# Round Trip Latency Meter vs D

The clearest difference is price: D at Free against Round Trip Latency Meter's $9.99. D also leads on iOS requirement (16.0 vs 18.0). Round Trip Latency Meter's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

D is free to download; Round Trip Latency Meter costs $9.99 up front. D sells 1 one-off in-app purchase. Round Trip Latency Meter asks for nothing beyond the download.

## The numbers

| Metric | Round Trip Latency Meter | D |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/round-trip-latency-meter/id1427507645/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 31 months | — |
| Monetization | Paid | — |
| Size | 4 MB | 28 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ONYX Apps](https://appshunter.io/developer/356553882) | [Shoma Kondo](https://appshunter.io/developer/1884832972) |

## What reviewers say

### Round Trip Latency Meter

[App page](https://appshunter.io/ios/app/round-trip-latency-meter/id1427507645)

This app measures the real-world round trip latency of an iOS audio system. It plays test tones and records their return to calculate latency, requiring a loopback cable connection.

**Highlights:** Measures real-world round trip audio latency, Plays test tones, Records returning tones, Requires loopback cable connection, Tests iOS audio systems

**In-app purchases:** none


### D

[App page](https://appshunter.io/ios/app/d-chorus/id6761195373)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| D-Chorus Full Version | $4.99 | one-time |


## Frequently asked questions

### Is Round Trip Latency Meter free?

Round Trip Latency Meter costs $9.99, with no in-app purchases.

### Is D free?

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

### Do Round Trip Latency Meter or D have ads?

Neither Round Trip Latency Meter nor D 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.*