A clear record of decay.
Compare isolated impulse captures, inspect the relative-energy curve and fit quality, then share a real comparison report.
From captures to a report
Import mono or stereo audio from Files. Select a channel and source start/end window; preview changes and listen to the selected window. Keep current and reference captures on one time axis. EDT, T20 and T30 show estimates in seconds with R² when the fits pass the checks; unavailable results retain reasons.
Create a PDF comparison and capture record, with additional pages for project notes, CSV curve samples and a JSON settings record. Preview the actual PDF and share individual files or all three through native iOS sharing. Named local projects retain up to twelve source captures with settings and notes. Reopen, duplicate and delete them.
Method and limits
Broadband Schroeder backward integration of squared samples. EDT fits 0 to −10 dB, T20 −5 to −25 dB and T30 −5 to −35 dB, extrapolated to 60 dB. Fits need R² at least 0.98 and pass clipping, interval, window-end and tail-energy checks. The last 10% estimates tail energy; this is a conservative guard, not a measured noise floor.
Use an isolated impulse response or impact recording without automatic gain. Music, multiple impacts, noise and short windows can invalidate estimates. No microphone recording, sweep deconvolution, octave bands, calibrated SPL, ISO-certified measurement, room certification or treatment recommendation. Small or non-diffuse rooms may not have one meaningful reverberation time.
Audio iOS can decode, mono or stereo, 0.08–60 seconds, 8–192 kHz, up to 64 MB and six million decoded channel samples. Each curve is independently normalized to 0 dB; plotted decay views focus on the visible 0 to −60 dB range. Full source windows and CSV values are retained. JSON is a settings record, not a source-audio backup.
Support
Email maga40@naver.com with your app version, device, audio format, duration, sample rate and a description of the issue. Include the selected window and any unavailable-fit explanation. Send source audio only if you intentionally choose to do so.
Privacy policy
Effective October 1, 2026. Gobling Company provides Reverna. The app has no account, advertising, tracking, analytics or third-party data SDK. It does not collect or transmit source audio, project names, notes, settings or exports to a developer server. Analysis and storage are local.
Only audio selected through Files is read. Projects store a local source copy, name, notes, channel and window settings. The library starts empty; the optional synthetic example is clearly labeled and is not a room measurement.
Sharing sends selected PDF, CSV and/or JSON files to a destination you choose. Reports include capture filenames, settings and optional notes. Review these before sharing. Destinations have their own privacy practices.
Deleting a capture or project removes its app-local source and settings. Uninstalling removes app-local data. Exported or previously shared copies remain at their destinations; delete them there. Device backups may include local data according to your Apple or computer settings. Save exports and keep separate source backups before deletion or uninstalling.
Support receives information you choose to email. Visiting this website makes ordinary requests to its hosting provider. Neither is required for local analysis or export.
Terms of use
Process and share only audio you have the right to use. Review estimates and reports before delivery. Reverna does not guarantee acoustic certification, fitness of treatment, regulatory compliance or professional acceptance. Keep separate source backups. Purchases follow App Store terms and applicable law.