NoiseLedger vs YHCipher

NoiseLedger is a privacy-first decibel meter and noise log for iPhone. Measure sound levels in real time, run overnight recordings, and export professional reports — with no ads, no account, no subscription, and no cloud. MEASURE WITH CONFIDENCE • Real-time dB with FAST/SLOW response, MIN / Leq / MAX • A, C and Z frequency weighting • iOS measurement mode: audio processing is switched off so readings are not altered • Calibration wizard plus built-in offset profiles for ~30 iPhone models • Honest clipping detection warns you when the mic reaches its limit PRO METRICS, COMPLETELY FREE • Noise dosimeter to NIOSH (85 dB, 3 dB) and OSHA (90 dB, 5 dB) standards • Live dose %, TWA and time-to-limit projection • Percentiles L10 / L50 / L90 / L95 • Time above threshold and a full dB histogram SEE THE SOUND • FFT spectrum with peak frequency readout • Scrolling spectrogram (waterfall) • 31 third-octave bands with peak hold DOCUMENT AND PROVE IT • Multi-page PDF report: chart, statistics, percentiles, dose and a threshold-exceedance table with start, end, duration and max • CSV and PNG export • Overnight and long-session recording with adaptive sampling, auto-stop timer and a quiet night preset • Session history with search, date and dB filters, tags, notes and markers • Trends dashboard: daily Leq, streaks, loudest day and hour PRIVACY BY DESIGN Audio is analysed live and never recorded or stored. No accounts, no analytics, no trackers, no cloud. Everything stays on your iPhone. You can erase all data at any time from Settings. ACCURACY NOTE NoiseLedger uses the built-in iPhone microphone, so readings are approximate and vary by device. It is a helpful indicator, not a certified instrument. For legal, workplace-compliance or safety-critical measurements, use a calibrated Class 1 or Class 2 sound level meter.

YHCipher is your all-in-one encryption and security toolkit. Whether you need to encrypt sensitive messages, generate secure passwords, or store private notes — YHCipher has you covered. CIPHER TOOLS - AES-256 Cipher — Military-grade AES-256-GCM encryption and decryption with password protection. - Morse Code — Convert text to Morse code and back with real-time translation. - Caesar Cipher — The classic shift cipher used since ancient Rome. Choose your own shift value. - Password Forge — Generate strong, customizable passwords with a visual slot machine animation. Control length, uppercase, numbers, and symbols. - Hash Generator — Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes with a satisfying scramble animation. - Base64 Codec — Encode and decode Base64 strings instantly. STEALTH NOTES - Face ID / Touch ID protected encrypted notepad. - Burn After Reading — Create self-destructing notes that are permanently deleted after viewing. - Save cipher tool results directly to your notes for later reference. - Apply cipher tools to your note content with one tap. CONVERSION HISTORY - Automatically tracks your conversion results across all tools. - Copy, save, or review past conversions anytime. - Toggle history on/off in Settings for full privacy control. DESIGNED FOR PRIVACY - All encryption happens locally on your device. - No data is sent to any server. - No account required. No tracking. No ads. - Biometric authentication protects your notes. YHCipher combines powerful cryptography tools with a sleek, spy-themed interface. Perfect for security enthusiasts, students learning about cryptography, or anyone who values digital privacy.