# TheoMeter vs OCTAV

The clearest difference is in-app purchases: TheoMeter at none against OCTAV's 2. On price, ads, device support and iOS requirement there is nothing between them.

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

## The numbers

| Metric | TheoMeter | 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 4 weeks |
| Monetization | — | Freemium |
| Size | 2 MB | 12 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Frankie Wellman](https://appshunter.io/developer/6780719441) | [Skeptical LLC (Company/Organization)](https://appshunter.io/developer/6803230383) |

## What reviewers say

### TheoMeter

[App page](https://appshunter.io/ios/app/theometer/id6790203603)

**Features:** macOS Compatibility

**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 TheoMeter free?

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

### Is OCTAV free?

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

### Do TheoMeter or OCTAV have ads?

Neither TheoMeter nor OCTAV shows ads.

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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.*