ZNotePad vs Echorooms

This app is used to organizes your collections of notes, letters, articles, studies, lectures, reports, research papers, documents, accounts, passwords, software serial numbers, audios, and videos materials into a single document collection. You create multiple collections of various subject matters for your personal use as well sharing with your friends and colleagues. Read user manual at https://zynergyapps.com/docs/NoteDoc.pdf

Echorooms estimates how your room sounds — reverberation time (RT60) per octave band, clarity and early decay — from a short click and your device's microphone, then helps you plan treatment and check whether it worked. One purchase, no subscription, no account. NEW IN 4.0 • Standards-style decay analysis: the decay is Schroeder-integrated with background-noise compensation and evaluated over T30, T20 or T10, depending on how far it rises above the room's noise. Every reading shows which range was used; captures with under 25 dB of range are refused instead of guessed. • Finer clarity: C50, C80, D50, centre time and EDT now use a 1 ms envelope, so the 50 and 80 ms boundaries are exact. • Treatment plan from a saved reading: enter the room size, pick an absorber and the surface it covers, and see predicted RT60 in each band plus the area needed to reach a target. • PDF reports with values, method, capture origin and limits. • Backup & restore of readings and Desk sessions. Restoring only adds missing records and saves a copy of your current data first. • Corrected references: air absorption from ISO 9613-1, NR from the ISO noise-rating curves, STI from the IEC 60268-16 diffuse-field model, published room ratios plus the ITU-R BS.1116 check. ALSO INCLUDED • RT60 per octave band 125 Hz–4 kHz, bass ratio, averaging of several captures • Repeatability Desk: baseline vs follow-up medians, observed spread and an evidence CSV • Sabine/Eyring treatment calculator and a material library with octave-band absorption coefficients • Room modes, Bonello criterion, background noise (NC/NR) and speech intelligibility (STI, %ALcons) estimates • History, before/after comparison, CSV export and an acoustics glossary WHAT TO KNOW A phone speaker click is not an ideal impulse and the built-in microphone is not a calibrated measurement microphone, so results are planning estimates, not a certified ISO 3382 or ANSI measurement. Readings saved before 4.0 keep their original values and are labeled with the older method. Simulator and example readings are labeled and are not measurements of your room. Everything stays on your device: no tracking, no ads, no cloud. iPhone and iPad.