contain only structural information about page layout (tag names, attributes, element positions). They never contain property data, contact data, or loan data.
Property data, contact data, and financial data extracted from CoStar and TitlePro247 pages are held only in browser memory during your active session. They are never written to persistent storage, never synced, and never cached between sessions.
Data Sent Externally
Kalven sends data to one external service:
- Anthropic Messages API (
https://api.anthropic.com/v1/messages) — extracted property, financial, and contact data is sent over HTTPS for AI-powered analysis. These requests are authenticated with your own Anthropic API key. You are responsible for your API usage costs and for reviewing Anthropic's terms of service and privacy policy.
Kalven does not send data to any other third party, advertising network, analytics service, or data broker. No telemetry, usage analytics, or crash reporting is collected.
Data Generated Locally
Excel workbooks (.xlsx) are generated entirely within your browser using the ExcelJS library and saved to your Downloads folder via the Chrome downloads API. No workbook data leaves your browser.
Permissions
Kalven requests the following Chrome permissions:
| Permission | Purpose |
|---|---|
| tabs | Navigate and read CoStar and TitlePro247 tabs during analysis |
| storage | Store your API key and UI preferences locally |
| scripting | Execute extraction scripts on CoStar and TitlePro247 pages |
| sidePanel | Display the Kalven interface as a Chrome side panel |
| downloads | Save generated Excel workbooks to your Downloads folder |
| alarms | Keep the background service worker active during long batch analysis runs |
| tabGroups | Group platform tabs under a "Kalven" label for organization |
| debugger | Send trusted keyboard events to CoStar form fields that use strict input validation masks and reject standard programmatic DOM events |
Kalven also requests host permissions for product.costar.com, api.anthropic.com, and www.titlepro247.com to operate within your authenticated sessions and communicate with the Anthropic API.
Your Responsibilities
- You must provide your own Anthropic API key. You are responsible for all API usage costs incurred through Kalven.
- You must comply with CoStar's and TitlePro247's respective terms of service.
- Kalven does not independently access CoStar or TitlePro247. It operates exclusively within your own authenticated browser sessions using your own credentials. Kalven does not store your platform login credentials.
Data Retention
Kalven retains no property, contact, or financial data after your browser session ends. Your API key persists in local storage until you remove it or uninstall the extension. UI preferences are cleared automatically when you close your browser.
Changes to This Policy
If this policy changes, the updated version will be posted at this URL with a revised "Last Updated" date.
Contact
For questions about this privacy policy, contact: joe@kalven.ai