dB Meter & Spectrum Analyzer vs OCRBook

"The best way to meter sound levels" - AppAdvice Decibel Meter is full of features sound level meter with exclusive accuracy of measurements and integrated spectrum analyzer. Calibrated with professional dB meter. The world is a noisy place: cars, power tools, crowds, machinery, and other common sources produce amounts of noise that can, with continued exposure, lead to permanent hearing loss. Sound level meters are useful for anyone who wants to avoid exposing their ears to harmful noise levels, but who wants to spend hundreds of dollars on one? dB Meter is free app which provides professional-quality measurement results, calibrated using an actual Nor140 high-precision decibel meter. With dB Meter, you can measure ambient noise levels, save your measurements and their locations, and share your measurements with others. dB Meter couples utility with stylish design and a polished user experience: a powerful tool in a sleek package, and at a tiny fraction of the cost of professional sound level meters. (Please note that dB Meter soundmeter app is not a replacement for professional devices and should be used for personal purposes only.) FEATURES: ● Health App integration. Export measured noise levels and audiogram directly to Health app. ● Noise dosimeter regarding NIOSH and OSHA standards ● Photo & video with the noise overlay ● Powerful hearing test ● Saves location data for each measurement. ● Save measurements with custom names and rename existing measurements. ● Export measurements in CSV or Audio format. ● Allows you to save, export and play back recorded measurements. ● Highly accurate measurements. ● Integrated Fully Functional Spectrum Analyzer ● Octave Band Real Time Analyzer ● FFT Plot (Fast Fourier Transform) ● Spectrogram ● Linear and logarithm scales ● Up to 16384 FFT size ● A lot of available window functions ● Tracking for max value ● Max and Min for any selected frequency ● Stunned graphics You can enable or disable noise levels data exporting to Health app in dB Meter Pro app settings. Have any questions or suggestions? Write to us: support@dbmeterpro.com DB Chart 150-160 dB = Eardrum rupture 140 decibel = Aircraft carrier deck. 130 dB = Jet take-off (100 meters), gun blast at close range. 120 dB= Human pain threshold, loud rock concert. 110 decibel = Serious hearing damage if sustained for more than 1 hour. 100 dB = Serious hearing damage if sustained for more than 8 hours. 90 decibel = Likely hearing damage if sustained for more than 8 hours. 80 decibel = Potential but unlikely hearing damage if sustained for more than 8 hours. 70 dB = Just annoying, but probably safe. 60 dB= Typical conversational volume. 50 dB = A quiet, library conversation. 40 decibel = A whisper. 30 dB= Barely audible sound. 20 decibel= Threshold of human hearing.

Turn scanned books and PDFs into clean, searchable, and easy-to-read text with fast OCR and private AI assistance. OCRBook converts scanned pages into structured text, generates clear summaries, and lets you listen with natural TTS. OCR runs directly on your device, while AI features connect securely to your own home or private AI server — not a public cloud. Key Features - Fast & Accurate OCR Extract text from scanned books, documents, and PDFs Multi-language support powered by Apple Vision Enhanced recognition for curved pages and low-quality scans Batch processing for entire documents - Private AI Summaries Generate chapter or full-book summaries via your personal AI server No public cloud processing or shared infrastructure Ideal for studying, reviewing, and quick understanding You stay in control of where AI processing happens - Natural Text-to-Speech Listen to scanned text with high-quality system voices Continuous reading across pages Adjustable speed and language Background playback supported - Smart File Management Import PDFs from Files, iCloud Drive, or other apps Export OCR results as searchable TXT or ZIP files Organize books with tags and metadata Fast Spotlight search across your library - Powerful Search Instant full-text search across all OCR content Context snippets show exact match locations Filter by book, date, or tags - Privacy-First Design OCR runs locally on your device AI connects only to your own remote or home server No tracking, no analytics, no automatic uploads Your data stays under your control Perfect For Students and researchers Personal ebook digitization Archive and document management Anyone working with scanned PDFs Why OCRBook? Because scanned books should be readable, searchable, and understandable. OCRBook turns raw scans into clean text and pairs them with private AI tools — without handing your data to public cloud services.