Costline

Track holdings against your cost basis. Inline intraday sparkline per card. Yahoo Finance data.

Costline — 股票成本基準線追蹤器 | 即時損益 | K 線走勢圖 你知道自己的持股現在賺了多少嗎？ Costline 讓你在 Chrome 瀏覽器裡，一眼看清每一檔股票的即時損益、成本基準線、當日走勢。 不用開股票軟體，不用登入任何帳號，點一下就知道今天賺了還是賠了。 ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ 核心功能 🔴 成本基準線走勢圖 輸入你的平均買入成本，每張持倉卡片直接顯示當日走勢圖，圖上有一條你的成本虛線，今天超過你的成本就是賺，低於就是賠。開盤到收盤的完整時段，左到右依序排列。 📊 當日損益 × 總損益 同時顯示 每檔股票分開顯示「當日損益」和「總損益（持有報酬）」。投資組合總覽自動彙總，切換群組即看該群組的整體績效。 🔍 Yahoo 財經搜尋直接加入 搜尋代號或中文名稱，從 Yahoo Finance 即時比對，選好就加入。平均成本、股數、總金額填兩個自動算第三個。 🗂 自訂群組分類 建立「核心部位」、「衛星持倉」、「ETF」等群組，每個群組獨立顯示總損益，排序也各自記憶。 🌓 深色 / 亮色模式 亮色介面不顯眼，上班偷看也不容易被發現。深色護眼，晚上看盤舒適。 👁 隱私模式（三段切換） - 完整顯示 - 隱藏所有金額（保留報酬率 %）— 給朋友看績效時使用 - 全部隱藏（只留代號、股價、走勢圖）— 直播或截圖分享 🌍 全球市場支援 台股（上市 / 上櫃）、美股、日股、港股、韓股、英股、德股、澳股、新加坡、印度、加拿大，各市場依正確時區判斷開盤 / 收盤狀態。 ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ 為什麼選 Costline？ 一般股票追蹤工具只告訴你「現在多少錢」，Costline 告訴你「相對於你買的價格，現在賺了還是賠了、賺了多少」。這才是你真正需要知道的事。 ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ 資料安全 × 隱私保護 🔒 所有持倉資料（代號、成本、股數）僅存在你自己的瀏覽器本機（chrome.storage.local），不傳送至任何伺服器，不收集任何個人資料，不需要帳號，不需要 API 金鑰。 行情資料來源：Yahoo Finance 公開報價（延遲約 15 分鐘）。 本工具僅供個人參考，不構成投資建議。 ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ 支援語言 繁體中文 / English（右上角一鍵切換） ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ 適合誰使用？ - 上班族 — 想在瀏覽器低調追蹤持股，不想開股票 App - 台股長期投資者 — 想隨時確認持有報酬率 - ETF 存股族 — 追蹤 0050、00878、00919 等 ETF 的成本與損益 - 多市場投資人 — 同時持有台股、美股、日股 ━━━━━━━━━━━━━━━━━━━━━━━━━━ Costline — Stock Cost Basis Tracker | Real-Time P&L | Intraday Chart Do you know exactly how much your portfolio is making right now? Costline lets you view the real-time P&L, cost basis line, and intraday trends of every stock directly in your Chrome browser. No stock apps needed, no logins required—just click to see if you are up or down today. ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ Core Features 🔴 Cost Basis Intraday Chart Enter your average purchase cost, and each position card will show an intraday trend chart with a dashed line representing your cost basis. If the price is above the line, you are in the green; below it, you are in the red. View the full trading session from market open to close, ordered from left to right. 📊 Simultaneous Display of Daily P&L & Total P&L Each stock clearly displays its "Daily P&L" and "Total P&L (Holdings Return)." The portfolio overview automatically aggregates your total performance, updating instantly when you switch groups. 🔍 Direct Import via Yahoo Finance Search Search by ticker symbol or company name with real-time matching from Yahoo Finance. Simply select to add. Fill in any two of Average Cost, Shares, or Total Amount, and the third calculates automatically. 🗂 Custom Portfolio Grouping Create custom groups like "Core Portfolio," "Satellite Positions," or "ETFs." Each group displays its own independent total P&L and saves its unique sorting preference. 🌓 Dark / Light Mode The light interface is subtle, perfect for a quick, discreet check during office hours. The dark mode protects your eyes for comfortable late-night tracking. 👁 Privacy Mode (3-Way Toggle) Full Display: Shows all data. Hide Amounts: Shows only return percentages (%)—ideal for sharing performance with friends. Hide All: Displays only tickers, prices, and charts—perfect for live streams or screenshots. 🌍 Global Market Support Supports Taiwan (TWSE/TPEx), US, Japan, Hong Kong, South Korea, UK, Germany, Australia, Singapore, India, and Canada. Market open/close status is automatically determined by the local time zone. ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ Why Choose Costline? While regular stock trackers only show you "the current price," Costline shows you "how much you are making or losing relative to your purchase price." That is the metric that actually matters to your wealth. ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ Data Security & Privacy Protection 🔒 All portfolio data (tickers, costs, shares) is stored locally in your own browser (chrome.storage.local). No data is sent to any server, no personal information is collected, and no accounts or API keys are required. Market Data Source: Yahoo Finance public quotes (approx. 15-minute delay).This tool is for personal reference only and does not constitute investment advice. ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ Supported Languages Traditional Chinese / English (One-click toggle in the top-right corner) ━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ Who Is It For? Office Workers: Keep a low-profile track of your stocks in the browser without opening stock apps. Long-Term Investors: Check your total holding returns at a glance. ETF Investors: Easily track the cost basis and P&L of your favorite ETFs. Global Investors: Manage a multi-market portfolio across Taiwan, US, and Japanese stocks simultaneously.