# Resonote: Spectrum Analyzer — Tuner, Decibel Meter & Reverb > Tuner, Decibel Meter & Reverb (iPhone/iPad app by Bas Spijkerman.) - Source: https://appshunter.io/ios/app/resonote-spectrum-analyzer/id6804463455 (this page in markdown: same URL + `.md`) - Developer: [Bas Spijkerman](https://appshunter.io/developer/6792361856) - Category: Utilities - Price: Free - Age rating: 4+ - Requires: iOS 15.0 · 21 MB - Languages: American English, Dutch - Released: 2026-09-29 - Data updated: 2026-10-21 ## What is Resonote? Resonote is a sound analyser for musicians and acousticians. See the spectrum of anything the microphone hears, tune your instrument, measure sound levels and how long a room rings. Tap any peak to hear it. SPECTRUM AND SPECTROGRAM • Live spectrum from 20 Hz up, with the main peaks marked • Narrowband, or 1/1, 1/3, 1/6 and 1/12 octave bands (IEC 61260) • Tap a peak for its frequency, note, cents and harmonics • Hear any peak as a pure tone, made louder where the ear is less sensitive • Pinch to zoom: the zoomed chart resolves down to 0.7 Hz • Spectrogram with a log, linear or piano keyboard axis • A, C and Z weighting, Fast, Slow and Peak hold, FFT size 512 to 8192 • Keep a reference spectrum on screen to compare before and after TUNER • 35 instruments and a general mode: orchestral woodwinds, brass and strings, saxophones, acoustic guitar, piano, timpani, marimba, vibraphone, xylophone, glockenspiel and bells • Each instrument has its own overtone pattern, so a piano string's stretched partials or a bell's partials read as one note instead of several • Show partials 2 to 4 beside the note, each tuned on its own lane, with five seconds of history • Note names with sharps or flats, German (B and H) or do re mi, set automatically by your phone's language • Transposes for B-flat, E-flat and F instruments • Concert pitch 440 or 442 Hz, or your own; green within ±3, ±5 or ±10 cents SOUND LEVEL METER • dB SPL with A, C or Z weighting, Fast or Slow, Leq, Lmax and L90 • NR and NC ratings of background noise, and prominent tones in third octaves (ISO 1996-2) • Calibrate with your measurement microphone's calibration file, its sensitivity in mV/Pa, or a sound calibrator • Uncalibrated, it shows an estimate and tells you how far off it may be REVERBERATION TIME • EDT, T20 and T30 per octave (ISO 3382) • Measured from a hand clap or a balloon pop, with a step-by-step guide: where to stand, when to clap • Average up to ten measurements and see the spread in each band RECORDING • Record the raw microphone signal as a lossless WAV file, at the device's own sample rate • Your recordings go to iCloud Drive and are in the Files app BUILT TO MEASURE On iPhone, Resonote switches off the voice processing iOS normally applies to the microphone, so the levels you see are what the microphone really picks up. It works with the built-in microphone and with wired or USB measurement microphones. With AirPods connected, it still measures with the iPhone's own microphone. No account, no ads, no tracking. All analysis happens on your phone. ## Is Resonote safe? Not enough ratings yet to assess Resonote. ## Is Resonote legit? Resonote: Spectrum Analyzer has limited verification signals. The AppsHunter Legitimacy Score for Resonote is 58 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 3 releases) ### 1.2 — 2026-10-19 • Tuner: acoustic guitar • Tuner: a room's steady hum, in a train for example, no longer reads as a note • Tuner: the lanes say which way is flat and which is sharp, and an info button explains how to read them • Note names: do re mi, and Automatic, which follows your phone's language • The tuner asks once which instruments you play, then lists only those • Reverb: a step-by-step guide for the clap, and a simpler result: EDT, T20 and T30 per octave • Spectrum: fewer false peaks at the low end from room rumble • Z weighting now starts at 10 Hz, as IEC 61672-1 defines it • A measurement microphone's calibration file is applied only while a wired microphone is in use • With AirPods connected, the iPhone's own microphone measures; tones still play in your AirPods ### 1.1 — 2026-10-12 Acoustic Analyser is now Resonote, with a new icon. • Nederlands: the app now speaks Dutch, following your phone's language. • Sharper zoom: pinch into the spectrum and the chart now resolves finer detail across the zoomed band, down to under 1 Hz, so close tones show as separate peaks. • Reverb for musicians, sized to your room: choose the room's size, from practice room to concert hall, and the Musician view judges the reverberation against the targets for a room that size. It shows which uses the room suits (speech, amplified, loud or quiet acoustic music) and gives tips on what to do about it. • A guide before the first clap shows where to put the phone, how far away to clap, and the steps, in both views. • More reliable claps: a clap too close to the phone is now left out of the result, and a clap that clips is not kept, so it can't skew the average. • Tuner partials: Partials 1–4 now shows the note's overtones beside it, each with its own reading in cents, including a piano's stretch. • Tidier controls: control rows fill the width, and nothing shifts when you change a setting. • Plus many smaller fixes and refinements. ### 1.0 — 2026-09-29 No release notes. ## Apps similar to Resonote | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sound Scope Analyzer](https://appshunter.io/ios/app/sound-scope-analyzer/id6813038344) | — | Free | Utilities | | [OverTune](https://appshunter.io/ios/app/overtune/id6758831022) | — | Free | Utilities | | [O.Tech](https://appshunter.io/ios/app/otech/id6449295462) | — | Free | Utilities | | [AcousticCheck](https://appshunter.io/ios/app/acousticcheck/id6737261712) | — | Free | Utilities | | [WebBLE](https://appshunter.io/ios/app/webble/id1193531073) | 2.6 (43) | $1.99 | Utilities | | [Ambientika App](https://appshunter.io/ios/app/ambientika-app/id6450736235) | — | Free | Utilities | ## More apps by Bas Spijkerman - [Tectonic Star](https://appshunter.io/ios/app/tectonic-star/id6792361854) All apps by Bas Spijkerman: https://appshunter.io/developer/6792361856 ## Related topics [pcap analyzer](https://appshunter.io/ios/topics/pcap-analyzer) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-21.*