# Three9x vs OCTAV

The clearest difference is in-app purchases: Three9x at none against OCTAV's 2. Three9x also leads on iOS requirement (15.6 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. OCTAV sells 2 in-app purchases, starting at $8.79 per month. Three9x asks for nothing beyond the download.

Three9x ships an update every 5 weeks, OCTAV every 4 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Three9x | OCTAV |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/octav-spl-meter-rta-tuner/id6803230381/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 weeks** |
| Monetization | — | Freemium |
| Size | 496 MB | 12 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [THREE9X (SMC-PRIVATE) LIMITED](https://appshunter.io/developer/6782750724) | [Skeptical LLC (Company/Organization)](https://appshunter.io/developer/6803230383) |

## What reviewers say

### Three9x

[App page](https://appshunter.io/ios/app/three9x/id6782750722)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### OCTAV

[App page](https://appshunter.io/ios/app/octav-spl-meter-rta-tuner/id6803230381)

This app provides a suite of audio analysis tools for sound engineers, including a calibrated SPL meter, RTA, and tuners. It offers features for live sound work, instrument tuning, and system checks, with advanced functions available via subscription.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OCTAV Pro Monthly | $8.79 | per month |
| OCTAV Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is Three9x free?

Three9x is free to download, with no in-app purchases.

### Is OCTAV free?

OCTAV is free to download, with in-app purchases available.

### Do Three9x or OCTAV have ads?

Neither Three9x nor OCTAV shows ads.

### Which is updated more often, Three9x or OCTAV?

Three9x ships an update every 5 weeks, and OCTAV every 4 weeks. Most recently, Three9x was updated on October 25, 2026 and OCTAV on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*