Every app has its own support page with the questions that actually come up for it. Start there, or just email us — a person reads it. 每个 App 都有独立的技术支持页，写的是它自己真会碰到的问题。可以先看对应页面，也可以直接发邮件 —— 邮件是真人看的。
Email support@ai123.xyz. We reply within two business days. 邮箱 support@ai123.xyz，我们会在两个工作日内回复。
Wire sizing, voltage drop and ampacity — offline, on site.线径选型、压降与载流量计算 —— 完全离线，现场可用。
Offline wire sizing, voltage drop and ampacity for 12 V, 24 V and 48 V DC systems.面向 12 V / 24 V / 48 V 直流系统的离线线径选型、压降与载流量计算。
Wind triangle to magnetic heading, density altitude, crosswind, weight & balance, steep turns and time — offline, with the working shown.从风三角一路算到磁航向，还有密度高度、侧风分量、载重平衡、坡度转弯与时间工具 —— 完全离线，并且给出计算过程。
Offline wind triangle, density altitude, crosswind and weight & balance — with the working shown.面向飞行员的离线风三角、密度高度、侧风分量与载重平衡计算 —— 并且给出计算过程。
Offline, ad-free question bank离线 · 无广告的驾考题库
Practice for the Chinese driving-theory exams, offline: the full Kongmu 1 and Kongmu 4 bank with the regulation text behind every answer, a wrong-answer book, and timed mock exams.离线刷驾考理论题：科目一、科目四完整题库，每道题的解析都给到所依据的法条原文，另配错题本与限时模拟考。
Who takes what, how much is left, and when the next dose is due — on one screen.谁在吃、还剩多少、下一顿几点 —— 一屏看完。
A household medicine organiser for HarmonyOS: what is due today, how much is left, when it expires, and which reminders are queued — with an optional Huawei Account sync to share the cabinet with the family.HarmonyOS 上的家庭药箱：今天该吃哪些、还剩多少、什么时候过期、提醒排在哪；可选登录华为账号，把药箱共享给家人。
Within two business days, to support@ai123.xyz. Bug reports and data corrections jump the queue — in this line of work a wrong number is a safety problem, not a cosmetic one. 两个工作日内，回复到 support@ai123.xyz。缺陷反馈和数据更正确实会优先处理 —— 在这类工具里，算错数字是安全问题，不是体验问题。
Every app on this site is free, with no in-app purchases. If an app is ever sold or offers a purchase, the transaction is handled by Apple and refunds follow Apple's standard policy — request one at reportaproblem.apple.com. We cannot issue refunds ourselves, but if something went wrong we would like to hear about it. 本站的 App 目前全部免费，没有内购。将来若有收费或内购，交易由 Apple 处理，退款按 Apple 的标准政策执行，可在 reportaproblem.apple.com 申请。我们无法直接退款，但如果出了问题，希望你能告诉我们。
There is one per app, listed on the privacy page. We deliberately do not merge them into a single document — an app that collects nothing and an app that has an account are not the same promise, and one page cannot honestly cover both. 每个 App 一份，都在隐私页里列着。我们特意不把它们合并成一份 —— 「什么都不收集」和「有账号体系」不是同一个承诺，一页写不下也写不准。
They are listed on the home page, each with its own page. New ones appear there as they ship. 都列在首页，每个都有独立页面。新品上线后会加进去。
