# PhaseChecker vs DTS Gas Guru

The clearest difference is review sentiment: DTS Gas Guru at 100% against PhaseChecker's 16%. DTS Gas Guru also leads on update cadence (weekly vs every 43 months). PhaseChecker's advantage is price ($0.99 vs $4.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

PhaseChecker costs $0.99 and DTS Gas Guru $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PhaseChecker ships an update every 43 months, DTS Gas Guru weekly. The most recent releases landed on October 26, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | PhaseChecker | DTS Gas Guru |
| --- | --- | --- |
| Price | **$0.99** | $4.99 |
| Rating | **[2.0 (3 ratings)](https://appshunter.io/ios/app/phasechecker/id1160400348/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 15.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 43 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 1 MB | 5 MB |
| Requires iOS | **14.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rick Peacock](https://appshunter.io/developer/286052385) | [William Goodman](https://appshunter.io/developer/1887704117) |

## What reviewers say

### PhaseChecker

[App page](https://appshunter.io/ios/app/phasechecker/id1160400348)

This utility app tests your sound system to ensure speakers are correctly wired and in-phase. It offers manual and automatic modes, with advanced waveform analysis for precise setup. Proper phasing is crucial for optimal bass response and stereo imaging.

**Highlights:** Speaker phase and polarity testing, Manual and automatic test modes, Microphone-based analysis, Waveform view for advanced users, In-app help and guidance, Audio output connection

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

**In-app purchases:** none


### DTS Gas Guru

[App page](https://appshunter.io/ios/app/dts-gas-guru/id6761082629)

This professional technical diving tool provides fast and accurate calculations for dive planning, gas analysis, and safe operating limits. It's designed for CCR and open circuit divers, offering essential features in a clean interface for confident underwater decisions.

**Highlights:** MOD, END, EAD calculations, Best Mix calculator, Gas density with temperature adjustment, Gas mixing with adjustable O₂ purity, CCR diluent analysis, Trimix and Nitrox support

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

**In-app purchases:** none


## Frequently asked questions

### Is PhaseChecker free?

PhaseChecker costs $0.99, with no in-app purchases.

### Is DTS Gas Guru free?

DTS Gas Guru costs $4.99, with no in-app purchases.

### Do PhaseChecker or DTS Gas Guru have ads?

Neither PhaseChecker nor DTS Gas Guru shows ads.

### Which is updated more often, PhaseChecker or DTS Gas Guru?

PhaseChecker ships an update every 43 months, and DTS Gas Guru weekly. Most recently, PhaseChecker was updated on October 26, 2026 and DTS Gas Guru on October 21, 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.*