Doujin Chart

Doujin Chart is a browser extension that automatically adds price history charts to Fanza (DMM.com Doujin) and DLsite doujin product pages. Set a target price and receive an email when the price drops to that amount. 【Recommended for】 - Users who want to buy favorite doujin works at a target price - Users who want to compare prices across Fanza and DLsite when the same work is available on both services - Users who do not want to manually check every sale 【Main features】 1. Price history chart: Displays price changes over time in a step chart. Prices from Fanza and DLsite can be shown together in one graph. 2. Sales count chart: Shows daily sales counts as a line chart so you can watch popularity trends. 3. Target price alerts: Enter a target price in the alert tab and receive an email when the price drops. 4. Period selector: Switch between 1 week, 1 month, 3 months, and all time. 5. ON/OFF toggle: Enable or disable the extension from the toolbar icon. 【Supported sites】 - Fanza doujin product pages (https://www.dmm.co.jp/dc/doujin/-/detail/* ) - DLsite product pages (https://www.dlsite.com/*/work/=/product_id/RJ* ) The extension does nothing outside these pages. 【Account registration】 An account is required only for target price email alerts. Viewing price charts does not require login. Email verification is required during registration. 【Privacy】 See the privacy policy for details about collected data and usage. - Privacy policy: https://ninesteps.co.jp/doujinchart/privacy.html Summary: - The extension sends the current price, sales count, observation time, and product page URL to the price history API. The URL is stripped to origin and path before sending. - Email address, password, target price, and product URL are sent only when using target price alerts. - Display settings are stored only in your browser via chrome.storage.local. - Authentication tokens are stored only in your browser and sent only to our API server for authenticated requests. - Price history, statistics, and records obtained from target pages may be stored continuously to display price trends, provide statistical history, and maintain service quality. - Access logs, error logs, and security logs are generally retained for up to 90 days, then deleted or anonymized. - Cloudflare may process technical information for static file delivery on the developer site, but it is not used as storage for account information, alert settings, price history, or other application data. 【Notes】 - This extension is an independent third-party tool and is not affiliated with DMM.com Co., Ltd. (Fanza) or EISYS, Inc. (DLsite). "Fanza" and "DLsite" are trademarks of their respective owners. - The extension supports doujin product pages. Please follow the age ratings shown by each service. - Chart accuracy and completeness are not guaranteed. Charts may not appear if price or sales data cannot be retrieved. 【Contact】 - Support: extensions@ninesteps.co.jp - Website: https://ninesteps.co.jp/doujinchart/ 【Changelog】 - v1.0.0: Initial release.