multiple operation calculator vs Proof Recorder

A calculator that calculates and displays four arithmetic operations and free time at the same time.

Built to protect you — a recording tool designed for moments that matter. The moment you open the app, recording starts. No buttons, no setup. Just open and record. Designed to waste not even a second in urgent situations. [ Key Features ] ■ Instant Recording on Launch Recording starts automatically the moment you open the app. No interaction needed — respond to urgent situations immediately. ■ Pause and Resume Record only the moments that matter. Pause and resume at any time during recording. Full control from Dynamic Island, Live Activity, and the home widget. ■ Auto-Send via Email When recording ends, the file is automatically sent to your configured email address. Presets for Gmail, Naver, Daum/Kakao, Yahoo, Yahoo! Japan, and iCloud. Full SMTP standard support (SSL/TLS and STARTTLS). ■ SHA-256 Hash Integrity Every recording is sent with its SHA-256 hash. Cryptographically prove that your file has not been tampered with — crucial for evidentiary reliability. ■ Lock Screen Control Center Widget Add the recording widget to Control Center and start recording directly from the lock screen. One tap, no app-hunting. ■ Live Activity Timer Recording time is shown in real time on the lock screen and Dynamic Island. Check your recording status without returning to the app. [ Privacy & Security ] ■ Direct SMTP, No Middleman Recordings are sent directly to your own email server. No third-party server in the middle, so your recordings are never exposed externally. ■ On-Device Processing All recording and processing happens on your device. Recordings are never uploaded to any external cloud. [ Technical Specs ] • Audio format: AAC (32kbps, 16kHz mono) • File size: ~0.24MB per minute (~14MB for 1 hour) • Attachment limit: 18MB (~75 minutes continuous) • Recordings under 3 seconds are auto-deleted (prevents accidental captures) • Background recording supported [ Recommended For ] • Those documenting unfair workplace situations • Those preserving important meetings or consultations • Those preparing for legal situations that require evidence • Those needing fast, secure voice memos Designed for urgent moments — start quickly, store safely. No complex setup. Just open, record, and let it send itself. That's all.