# Round Trip Latency Meter vs variStretch

The clearest difference is rating: variStretch at 5.0 against Round Trip Latency Meter's 1.0. variStretch also leads on update cadence (every 7 months vs every 31 months) and price ($5.99 vs $9.99). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Round Trip Latency Meter costs $9.99 and variStretch $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

variStretch holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Round Trip Latency Meter ships an update every 31 months, variStretch every 7 months. The most recent releases landed on October 24, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Round Trip Latency Meter | variStretch |
| --- | --- | --- |
| Price | $9.99 | **$5.99** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/round-trip-latency-meter/id1427507645/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/varistretch/id6744925479/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 31 months | **Every 7 months** |
| Monetization | Paid | Paid |
| Size | 4 MB | 15 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ONYX Apps](https://appshunter.io/developer/356553882) | [Satoshi Kajii](https://appshunter.io/developer/1777441634) |

## 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


### variStretch

[App page](https://appshunter.io/ios/app/varistretch/id6744925479)

This app allows real-time audio speed manipulation without altering pitch. It offers three distinct playback modes and adjustable buffer settings for precise control over sound processing.

**Highlights:** Real-time speed adjustment (0.5-2.0x), Tape mode (speed & pitch change), Phase Vocoder mode (speed only), Adjustable buffer size, Buffer clear function, AUv3 host compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Round Trip Latency Meter free?

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

### Is variStretch free?

variStretch costs $5.99, with no in-app purchases.

### Which has better reviews, Round Trip Latency Meter or variStretch?

variStretch is rated higher. Round Trip Latency Meter averages 1.0 out of 5 from 1 ratings, while variStretch averages 5.0 from 1 ratings.

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

Neither Round Trip Latency Meter nor variStretch shows ads.

### Which is updated more often, Round Trip Latency Meter or variStretch?

Round Trip Latency Meter ships an update every 31 months, and variStretch every 7 months. Most recently, Round Trip Latency Meter was updated on October 24, 2026 and variStretch on October 18, 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.*