# Interval Voice Clock vs Twin Calc

The clearest difference is price: Twin Calc at Free against Interval Voice Clock's $1.99. Interval Voice Clock's advantage is in-app purchases (none vs 1) and device support (4 vs 1). On ads and iOS requirement there is nothing between them.

Twin Calc is free to download; Interval Voice Clock costs $1.99 up front. Twin Calc sells 1 one-off in-app purchase. Interval Voice Clock asks for nothing beyond the download.

## The numbers

| Metric | Interval Voice Clock | Twin Calc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/interval-voice-clock/id6476801545/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Paid | — |
| Size | 32 MB | 45 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Okamoto](https://appshunter.io/developer/418850607) | [Hiroki Sugiyama](https://appshunter.io/developer/6778858327) |

## What reviewers say

### Interval Voice Clock

[App page](https://appshunter.io/ios/app/interval-voice-clock/id6476801545)

This app announces the current time at customizable intervals, allowing for hands-free time checks. It offers adjustable volume, voice options, and background playback, functioning entirely offline.

**Highlights:** Customizable announcement intervals, Adjustable announcement volume, Choice of male or female voice, Background playback support, Offline functionality, Multiple announcement types

**Features:** Vision Pro support

**In-app purchases:** none


### Twin Calc

[App page](https://appshunter.io/ios/app/twin-calc-two-calculators/id6807615879)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO | $3.99 | one-time |


## Frequently asked questions

### Is Interval Voice Clock free?

Interval Voice Clock costs $1.99, with no in-app purchases.

### Is Twin Calc free?

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

### Do Interval Voice Clock or Twin Calc have ads?

Neither Interval Voice Clock nor Twin Calc 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.*