O.Tech vs Resonote
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O.Tech
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E' NATA LA NUOVA APP DI O.ERRE. O.Tech è in grado di configurare e comandare i recuperatori di calore Ghost di O.ERRE installati all'interno della vostra abitazione in modo semplice e immediato anche se ci si trova lontano da casa. I vari recuperatori possono essere configurati automaticamente o in modo manuale così che si comportino come un unico sistema di ventilazione oppure possano essere gestiti come unità singole di ventilazione. Con O.Tech sono impostabili più di dieci differenti modalità di funzionamento (Automatica, Manuale, Sorveglianza, Smart, Fuori Casa, Espulsione Temporizzata, Notte, Immissione, Estrazione, Flussi d'aria) e quattro portate d'aria. O.Tech si collega alle centraline metereologiche per la rilevazione delle condizioni ambientali esterne ed è in grado di monitorare lo stato della qualità dell'aria dell'abitazione tramite un sensore VOC installato a bordo macchina.
Resonote
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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.
Screenshots
Verdict
The clearest difference is update cadence: Resonote at every 10 days against O.Tech's every 7 months. Resonote also leads on device support. On price, in-app purchases and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
O.Tech ships an update every 7 months, Resonote every 10 days. The most recent releases landed on October 6, 2026 and October 21, 2026 respectively.
| Parameter | O.Tech | Resonote |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 7 months | Every 10 days — better |
| Ads | — | No |
| In-app purchases | No | No |
| Devices | — | iPhone, iPod — better |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 13 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | EP spa | Bas Spijkerman |
In-app purchases
O.Tech
No in-app purchases
Resonote
No in-app purchases









