Overtone Lab: Acoustics & RT60
Tuning, Tempo, Delay & Reverb
$9.99
Overtone Lab is a precision calculation studio for musicians, instrument builders and audio engineers — 26 exact tools in one offline app, in seven sections.
TUNING
• Partch — just intonation, cents, nearest just ratio, Tenney height
• Comma — equal divisions (EDO) & historical temperaments
• Mersenne — string tension, frequency & fret spacing
TIMING
• Tempo — note & bar lengths, time↔samples, varispeed
• Delay — tempo-synced delay, distance alignment, comb filtering
• Timecode — SMPTE 24 / 25 / 30 & 29.97 drop-frame
• Pitch — note↔frequency↔wavelength, harmonics, beats, Doppler
ACOUSTICS
• Sabine — room reverberation (RT60), Schroeder frequency, room modes
• Webster — exponential horn cutoff & Helmholtz resonance
• Bernoulli — open/closed pipe resonance & end correction
• Formant — vocal-tract formants & vowel presets
• SPL — inverse-square distance law & source summation
• Room Modes — axial/tangential/oblique modes, Bonello & Sepmeyer ratios
• Air — atmospheric absorption & speed of sound (ISO 9613-1)
• SBIR — speaker-boundary interference & comb filtering
SIGNAL
• Butterworth — filter response & Linkwitz-Riley crossovers
• Fletcher — A / C / Z frequency weighting
• Benchmark — real ITU-R BS.1770 integrated loudness (LUFS) & streaming targets
• Passive — RC / RL / LC filter corners
• Biquad — digital IIR filter coefficients (RBJ cookbook)
• Compressor — gain computer, soft knee & attack/release time constants
STEREO
• SRA — stereo recording angle for mic arrays (ORTF, NOS, DIN, Blumlein)
UTILITY
• Levels — decibels, dBu / dBV, dynamic range
• File — uncompressed size, sample rate & Nyquist frequency
• Pan — equal-power & linear pan law
DESIGN
• Thiele — Thiele-Small sealed & ported loudspeaker enclosures
Every result is computed from published formulas and validated against reference sources. Type any value and the whole screen recomputes instantly.
100% offline — no account, no network, no tracking, no subscription. Buy once, use forever. Universal for iPhone, iPad and Mac.
Estimates for design and study; cross-check critical work against measurement.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Refined the App Store search terms so the listing reaches the musicians, instrument builders and audio engineers the app is actually for.
Same 26 tools, same offline calculations, same one-time purchase.
The developer, Koreniuk Oleksandr, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Koreniuk Oleksandr
- Size
- 7.4 MB
- Category
- Music
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later. - Apple Vision
Requires visionOS 26.0 or later. - Apple Watch
Requires watchOS 26.0 or later.
- iPhone
- Languages
English and 16 more
- English, Czech, Dutch, French, German, Greek, Hungarian, Italian, Japanese, Korean, Polish, Portuguese, Romanian, Spanish, Swedish, Turkish, Ukrainian
- Age Rating
4+
- 4+
- Copyright
- © Oleksandr Korenyuk 2026
