更新日期：2026-09-17
Cifra 不设账号，也不把计算内容上传到我们的服务器。
主题、语言、工具开关、历史记录与手写笔迹保存在本机。
汇率默认使用内置对照表。只有你点「刷新」时，App 才会向 ExchangeRate-API（open.er-api.com）请求公开汇率。该请求会经过互联网，服务方可能处理 IP 地址等网络信息，用途仅限返回汇率，不用于广告或跨 App 追踪。数据提供方：ExchangeRate-API。
手写识别在设备端完成。BMI、房贷与利息结果仅供参考，不能替代医疗、贷款或投资建议。
我们不使用广告识别符，不为第三方投放广告。
如有问题，请发邮件至 617505819@qq.com。
Last updated: 2026-09-17
Cifra has no accounts and does not upload your calculations to our servers.
Theme, language, tool switches, history, and handwriting stay on this device.
Currency conversion uses a built-in table by default. Only when you tap Refresh does the app request public rates from ExchangeRate-API (open.er-api.com). That request goes over the internet; the service may process network information such as IP address, solely to return rates—not for ads or cross-app tracking. Provider: ExchangeRate-API.
Handwriting recognition runs on device. BMI, mortgage, and interest results are for reference only and are not medical, loan, or investment advice.
We do not use the advertising identifier and do not serve third-party ads.
Contact: 617505819@qq.com