# OCTAV — SPL Meter, RTA, Tuner — Built for Live Sound Engineers > Audio analysis suite for sound engineers: SPL meter, RTA, tuners, generators, and more. (iPhone/iPad app by Skeptical LLC (Company/Organization).) - Source: https://appshunter.io/ios/app/octav-spl-meter-rta-tuner/id6803230381 (this page in markdown: same URL + `.md`) - Developer: [Skeptical LLC (Company/Organization)](https://appshunter.io/developer/6803230383) - Category: Utilities, Music - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 18.0 · 12 MB - Languages: American English - Released: 2026-08-25 - Data updated: 2026-10-24 - Monetization: freemium ## What is OCTAV? OCTAV is an instrument panel for working sound engineers: a calibrated SPL meter, a 31-band RTA, a chromatic and drum tuner, and a tone and noise generator, all on one device, all running locally. The SPL meter is built for real work. A/C/Z weighting, Fast and Slow time constants, Max/Min/Peak holds, Leq, and a rolling 60-second history graph give you numbers you can defend. Mic calibration offsets and saved input profiles keep readings consistent across venues. A NIOSH noise-dose clock with escalating hearing-damage alerts is included and never gated behind a paywall — safety instrumentation should not be sold. Tuning covers more than pitch. The chromatic tuner handles any instrument, while the drum tools add a kit calculator, target pitches per drum, and lug-by-lug matching that shows exactly which lugs are out and by how much. The tone generator produces sine, square, triangle and saw waveforms with frequency sweeps and click-free parameter changes, useful for line checks, alignment, or ear training. Pink, white and brown noise generators are included for driving a system during soundcheck. The 31-band third-octave RTA runs at 24 fps with peak hold, and the built-in feedback finder names the ringing frequency and tells you the exact cut to make. A soundcheck library gives per-source starting points — high-pass corner, EQ moves with the reasoning behind each, gate and compressor values, and the combined curve. For deeper work, OCTAV includes a Chladni plate cymatics simulation you can drive with any frequency and export in 4K, along with ear-training games, a hearing check, and an instrument frequency map. The SPL meter, tuner and tone generator are free and permanently ungated. There is no account, no login, no analytics, no tracking, and no data collection of any kind — everything runs on-device, with optional private iCloud sync that stays off unless you turn it on. The interface is a dark instrument panel, with a Show Mode amber palette for working dark venues. OCTAV PRO — WHAT IT COSTS AND WHAT IT UNLOCKS The 31-band RTA and feedback finder, drum lug matching, 4K cymatics export, Show Mode, the soundcheck library and multiple saved shows require OCTAV Pro, an auto-renewing subscription: $8.79 per month, or $39.99 per year with a 3-day free trial. Payment is charged to your Apple ID at confirmation of purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period, and you can manage or cancel it at any time in your Apple ID settings. Download OCTAV and put real instrumentation in your pocket. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://skeptical.agency/privacy-policy ## Key features - Calibrated SPL meter with A/C/Z weighting - 31-band RTA with feedback finder - Chromatic and drum tuner - Tone and noise generator - NIOSH noise-dose clock - Chladni plate cymatics simulation ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | OCTAV Pro Annual | $39.99 | per year | | OCTAV Pro Monthly | $8.79 | per month | ## Is OCTAV safe? Not enough ratings yet to assess OCTAV. ## Is OCTAV legit? OCTAV — SPL Meter, RTA, Tuner has limited verification signals. The AppsHunter Legitimacy Score for OCTAV is 58 out of 100 points across 7 verification signals from App Store and developer data. ## Frequently asked questions about OCTAV ### What is OCTAV? OCTAV is a comprehensive audio analysis application designed for sound engineers. It includes a calibrated SPL meter, a 31-band RTA, chromatic and drum tuners, and tone/noise generators, all running locally on your device. ### What features are free in OCTAV? The SPL meter, chromatic tuner, and tone/noise generator are permanently free and unlocked. These core functionalities are available without any paywall, ensuring essential tools are accessible to all users. ### What does OCTAV Pro unlock? OCTAV Pro unlocks advanced features such as the 31-band RTA with feedback finder, drum lug matching, 4K cymatics export, Show Mode, the soundcheck library, and multiple saved shows. These professional-grade tools are essential for in-depth audio work. ### How much does OCTAV Pro cost? OCTAV Pro is available as an auto-renewing subscription at $8.79 per month or $39.99 per year. A 3-day free trial is offered for the annual plan, allowing you to experience the pro features before committing. ### How do I cancel my OCTAV Pro subscription? You can manage or cancel your OCTAV Pro subscription at any time through your Apple ID settings. Cancellation must be done at least 24 hours before the end of the current subscription period to avoid further charges. ### Does OCTAV collect user data? No, OCTAV is designed with privacy in mind. There is no account, login, analytics, or tracking; all processing runs on-device. Optional private iCloud sync is available but remains off unless explicitly enabled by the user. ### What devices does OCTAV support? OCTAV is supported on iPhone and iPad devices. Its interface is designed as a dark instrument panel, with an optional amber palette for working in low-light venues. ### How often is OCTAV updated? OCTAV was last updated on August 25, 2026, with version 1.0. While this indicates a recent release, future update frequency is not specified in the provided data. ## Version history (last 3 releases) ### 1.1.1 — 2026-10-15 No feature changes in this update — this build keeps OCTAV ready for the iPhone Duo, with layouts that follow the open or folded screen. The SPL meter, tuners and tone generator remain free, always. ### 1.1 — 2026-10-14 Shared octav:// links now open the tool they name — meter, analyser, tuner, drums, tone, cymatics or rig. Full-screen plots and the analyser hold landscape correctly on foldable iPhones, and layouts follow the open or folded state of the iPhone Duo. The SPL meter, tuners and tone generator remain free, always. ### 1.0 — 2026-08-25 No release notes. ## Apps similar to OCTAV | App | Rating | Price | Category | | --- | --- | --- | --- | | [WOW DB Meter & RTA](https://appshunter.io/ios/app/wow-db-meter-and-rta/id6817171749) | — | Free | Utilities | | [Ripple Sound Meter](https://appshunter.io/ios/app/ripple-sound-meter/id6780728786) | 1.0 (1) | Free | Utilities | | [fieldtape](https://appshunter.io/ios/app/fieldtape/id6756245481) | — | Free | Utilities | | [Scroll Volume Remote](https://appshunter.io/ios/app/scroll-volume-remote/id6774949988) | — | Free | Utilities | | [DriveRec: Front & Rear Dashcam](https://appshunter.io/ios/app/driverec-front-and-rear-dashcam/id6782297128) | — | Free | Utilities | | [Sounn VR Audio Analyzer](https://appshunter.io/ios/app/sounn-vr-audio-analyzer/id6766016030) | — | Free | Utilities | ## Related topics [octave rta](https://appshunter.io/ios/topics/octave-rta) --- *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 2026-10-24.*