Otum 用最生活化的白話文和圖解，帶你看懂前端、後端、資料庫到系統架構的運作原理——不用寫一行程式，也能聽懂科技世界怎麼運作。每篇文章的技術解說免費閱讀，白話文、圖解與深度問答為付費內容。
付費解鎖是怎麼收費的？
採一次買斷、永久解鎖——沒有訂閱、沒有月費。解鎖後可閱讀全站文章的白話文、圖解與深度問答，日後新增的內容也不用再付費。
我需要註冊或登入帳號嗎？
不需要。免費閱讀與付費解鎖都不需要登入或註冊——付費採匿名購買，購買權益綁定你的 Apple ID。
換手機或重新安裝後，購買不見了怎麼辦？
購買權益綁定你的 Apple ID。請開啟付費解鎖頁面（購買頁），點右上角的「恢復購買」，即可還原你的解鎖狀態，無需登入、無需再次付費。
怎麼切換語言？
到「設定 → 語言」可選擇跟隨系統、繁體中文或 English，切換即時生效。
你們會保存我的個人資料嗎？
不會。付費採匿名購買，我們只在伺服器保存一組交易識別碼與解鎖狀態，用來確認你的購買權益，不含姓名、電子郵件或任何可識別你本人的資料。App 不需登入、不建立帳號。
還有其他問題？歡迎來信，我們會盡快回覆：
Otum uses plain, everyday language and illustrations to help you understand how frontend, backend, databases, and system architecture actually work — no coding required. The technical explanation of every article is free to read; the plain-language sections, diagrams, and in-depth Q&A are paid content.
How does the paid unlock work?
It's a one-time purchase with permanent access — no subscription, no monthly fees. Once unlocked, you can read the plain-language sections, diagrams, and in-depth Q&A across all articles, including content added in the future.
Do I need to register or sign in?
No. Neither free reading nor paid unlock requires sign-in or registration — purchases are anonymous, and your entitlement is tied to your Apple ID.
I switched phones or reinstalled — my purchase is gone. What now?
Your entitlement is tied to your Apple ID. Open the paid unlock (purchase) screen and tap Restore Purchases in the top-right corner to restore your unlock — no sign-in and no additional payment required.
How do I change the language?
Go to Settings → Language to choose Follow System, 繁體中文, or English. Changes take effect immediately.
Do you store any of my personal data?
No. Purchases are anonymous — we store only a transaction identifier and unlock status on our server to confirm your entitlement, with no name, email, or any data that identifies you. The App requires no sign-in and creates no account.
Still need help? Email us and we'll get back to you as soon as we can: