Calculate.
Keep it personal.
A scientific calculator with an encrypted album for the photos and videos you choose to keep private.
余数：科学计算器与本机加密相册。用自己的计算式解锁，主动备份，随时掌控。
Built around your control
No account, advertising or third-party analytics in the app. Back up manually through Files, including iCloud Drive. Your recovery key stays with you.